U.S. patent application number 11/461723 was filed with the patent office on 2007-02-22 for energy absorptive/moisture resistive underlayment formed using recycled materials and a hard flooring system incorporating the same.
This patent application is currently assigned to L&P Property Management Company. Invention is credited to Robert L. Ambrose, Jr., Martin Lovato, Norman Manning.
Application Number | 20070039268 11/461723 |
Document ID | / |
Family ID | 46325824 |
Filed Date | 2007-02-22 |
United States Patent
Application |
20070039268 |
Kind Code |
A1 |
Ambrose, Jr.; Robert L. ; et
al. |
February 22, 2007 |
Energy Absorptive/Moisture Resistive Underlayment Formed using
Recycled Materials and a Hard Flooring System Incorporating the
Same
Abstract
A recycled energy absorptive/moisture resistive underlayment
includes a recycled energy absorbing layer comprised of either a
nonwoven fiber batt formed from shoddy fibers or a foam pad formed
from bonded foam. To protect the recycled energy absorbing layer
from moisture, a moisture barrier is laminated on either one or
preferably both side surfaces of the recycled energy absorbing
layer. The moisture barrier laminated on a lower side surface of
the recycled energy absorbing layer has a projecting flap which
projects from first and second edge surfaces of the recycled energy
absorbing layer to which the moisture barrier is laminated to the
lower side surface thereof. The projecting flap enhances protection
of the recycled energy absorbing layer from moisture by preventing
moisture from migrating through seams and/or other exposed portions
of the recycled energy absorbing layer.
Inventors: |
Ambrose, Jr.; Robert L.;
(Woodridge, IL) ; Lovato; Martin; (Cape Coral,
FL) ; Manning; Norman; (Hendersonville, TN) |
Correspondence
Address: |
CONLEY ROSE, P.C.
5700 GRANITE PARKWAY, SUITE 330
PLANO
TX
75024
US
|
Assignee: |
L&P Property Management
Company
South Gate
CA
|
Family ID: |
46325824 |
Appl. No.: |
11/461723 |
Filed: |
August 1, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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|
11291633 |
Dec 1, 2005 |
|
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11461723 |
Aug 1, 2006 |
|
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60632315 |
Dec 1, 2004 |
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Current U.S.
Class: |
52/403.1 |
Current CPC
Class: |
D04H 1/48 20130101; B32B
2260/021 20130101; B32B 2260/046 20130101; E04F 15/22 20130101;
E04F 15/18 20130101; B32B 2307/7246 20130101; B32B 5/245 20130101;
B32B 2266/08 20130101; E04C 2/16 20130101; B32B 5/02 20130101; B32B
2471/00 20130101; E04F 15/182 20130101; E04F 15/186 20130101; B32B
2307/102 20130101; B32B 5/022 20130101; B32B 2307/7265 20130101;
E04F 2290/044 20130101; D04H 1/42 20130101; B32B 27/12 20130101;
E04F 15/04 20130101 |
Class at
Publication: |
052/403.1 |
International
Class: |
E04F 15/22 20060101
E04F015/22 |
Claims
1. A flooring underlayment configured for installation between hard
flooring and a subfloor, said flooring underlayment comprising: an
energy absorbing layer formed from a recycled material; and a
moisture barrier affixed to a first side surface of said energy
absorbing layer; wherein said energy absorbing layer absorbs
acoustic energy produced by said hard flooring in response to an
application of mechanical energy thereto.
2. The flooring underlayment of claim 1, wherein said energy
absorbing layer is a nonwoven fiber batt.
3. The flooring underlayment of claim 2, wherein said nonwoven
fiber batt is formed from shoddy fiber.
4. The flooring underlayment of claim 1, wherein said energy
absorbing layer is a foam pad.
5. The flooring underlayment of claim 4, wherein said foam pad is
formed from bonded foam.
6. The flooring underlayment of claim 1, wherein said moisture
barrier further comprises a moisture impermeable film laminated to
said first side surface of said energy absorbing layer.
7. The flooring underlayment of claim 6, wherein: said first
moisture barrier engages said subfloor; said flooring underlayment
further comprises a second moisture barrier laminated onto a second
side surface of said energy absorbing layer; and said second
moisture barrier engages said hard flooring.
8. The flooring underlayment of claim 7, wherein said energy
absorbing layer is a nonwoven fiber batt formed from shoddy
fibers.
9. The flooring underlayment of claim 7, wherein said energy
absorbing layer is a foam pad formed from bonded foam.
10. The flooring underlayment of claim 1, wherein said first
moisture barrier attached to said first side surface of said energy
absorbing layer is formed from a closed cell foam.
11. The flooring underlayment of claim 10, wherein: said first
moisture barrier engages said subfloor; said underlayment further
comprises a second moisture barrier attached to a second side
surface of said energy absorbing layer and formed from a closed
cell foam; and said second moisture barrier engaging said hard
flooring.
12. The flooring underlayment of claim 11, wherein said energy
absorbing layer is a nonwoven fiber batt formed from shoddy
fibers.
13. The flooring underlayment of claim 11, wherein said energy
absorbing layer is a foam pad formed from bonded foam.
14. A flooring underlayment configured for installation between
hard flooring and a subfloor, said flooring underlayment
comprising: an energy absorbing layer formed from a recycled
material, said energy absorbing layer having a first side surface,
a second side surface and a plurality of edge surfaces; a first
moisture barrier for engaging a subfloor, said first moisture
barrier laminated to said first side surface of said energy
absorbing layer, said first moisture barrier having at least one
edge surface laying flush with a corresponding one of said
plurality of edge surface of said energy absorbing layer and at
least one edge surface projecting past a corresponding one of said
plurality of edge surfaces of said energy absorbing layer; and a
second moisture barrier for engaging hard flooring, said second
moisture barrier laminated to said second side surface of said
energy absorbing layer, said second moisture barrier having a
plurality of edge surfaces, each of which corresponds to and lays
flush with one of said plurality of edge surfaces of said energy
absorbing layer; wherein said energy absorbing layer absorbs
acoustic energy produced by said hard flooring in response to an
application of mechanical energy thereto.
15. The flooring underlayment of claim 14, wherein said energy
absorbing layer is a nonwoven fiber batt formed from shoddy
fibers.
16. The flooring underlayment of claim 14, wherein said energy
absorbing layer is a foam pad formed from bonded foam.
17. A hard flooring system configured for installation in a space
defined by a subfloor, a first wall and a second wall, said hard
flooring system comprising: a first energy absorptive/moisture
resistive underlayment section; a second energy absorptive/moisture
resistive underlayment section; a hard flooring; each of said first
and second energy absorptive/moisture resistive underlayment
sections comprising: an energy absorbing layer formed from a
recycled material, said energy absorbing layer having a first side
surface, a second side surface and a plurality of edge surfaces; a
first moisture barrier for engaging a subfloor, said first moisture
barrier laminated to said first side surface of said energy
absorbing layer, said first moisture barrier having at least one
edge surface laying flush with a corresponding one of said
plurality of edge surface of said energy absorbing layer and at
least one edge surface projecting past a corresponding one of said
plurality of edge surfaces of said energy absorbing layer; and a
second moisture barrier engaging said hard flooring, said second
moisture barrier laminated to said second side surface of said
energy absorbing layer, said second moisture barrier having a
plurality of edge surfaces, each of which corresponds to and lays
flush with one of said plurality of edge surfaces of said energy
absorbing layer; said projecting edge surface of said first
moisture barrier laminated to said energy absorbing layer of said
first energy absorptive/moisture resistive underlayment section
engaging a portion of said first wall; said projecting edge surface
of said first moisture barrier laminated to said energy absorbing
layer of said second energy absorptive/moisture resistive
underlayment positioned underneath a portion of said first moisture
barrier laminated to said energy absorbing layer of said first
energy absorptive/moisture resistive underlayment section; and a
moisture resistive section engaging said second wall and an edge
surface of said energy absorbing layer of said second energy
absorptive/moisture resistive underlayment section which abuts said
second wall.
18. The hard flooring system of claim 17, wherein said moisture
resistive section extends underneath a portion of said first
moisture barrier laminated to said energy absorbing layer of said
second energy absorptive/moisture resistive underlayment
section.
19. The hard flooring system of claim 18, wherein said energy
absorbing layer of each of said first and second energy
absorptive/moisture resistive underlayment sections is a nonwoven
fiber batt formed from shoddy fibers.
20. The hard flooring system of claim 18, wherein said energy
absorbing layer of each of said first and second energy
absorptive/moisture resistive underlayment sections is a foam pad
formed from bonded foam.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation-In-Part (C-I-P) of U.S.
patent application Ser. No. 11/291,633 filed Dec. 1, 2005, which,
in turn, claims priority from U.S. Provisional Patent Application
Ser. No. 60/632,315 filed Dec. 1, 2004, both of which are assigned
to the Assignee of the present application and hereby incorporated
by reference as if reproduced in their entirety.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not applicable.
REFERENCE TO A MICROFICHE APPENDIX
[0003] Not applicable.
TECHNICAL FIELD
[0004] The present disclosure relates to recycled underlayments
suitable for use with hard flooring and, more particularly, to an
energy absorptive/moisture resistive underlayment formed using
recycled materials and suitable for incorporation into a hard
flooring system.
BACKGROUND
[0005] A subfloor is either a slab of concrete or one or more
sheets of plywood supported by a combination of joists, beams,
posts and, in multiple-story buildings, bearing walls while a
flooring system encompasses all of the various materials, layers
and the like which are installed above the subfloor. In one sense,
a flooring system is comprised of a flooring and an underlayment
located between the subfloor and the flooring. Most flooring used
in structures may be characterized as either a "soft" flooring or a
"hard" flooring. For example, carpeting is a common soft flooring
while wood is an equally common hard flooring. As its name
suggests, soft flooring is typically soft to the touch, quiet
underfoot and tends to yield upon application of a force thereto.
Conversely, hard flooring tends to be hard to the touch and, as a
result, is durable and easy to maintain. However, hard flooring
also tends to be relatively noisy, cold, and hard underfoot.
[0006] Most hard flooring systems, particularly those which include
wood and/or laminate flooring, include an underlayment which serves
as a moisture barrier, an energy absorber and a leveler for the
hard flooring. When used in a hard flooring system, the moisture
barrier will prevent the migration of moisture from the subfloor
into the hard flooring. As a result, whether or not an underlayment
is capable of functioning as a moisture barrier is often an
important consideration when selecting an underlayment for use with
a hard flooring system. This is particularly true if the hard
flooring system is to cover a concrete subfloor as moisture
frequently seeps through the concrete subfloor and, in the absence
of a moisture barrier, into the wood or laminate flooring where it
causes the wood flooring to warp or the laminate flooring to
delaminate. Likewise, energy absorption is often an important
consideration when selecting an underlayment for use with a hard
flooring system because such an underlayment would absorb some of
the sound or "echo" created by a person walking on the hard
flooring. As a result, the hard flooring would be quieter and,
therefore, more appealing to those concerned with the noise
typically generated by hard flooring. Finally, by smoothing high
points (peaks), low points (valleys), and other irregularities in a
subfloor, an underlayment can help ensure that the relatively
inflexible hard flooring rests on a more level surface.
[0007] A wide variety of underlayments are used in conjunction with
hard flooring. For example, a thin, continuous film of a polymeric
material, for example, polyethylene or vinyl, may be installed over
the subfloor to provide a moisture barrier for the hard flooring.
Oftentimes, a polymeric open cell foam layer is positioned over the
polymer film to provide a degree of cushioning to the hard flooring
placed above it. Variously, the polymer film and open cell foam
layer may be laminated to one another or may be discrete components
installed one over the other. Alternatively, a solid sheet of
polymer having some cushioning characteristics, for example, a
slightly polymerized vinyl chloride polymer, can function as both a
moisture barrier and a cushion between the subfloor and the hard
flooring. Another suitable underlayment is a laminate composite
formed of a moisture impervious vinyl, polyethylene, or polyester
film attached to latex or vinyl foam. Other underlayments used with
hard flooring include nonwoven fiber batts of polyester, nylon, or
polypropylene with a moisture barrier attached to one side of the
fiber batt.
[0008] One of the goals of all flooring manufacturers is to reduce
the time and complexity of installing the flooring. While this goal
is important for those types of flooring, for example, carpeting,
installed by professional installers, it is a particularly
important consideration for those floorings, for example, a
laminate or other type of hard flooring, to be installed by
consumers as consumers will often base their purchase decisions on
the complexity of the installation process, the length of time
required to install the hard flooring and/or the price of the hard
flooring. These consumer needs have led to an increase in the
number of hard flooring systems that have tongue-and-groove,
click-together, or other connection mechanisms on a plurality of
their edges so that the hard flooring is quick and easy to install.
However, with all of these advances in hard flooring installation,
the consumer is still required to install an underlayment in the
conventional manner, which often includes laying down sheets of the
underlayment on the subfloor prior to installing the hard flooring.
Therefore, a need exists for a method of simplifying the process of
installing an underlayment for hard floorings while simultaneously
reducing the time required to install the underlayment.
[0009] One of the ongoing concerns of many underlayment
manufacturers is the need to reduce manufacturing costs. Lowered
manufacturing costs result in lower product costs, which, in turn,
make the final product more appealing to the consumers.
Underlayment consumers, particularly large retail outlets and
flooring installers, are constantly seeking the lowest price on
flooring underlayment and frequently change suppliers in order to
save a few cents per square foot of underlayment. Thus, it is in
the manufacturers' best interest to produce flooring underlayment
for the lowest possible price. As the cost of upgrading
manufacturing equipment to improve efficiency can be prohibitive,
most manufacturers seek to lower production costs by using less
expensive materials to manufacture the underlayment. Consequently,
what is needed is a flooring underlayment material that is less
expensive than the existing flooring underlayment material, thereby
allowing manufacturers to produce and sell a flooring underlayment
that is less expensive than existing flooring underlayment.
[0010] Another ongoing concern for many manufacturers is the
consumer's perception of the manufacturer. Manufacturers who use
recycled materials to manufacture their product are perceived as
environmentally friendly or "green", a trait preferred by consumers
who are environmentally conscious. Consumers who are
environmentally conscious are willing to pay a premium for goods
that contain recycled materials. Even those environmentally
conscious consumers who are unwilling to pay a premium for goods
that contain recycled materials will, if given the opportunity of
selecting between two otherwise equal products, be more likely to
select the product containing recycled materials. Typically,
recycled products are partially or entirely made from previously
used or waste materials. If the cost of processing the previously
used or waste material to render it suitable for re-use is less
than the cost of purchasing new material, a recycled product can be
less expensive than a product wholly made from new materials.
Because recycled materials are both cost-effective and
consumer-preferable, a need exists for a flooring underlayment that
utilizes recycled materials.
SUMMARY
[0011] In one embodiment, disclosed herein is a flooring
underlayment configured for installation between hard flooring and
a subfloor. The flooring underlayment is comprised of an energy
absorbing layer formed from a recycled material and a first
moisture barrier affixed to a first side surface of said energy
absorbing layer. When mechanical energy is applied to the hard
flooring, the energy absorbing layer absorbs at least a portion of
the acoustic energy produced by the hard flooring. In various
aspects thereof, the energy absorbing layer is a nonwoven fiber
batt formed of recycled material, a nonwoven fiber batt formed from
shoddy fiber, a foam pad formed from recycled material or a foam
pad formed from bonded foam.
[0012] In further aspects thereof, the first moisture barrier may
be a moisture impermeable film laminated to the first side surface
of the energy absorbing layer or a closed cell foam attached to the
first side surface of the energy absorbing layer. In still further
aspects thereof, the flooring underlayment may further include a
second moisture barrier laminated onto a second side surface of the
energy absorbing layer. In this aspect, the first moisture barrier
engages the subfloor while the second moisture barrier engages the
hard flooring. As before, in various further aspects thereof, the
energy absorbing layer may be a nonwoven fiber batt formed from
shoddy fibers or a foam pad formed from bonded foam. In the
alternative, the first and/or second moisture barriers may instead
be formed of a closed cell foam.
[0013] In another embodiment, a flooring underlayment configured
for installation between hard flooring and a subfloor is disclosed.
The flooring underlayment is comprised of an energy absorbing layer
formed from a recycled material, a first moisture barrier for
engaging a subfloor and a second moisture barrier for engaging hard
flooring. The energy absorbing layer includes a first side surface,
a second side surface and a plurality of edge surfaces. The first
moisture barrier is laminated to the first side surface of the
energy absorbing layer and includes at least one edge surface
laying flush with a corresponding one of the edge surfaces of the
energy absorbing layer and at least one edge surface projecting
past a corresponding one of the edge surfaces of the energy
absorbing layer. The second moisture barrier is laminated to the
second side surface of the energy absorbing layer and includes
plural edge surfaces, each of which corresponds to and lays flush
with one of the edge surfaces of the energy absorbing layer. When
mechanical energy is applied to the hard flooring, the energy
absorbing layer absorbs at least a portion of the acoustic energy
produced by the hard flooring. In various aspects thereof, the
energy absorbing layer is a nonwoven fiber batt formed from shoddy
fiber or a foam pad formed from bonded foam.
[0014] In still another embodiment, disclosed herein is a hard
flooring system configured for installation in a space defined by a
subfloor, a first wall and a second wall. The hard flooring system
is comprise of a first energy absorptive/moisture resistive
underlayment section, a second energy absorptive/moisture resistive
underlayment section, a hard flooring and a moisture resistive
section. In turn, each of the first and second energy
absorptive/moisture resistive underlayment sections is comprised of
an energy absorbing layer formed from a recycled material, a first
moisture barrier for engaging a subfloor and a second moisture
barrier engaging the hard flooring. The first moisture barrier is
laminated to a first side surface of the energy absorbing layer and
includes at least one edge surface laying flush with a
corresponding one of the edge surfaces of the energy absorbing
layer and at least one edge surface projecting past a corresponding
one of the edge surfaces of the energy absorbing layer. The second
moisture barrier is laminated to a second side surface of the
energy absorbing layer and includes plural edge surfaces, each of
which lays flush with one of the plurality of edge surfaces of the
energy absorbing layer.
[0015] As further disclosed herein, the projecting edge surface of
the first moisture barrier laminated to the energy absorbing layer
of the first energy absorptive/moisture resistive underlayment
section engages a portion of the first wall while the projecting
edge surface of the first moisture barrier laminated to the energy
absorbing layer of the second energy absorptive/moisture resistive
underlayment is positioned underneath a portion of the first
moisture barrier laminated to the energy absorbing layer of the
first energy absorptive/moisture resistive underlayment section.
Finally, the moisture resistive section engages the second wall and
an edge surface of the energy absorbing layer of the second energy
absorptive/moisture resistive underlayment section which abuts the
second wall.
[0016] In one aspect thereof, the moisture resistive section
extends underneath a portion of the first moisture barrier
laminated to the energy absorbing layer of the second energy
absorptive/moisture resistive underlayment section. In others, the
energy absorbing layer is a nonwoven fiber batt formed from shoddy
fiber or a foam pad formed from bonded foam.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] For a more complete understanding of the present invention,
and for further details and advantages thereof, reference is now
made to the accompanying drawings, in which:
[0018] FIG. 1 is a perspective view of an energy
absorptive/moisture resistive underlayment formed using recycled
materials;
[0019] FIG. 2A is a perspective view of a hard flooring system
which incorporates an energy absorptive/moisture resistive
underlayment formed using recycled materials;
[0020] FIG. 2B is a partially cut-away, cross-sectional view of the
energy absorptive/moisture resistive underlayment of FIG. 2A;
[0021] FIG. 3 is a perspective view of an alternate embodiment of
the energy absorptive/moisture resistive underlayment of FIG. 1 or
FIG. 2;
[0022] FIG. 4 is a block diagram of a first method of manufacturing
an energy absorptive/moisture resistive underlayment using recycled
materials;
[0023] FIG. 5 is a plan view of an apparatus for manufacturing an
energy absorptive/moisture resistive underlayment in accordance
with the method of FIG. 4;
[0024] FIG. 6A is a side view of a first thermal bonding apparatus
suitable for use in manufacturing a recycled energy
absorptive/moisture resistive underlayment in accordance with the
method of FIG. 4;
[0025] FIG. 6B is a side view of a second, alternative, thermal
bonding apparatus suitable for use in manufacturing a recycled
energy absorptive/moisture resistive underlayment in accordance
with the method of FIG. 4;
[0026] FIG. 7 is a block diagram of a second method of
manufacturing an energy absorptive/moisture resistive underlayment
using recycled materials;
[0027] FIG. 8 is a side view of a mixing tank suitable for use in
manufacturing a recycled energy absorptive/moisture resistive
underlayment in accordance with the method of FIG. 7;
[0028] FIG. 9 is a side view of an apparatus for forming bonded
foam suitable for use in manufacturing a recycled energy
absorptive/moisture resistive underlayment in accordance with the
method of FIG. 7;
[0029] FIG. 10 is a side view of an apparatus for forming sheets of
bonded foam suitable for use in manufacturing a recycled energy
absorptive/moisture resistive underlayment in accordance with the
method of FIG. 7;
[0030] FIG. 11 is a side view of a second, alternative, apparatus
for forming bonded foam suitable for use in manufacturing a
recycled energy absorptive/moisture resistive underlayment in
accordance with the method of FIG. 7;
[0031] FIG. 12 is a side view of an apparatus for laminating a
moisture resistive film onto an energy absorbing layer suitable for
use in manufacturing a recycled energy absorptive/moisture
resistive underlayment in accordance with the method of FIG. 4 or
the method of FIG. 7; and
[0032] FIG. 13 is a side view of an apparatus for laminating a
moisture resistive closed cell foam onto an energy absorbing layer
suitable for use in manufacturing a recycled energy
absorptive/moisture resistive underlayment in accordance with the
method of FIG. 4 or the method of FIG. 7.
DETAILED DESCRIPTION
[0033] A recycled energy absorptive/moisture resistive underlayment
50 will now be described in detail. As used herein the term
"recycled energy absorptive/moisture resistive underlayment" shall
refer to an energy absorptive/moisture resistive underlayment
formed using one or more recycled materials as a component thereof.
Thus, by definition, the recycled energy absorptive/moisture
resistive underlayment 50 is formed using one or more recycled
materials. As best seen in FIG. 1, the recycled energy
absorptive/moisture resistive underlayment 50 is comprised of a
moisture barrier 54 bonded to an energy absorbing layer 52, for
example, by laminating side surface 54b of the moisture barrier 54
onto side surface 52a of the energy absorbing layer 52. Of course,
in FIG. 1, the moisture barrier 54 has been partially pulled away
to better show the side surfaces 52a and 54b of the energy
absorbing layer 52 and the moisture barrier 54, respectively.
[0034] Uniquely, the energy absorbing layer 52 illustrated in FIG.
1 is formed from a selected type of recycled materials. Thus, in
accordance with the nomenclature set forth hereinabove, the energy
absorbing layer 52 may properly be referred to as recycled energy
absorbing layer 52. In the embodiment illustrated in FIG. 1, the
recycled energy absorbing layer 52 is a nonwoven fiber batt formed
from shoddy fibers 53 bonded together in a manner to be more fully
described below. In an alternate embodiment not shown in FIG. 1,
the recycled energy absorbing layer 52 is a foam pad formed from
recycled foam, which is commonly known in the art as bonded
foam.
[0035] Unfortunately, in the past, the term "shoddy" has been used
somewhat inconsistently. Accordingly, for purposes of the foregoing
disclosure, the term "shoddy material" shall refer to materials
that have been collected so that the fibers forming the shoddy
material may be reused. The term "shoddy fibers" shall refer to
recycled fibers, including both loose waste fibers and fibers that
have reclaimed from shoddy material. Finally, the term "shoddy
products" shall refer to products formed using shoddy fibers. For
example, if bedding material, for example, a nonwoven fiber batt,
is acquired for reuse, the nonwoven fiber batt shall be termed
"shoddy material." The polyester fibers reclaimed from the nonwoven
fiber batt for reuse shall be termed "shoddy polyester fibers."
Finally, if a recycled nonwoven fiber batt is constructed from the
shoddy polyester fiber, the recycled nonwoven fiber batt may be
termed as either a "shoddy nonwoven fiber batt" or a "nonwoven
fiber batt formed using shoddy polyester fibers."
[0036] As previously set forth, shoddy fibers is comprised of
fibers, previously used in clothing, bedding, fabric and other
natural and synthetic materials, which have been collected for
purposes of recycling the fibers thereof. Because recycled fibers
originate from multiple sources, shoddy fibers are often a blend of
a variety of types of fibers. Alternatively, the recycled fibers
may be collected from a single fiber source. If so, the shoddy
fiber would be comprised of a specific type of fiber. In one
example, the recycled fibers may be comprised of the fibers which
tends to accumulate as a unwanted by-product of a manufacturing
process, e.g., when some of the polyester fibers consumed during
the manufacture of nonwoven fiber batts for use in bedding products
are wasted, for example, when untangling a newly formed nonwoven
fiber web or trimming edges of a newly formed nonwoven fiber batt.
Similarly, some cotton fibers are wasted during yarn spinning
processes. In another example, consumer products formed from a
single type of fiber, for example, the 100% polyester fiber batts
used in some bedding materials, may be collected for recycling.
Whether comprised of a single fiber type or plural fiber types,
shoddy material is generally cleaned and shredded to form a
homogeneous blend of fibers prior to being formed into a shoddy
nonwoven fiber batt suitable for use as the recycled energy
absorbing layer 52. Further details of the process by which a
nonwoven fiber batt suitable for use as the recycled energy
absorbing layer 52 is formed will be described later with respect
to FIGS. 4, 5, 6A and 6B.
[0037] When a foam pad is employed as the recycled energy absorbing
layer 52, the foam pad is typically formed from bonded foam-foam
comprised of a plurality of recycled foam pieces bonded to one
another. The recycled foam pieces may be acquired from a variety of
sources, including manufacturing processes in which foam is wasted
during the formation of prime or bond foam pads, for example, while
trimming edges of newly formed prime foam or bond foam pads. Used
carpet pads that have been collected for recycling purposes is
another source of the recycled foam pieces used to form the bonded
foam pads. The foam pieces are preferably polyurethane foam, but
may also be other materials such as latex foam, polyvinyl chloride
(PVC) foam, or any other polymeric foam.
[0038] The moisture barrier 54 is a thin layer of material that is
attached or otherwise laminated onto the recycled energy absorbing
layer 52. As its name implies, the moisture barrier 54 is formed
from a material that is impervious to liquid moisture and moisture
vapor. Alternatively, the moisture barrier 54 may be permeable with
respect to moisture vapor, but impervious to liquid moisture. Such
moisture barriers 54 are advantageous because they discourage the
transmission of liquid moisture across the energy
absorptive/moisture resistive underlayment 50 yet allow the energy
absorptive/moisture resistive underlayment 50 to "breathe." In the
alternative, the moisture barrier 54 may be configured such that it
includes a hydrophobic side and a hydrophilic side. If so, the
moisture barrier 54 would encourage the migration of moisture in
one direction but not in the opposite direction.
[0039] The moisture barrier 54 is typically a polymeric film, such
as polyethylene or ethylene vinyl acetate (EVA) copolymer. An
example of a suitable film is 150 gauge low density polyethylene
film weighing 35 grams per square meter, available from numerous
manufacturers including The Dow Chemical Company of Midland, Mich.
and E.I. du Pont de Nemours and Company of Wilmington, Del.
Alternatively, the moisture barrier 54 may be a layer of closed
cell foam, such as a styrene butadiene rubber (SBR), latex, or PVC
foam. By definition, closed cell foam has too few interconnecting
cells to allow the transmission of bulk fluids through the foam.
The formulation of a typical closed cell foam is disclosed in U.S.
patent application Ser. No. 10/306,271 filed Nov. 27, 2002 to
Brodeur et al., entitled "Moisture Barrier and Energy Absorbing
Cushion," assigned to the Assignee of the present application and
hereby incorporated by reference as if reproduced in its entirety.
A number of other moisture barriers 54 are commercially available,
any one of which may be suitable for use with the recycled energy
absorptive/moisture resistive underlayment 50.
[0040] While the recycled energy absorptive/moisture resistive
underlayment 50 is described in conjunction with a hard flooring
system, it is fully contemplated that the recycled energy
absorptive/moisture resistive underlayment 50 can be used as an
underlayment for any type of flooring system. As used herein, the
term "flooring system" refers to any type of flooring used in
combination with an underlayment. The term "flooring" includes both
soft flooring and hard flooring. As used herein, the term "soft
flooring" refers to non-rigid flooring products such as carpets and
rugs while the term "hard flooring" refers to rigid flooring
products such as ceramic tile, linoleum, vinyl, wood flooring, and
laminate flooring. Hard floorings typically require an underlayment
with a moisture barrier that keeps moisture from migrating from the
subfloor into the hard flooring layer. Moisture in the hard
flooring is not preferred because the moisture tends to warp, rot,
or delaminate the hard flooring. As used herein, the term "laminate
flooring" describes any flooring product that contains various
layers attached or otherwise laminated together and includes
laminated pressboard, paper, wood particles, and the like. The term
"laminate flooring" also includes ceramic tile or other flooring
attached to laminated pressboard, paper, or wood particles, and the
like. Examples of laminate flooring are the products sold under the
names PERGO.RTM. by Pergo AB of Stockholm, Sweden laminate flooring
and EDGE GTL.TM. by Edge Flooring of Dalton, Ga.
[0041] It is further contemplated that the orientation of the
recycled energy absorptive/moisture resistive underlayment 50
relative to the subfloor and flooring may be varied. For example,
the recycled energy absorptive/moisture resistive underlayment 50
may be oriented such that the moisture barrier 54 is positioned
above the energy absorbing layer 52 and adjacent the hard flooring
or oriented such that the moisture barrier layer 54 is positioned
below the energy absorbing layer 52 and adjacent the subfloor. It
should be readily appreciated that the recycled energy
absorptive/moisture resistive underlayment illustrated in FIG. 1
may be used in either of the aforementioned orientation. Typically,
the orientation of the recycled energy absorptive/moisture
resistive underlayment 50 is determined during the installation or
the hard flooring system. For example, if the recycled energy
absorptive/moisture resistive underlayment 50 is oriented such that
the moisture barrier 54 faces the subfloor, the moisture barrier 54
will prevent the migration of moisture from the subfloor into the
energy absorbing layer and the hard flooring. Such an orientation
is particularly well suited for the installation of hard flooring
systems in basements and onto slab foundations directly.
Alternatively, if the recycled energy absorptive/moisture resistive
underlayment 50 is placed such that moisture barrier 54 faces the
hard flooring, the moisture barrier 54 prevents the migration of
moisture from the hard flooring into the recycled energy absorbing
layer 52. Such an orientation is particularly well suited for the
installation of hard flooring systems in upper floors. It should be
clearly understood, however, that the orientation of the moisture
barrier 54 relative to the recycled energy absorbing layer 54
within any particular recycled energy absorptive/moisture resistive
underlayment 50 and associated hard flooring system may vary from
the foregoing based upon any number of considerations unique to
that particular hard flooring system.
[0042] Rather than the recycled energy absorptive/moisture
resistive underlayment having a moisture barrier laminated on one
side of the recycled energy absorbing layer which is illustrated in
FIG. 1, it is contemplated that the recycled energy
absorptive/moisture resistive underlayment may instead be
configured such that a moisture barrier is laminated on both sides
of the recycled energy absorbing layer. Such an alternate
configuration for a recycled energy absorptive/moisture resistive
underlayment is illustrated in FIGS. 2A-B. As may now be seen, a
recycled energy absorptive/moisture resistive underlayment 50' is
comprised of a recycled energy absorbing layer 52' having a first
moisture barrier 54-1 laminated onto a first side surface 52a' of
the recycled energy absorbing layer 52' and a second moisture
barrier 54-2 Laminated onto a second side surface 52b' of the
recycled energy absorbing layer 52'. As before, the recycled energy
absorbing layer 52' is formed from a selected type of recycled
materials, typically, either a nonwoven fiber batt formed from
shoddy fibers or a foam pad formed from bonded foam. In the
embodiment illustrated in FIGS. 2A-B, however, the recycled energy
absorbing layer 52' is comprised of a foam pad formed from bonded
foam.
[0043] By being configured such that moisture barriers are
laminated on first and second side surfaces of the recycled energy
absorbing layer, it is contemplated that the recycled energy
absorptive/moisture resistive underlayment 50' illustrated in FIGS.
2A-B will enjoy the benefits of both embodiments described
hereinabove, specifically, those benefits which result from
placement of the moisture barrier between the subfloor and the
recycled energy absorbing layer and those benefits which result
from placement of the moisture barrier between the recycled energy
absorbing layer and the hard flooring. It is contemplated that the
alternate configuration illustrated in FIGS. 2A-B is particularly
desirable when the recycled energy absorbing layer 52' contains
greater amounts of absorbent materials as such materials tend to
more readily absorb moisture into the recycled energy absorbing
layer 52', thereby promoting the growth of mildew, mold, fungus,
and/or microbes. Accordingly, it is further contemplated that the
recycled energy absorptive/moisture resistive underlayment 50' may
also contain an antimicrobial additive to discourage the growth of
mildew, mold, fungus, and microbes, particularly when the recycled
energy absorbing layer 52' is formed using greater amounts of
absorbent materials. Two examples of an antimicrobial, antifungal,
or similar additives suitable for the purposes contemplated herein
are the Sanitized.TM. and Actigard.TM. product lines available from
Sanitized AG of Burgdorf, Switzerland or other antimicrobial
product line suitable for use in bonded foam products. The
incorporation of an antimicrobial, antifungal, or similar additive
to an underlayment is described in U.S. patent application Ser. No.
10/840,309 filed May 6, 2004, entitled "Anti-Microbial Carpet
Underlay and Method of Making", assigned to the Assignee of the
present application and hereby incorporated by reference as if
reproduced in its entirety.
[0044] In still another alternate embodiment not shown in the
drawings, it is further contemplated that the recycled energy
absorptive/moisture resistive underlayment can be configured
without a moisture barrier laminated onto either of the side
surfaces of the recycled energy absorbing layer. It is contemplated
that lower production costs for the recycled energy
absorptive/moisture resistive underlayment would be achieved if the
recycled energy absorbing layer were manufactured without a
moisture barrier laminated thereto. In this regard, it is noted
that the moisture barrier may be unnecessary for certain
applications in which discouraging the migration of moisture is not
of particular concern. For example, in dry climates such as the
southwest United States, moisture is not as problematic as in
coastal and other humid regions of the country. As a result, the
need for a moisture barrier is not as great in these areas. In
addition, multi-story homes may not require a moisture barrier on
the upper floors because the migration of moisture from the
subfloor is typically limited to the bottom floor of the residence.
Accordingly, the need for a moisture barrier may be less for those
underlayments to be installed on upper floors. Consequently, in
some applications, it is contemplated that the moisture barrier may
be eliminated from the manufacturing process described herein,
thereby reducing the production costs of the recycled energy
absorptive/moisture resistive underlayment and, in turn, making the
recycled energy absorptive/moisture resistive underlayment less
expensive and, as a result, more appealing to consumers.
[0045] Returning to FIG. 2A, in a still further alternative
embodiment, the recycled energy absorptive/moisture resistive
underlayment 50' can be configured to still further enhance the
moisture resistance thereof. In the embodiment illustrated in FIG.
1, the recycled energy absorptive/moisture resistive underlayment
50 is configured such that the recycled energy absorption layer 52
and the moisture barrier 54 have generally equal surface areas and
are aligned on all four edge surfaces thereof. For example, edge
surface 52c of the recycled energy absorbing layer 52 is aligned
with edge surface 54c of the moisture barrier 54. In the embodiment
illustrated in FIG. 2, however, the second moisture barrier 54-2 is
formed to include a projecting side flap 56 that results in edge
surfaces 54-2c and 54-2d of the second moisture barrier 54-2 to
extend past the corresponding edge surfaces 52c' and 52d' of the
recycled energy absorbing layer 52'. Preferably, the projecting
side flap 56 is sized such that the edge surface 54-2c of the
second moisture barrier 54-2 is about 4 inches beyond the edge
surface 52c' of the recycled energy absorbing layer 52' and the
edge surface 54-2d of the second moisture barrier 54-2 is about 4
inches beyond the edge surface 52d' of the recycled energy
absorbing layer 52'.
[0046] The advantage of configuring the second moisture barrier
54-2 to include the projecting side flap 56 is readily apparent
when one considers that an underlayment is rarely, if ever,
installed in one section. For example, the recycled energy
absorptive/moisture resistive underlayment 50' illustrated in FIG.
2A is comprised of a first section 51-1 and a second section 51-2,
each having a edge surface which abuts the edge surface of the
other. By configuring the energy absorptive/moisture resistive
underlayment 50' such that the second moisture barrier 54-2
includes the projecting side flap 56, the second, subsequently
installed, section 51-2 of the recycled energy absorptive/moisture
resistive underlayment 50' is positioned, relative to the first,
previously installed, section 51-1 of the recycled energy
absorptive/moisture resistive underlayment 50' such that a portion
of the second moisture barrier 54-2 of the second section 51-2
extends underneath a portion of the first moisture barrier 54-1 of
the first section 51-1, thereby creating an overlapping moisture
barrier at seam 53 which separates the first section 51-1 of the
recycled energy absorptive/moisture resistive underlayment 50' from
the second section 51-2 of the recycled energy absorptive/moisture
resistive underlayment 50'.
[0047] It is contemplated that an overlapping moisture barrier is
advantageous over a non-overlapping moisture barrier in that the
overlapping moisture barrier is better equipped to prevent moisture
from circumventing the moisture barrier at the seam separating two
sections of underlayment. Thus, the overlapping moisture barrier is
additional assurance that the moisture barrier will discourage the
migration of moisture from the subfloor to the hard flooring. It is
contemplated that, if the moisture barrier is laminated onto a
lower side surface of the recycled energy absorbing layer, the
weight of the recycled energy absorbing layer will be sufficient to
hold the projecting flap in place. If, however, the moisture
barrier is laminated onto an upper side surface of the recycled
energy absorbing layer, it is contemplated that tape may be used to
secure the projecting flap in place. However, regardless as to
which moisture barrier includes the projecting flap, it is further
contemplated that the subsequently installed section 51-2 of the
recycled energy absorptive/moisture resistive underlayment 50' is
secured to the previously installed section 51-1 of the recycled
energy absorptive/moisture resistive underlayment 50' using a strip
58 of tape placed over the seam 53 between the first and second
sections 51-1 and 51-2 of the recycled energy absorptive/moisture
resistive underlayment 50'.
[0048] Continuing to refer to FIG. 2A, the installation of a
flooring system 49 comprised of the recycled energy
absorptive/moisture resistive underlayment 50' and a hard flooring
60 will now be described briefly. FIG. 2A is a perspective view of
a corner of a room where the recycled energy absorptive/moisture
resistive underlayment 50' has been installed between a subfloor 62
and the hard flooring 60. As previously set forth, the recycled
energy absorptive/moisture resistive underlayment 50' may be
installed with either the moisture barrier abutting the hard
flooring 60, with the moisture barrier abutting the subfloor 62 or,
as illustrated in FIG. 2A, with a first moisture barrier 54-1
abutting the hard flooring 60 and a second moisture barrier 54-2
abutting the subfloor 62. As previously set forth, the recycled
energy absorptive/moisture resistive underlayment 50' is configured
such that the second moisture barrier 54-2 includes the projecting
flap 56. As indicated by the phantom line appearing in FIG. 2A, the
projecting flap 56 of the second moisture barrier 54-2 of the
second section 51-2 of the recycled energy absorptive/moisture
resistive underlayment 50' is covered by the second moisture
barrier 54-2 of the first section 51-1 of the recycled energy
absorptive/moisture resistive underlayment 50'.
[0049] When installing the second, subsequent, section 51-2 of the
recycled energy absorptive/moisture resistive underlayment 50', the
installer places the subsequent section 51-2 of the recycled energy
absorptive/moisture resistive underlayment 50' directly adjacent to
the first, previously installed, section 51-1 of the recycled
energy absorptive/moisture resistive underlayment 50'. If the
second moisture barrier 54-2 of the subsequently installed section
51-2 includes a projecting flap 56, the previously installed
section 51-1 is pulled up so that the projecting flap 56 may be
laid on the subfloor 62. The previously installed section 51-1 is
then placed such that the second moisture barrier 54-2 of the
previously installed section 51-1 covers the projecting flap 56 of
the second moisture barrier 54-2 of the subsequently installed
section 51-2. The previously and subsequently installed sections
51-1 and 51-2 are then secured in place with the strip 58 of tape.
After the recycled energy absorptive/moisture resistive
underlayment 50' has been installed over the subfloor 62, the hard
flooring 60 is installed on top of the recycled energy
absorptive/moisture resistive underlayment 50, thereby completing
assembly of the hard flooring system 49. Variously, the seams of
the hard flooring 60 may run parallel, perpendicular, diagonally,
or any other orientation with respect to the seams 53 of the
recycled energy absorptive/moisture resistive underlayment 50'.
[0050] In an alternative embodiment of the installation process, an
additional section of moisture barrier (not shown in FIG. 2A) may
be installed under the lower and edge surfaces of the recycled
energy absorptive/moisture resistive underlayment 50' where the
subfloor 62 meets the walls 63. By doing so, the additional section
of moisture barrier extends underneath the second moisture barrier
54-1 and up along the walls 63 of the room. If the recycled energy
absorptive/moisture resistive underlayment 50' is configured with
the projecting flap 56, the projecting flap 56 can be used to
extend up along the wall 63 by simply bending the projecting flap
56 so that it engages the wall 63. The additional section of
moisture barrier extending up along the walls 63 may be concealed
using trim (not shown) after the hard flooring 60 has been
installed over the recycled energy absorptive/moisture resistive
underlayment 50'. By configuring the hard flooring system 49 so
that the second moisture barrier extends upward along the walls 63,
the hard flooring 60 is protected from moisture migrating from the
subfloor 62 along the edge surfaces of the recycled energy
absorptive/moisture resistive underlayment 50'
[0051] The use of the projecting flaps 56 and/or the additional
section of moisture barrier to enhance the protection of the
recycled energy absorbing layer from moisture will now be more
fully described with respect to FIG. 2B. As may now be seen, the
recycled energy absorptive/moisture resistive underlayment 50' has
been installed above the subfloor 62 of a room. The recycled energy
absorptive/moisture resistive underlayment 50' is comprised of
plural underlayment sections 51-1 through 51-X which enable the
recycled energy absorptive/moisture resistive underlayment 50' to
extend from a first wall 63a of the room to a second wall 63b
thereof. Each underlayment section 51-1 through 51-X' is comprised
of a recycled energy absorbing layer 52 formed from bonded foam.
The recycled energy absorbing layer has a first side surface 52a on
which a first moisture barrier 54-1 has been laminated and a second
side surface 54a on which a second moisture barrier 54-2 has been
laminated. Each of the second moisture barriers 54-2 includes a
projecting flap 56 which extends beyond an edge surface 52c of the
recycled energy absorbing layer 52 to which the second moisture
barrier 54-2 is laminated. As a result, the projecting flaps 56 may
be easily repositioned relative to the recycled energy absorbing
layer 52 to which it is attached.
[0052] The edge surface 52c of the recycled energy absorbing layer
52 of the first underlayment section 51-1 is positioned to abut the
wall 63a. The projecting flap 56 is bent at a 90.degree. angle
relative to the subfloor 62 so that it separates the wall 63a from
the edge surface 52c of the recycled energy absorbing layer 52
which, absent the projecting flap 56, would engage the wall 63a. As
a result, the projecting flap 56 enhances the protection of the
recycled energy absorbing layer 52 of the first underlayment
section 51-1 from moisture migrating from the subfloor 62 along the
wall 63a since, absent the projecting flap 56, the edge surface 52c
of the recycled energy absorbing layer 52 would be unprotected by
any type of moisture barrier.
[0053] The edge surface 52c of the recycled energy absorbing layer
52 of the second underlayment section 51-2 is positioned to abut
the edge surface 52d of the recycled energy absorbing layer 52 of
the first underlayment section 51-1, thereby forming seam 53
separating the first and second underlayment sections 51-1 and
51-2. Here, however, the projecting flap 56 of the second moisture
barrier 54-2 of the second underlayment section 51-2 extends along
a portion of the subfloor 62 beyond the edge surface 52c of the
second underlayment section 51-2 to which the second moisture
barrier 54-2 is laminated. For that portion of the subfloor 63 for
which the second moisture barrier 54-2 of the first underlayment
section 51-1 and the projecting flap 56 of the second underlayment
section 51-2 overlap, the second moisture barrier 54-2 of the first
underlayment section 51-1 extends over the projecting flap 56 of
the second moisture barrier 54-2 of the second underlayment section
51-2. However, as the projecting flap 56 is relatively thin
compared to the first underlayment section 51-1 as a whole, no
other displacement of the first underlayment section 51-1 results
from the second moisture barrier 54-2 of the first underlayment
section 51-1 extending over the projecting flap 56 of the second
moisture barrier 54-2 of the second underlayment section 51-2
instead of the subfloor 62. By covering the seam 53 separating the
first and second underlayment sections 51-1 and 51-2, the
projecting flap 56 of the second underlayment section 51-2 enhances
the protection of the recycled energy absorbing layer 52 of both
the first and second underlayment sections 51-1 and 51-2 from
moisture migrating from the subfloor along the seam 53 between the
first and second underlayment sections 51-1 and 51-2.
[0054] The edge surface 52d of the recycled energy absorbing layer
52 of the underlayment section 51-X is positioned to abut the wall
63b. As no projecting flap extends from the second moisture barrier
54-2 laminated to recycled energy absorbing layer 52 of the
underlayment section 51-X, an additional moisture barrier 59 is
inserted between the edge surface 52d of the recycled energy
absorbing layer 52 and the wall 63b. The moisture barrier 59 is
sized to extend, along the wall 63b, from the subfloor 62 to above
the first moisture barrier 54-1 of the underlayment section 51-X
and is preferably formed of a moisture resistive material similar
to that use to form the first and second moisture barriers 54-1 and
54-2. For ease of handling and installation, however, it is
preferred that the moisture barrier 59 be somewhat thicker than the
first and second moisture barriers 54-1 and 54-2. The moisture
barrier 59 separates the wall 63b from the edge surface 52d of the
recycled energy absorbing layer 52 of the underlayment section
51-X. As a result, the moisture barrier 59 enhances the protection
of the recycled energy absorbing layer 52 of the underlayment
section 51-X from moisture migrating from the subfloor 62 along the
wall 63b since, absent the moisture barrier 59, the edge surface
52d of the recycled energy absorbing layer 52 of the underlayment
section 51-X would be unprotected by any type of moisture
barrier.
[0055] In one aspect, it is contemplated that the moisture barrier
59 be configured such that it extends along the wall 63b, bends at
a 90.degree. angle at the juncture of the wall 63b and the subfloor
62 and then extend along a portion of the subfloor 62. Such a
configuration would further enhance the protection of the recycled
energy absorbing layer 52 of the underlayment section 51-X as the
seam between the second moisture barrier 54-2 and the moisture
barrier 59 would be protected in a manner similar to that
protecting the seam 53 between the first and second underlayment
sections 51-1 and 51-2. To configure the moisture barrier 59 in
this manner, however, the moisture barrier 59 would need to be
relatively flexible so that it can bend in the aforedescribed
manner at the juncture of the wall 63b and the subfloor 62.
[0056] Referring next to FIG. 3, still another alternative
embodiment of the hard flooring system 49 may now be seen. In this
embodiment, the recycled energy absorptive/moisture resistive
underlayment 50 is fixedly secured to a lower side surface 60a of
the hard flooring 60. It is contemplated that, in many cases,
securing the recycled energy absorptive/moisture resistive
underlayment 50 to the lower side surface 60a of the hard flooring
60 is considered advantageous because it combines the installation
of the recycled energy absorptive/moisture resistive underlayment
50 onto a subfloor and the installation of the hard flooring 60
onto the recycled energy absorptive/moisture resistive underlayment
50. By utilizing the embodiment illustrated in FIG. 3, the user can
install the recycled energy absorptive/moisture resistive
underlayment 50 and the hard flooring layer 60 in substantially
less time than if the user was required to separately install the
energy absorptive/moisture resistive underlayment 50 and the hard
flooring layer 60.
[0057] As before, the recycled energy absorptive/moisture resistive
underlayment 50 is comprised of a recycled energy absorbing layer
to which a moisture barrier is laminated to either the lower side
surface, the upper side surface, both of the lower and upper side
surfaces or to neither the lower nor the upper side surfaces.
Again, as before, the recycled energy absorbing layer may be
comprised of a nonwoven fiber batt formed from shoddy fibers or a
foam pad formed from bonded foam. To enhance the protection of the
recycled energy absorbing layer from moisture migrating from the
subfloor, it is contemplated that the recycled energy
absorptive/moisture resistive underlayment may be configured such
that the second moisture barrier laminated to a lower side surface
of the recycled energy absorbing layer include one or more
projecting flaps similar in design to the projecting flaps
described with respect to FIGS. 2A-B. To further enhance the
protection of the recycled energy absorbing layer from moisture
migrating from the subfloor, it is further contemplated that the
hard flooring system 49 may be further configured to include an
additional section of moisture resistive material, again, similar
to that previously described with respect to FIGS. 2A-B.
[0058] Referring next to FIG. 4, a first method 66 for
manufacturing the energy absorptive/moisture resistive underlayment
50 will now be described in greater detail. As will be more fully
described below, the method 66 is a process in which shoddy
material is processed to yield recycled fibers for use in forming a
nonwoven fiber batt which serves as the energy absorbing layer of
the energy absorptive/moisture resistive underlayment 50. As may
now be seen, the method 66 includes providing shoddy material at
68, processing the shoddy material into recycled fibers at 70,
blending the recycled fibers at 72, forming a web from the recycled
fibers at 74, coating the web with a resin at 76, needle punching
the web at 78, compressing the web at 80, heating the web to form a
nonwoven fiber batt at 82, cooling the nonwoven fiber batt at 84,
trimming the nonwoven fiber batt at 86 and laminating a moisture
barrier onto the nonwoven fiber batt at 90 to complete formation of
the energy absorptive/moisture resistive underlayment 50. If it is
desired to attach the newly formed energy absorptive/moisture
resistive underlayment 50 to the hard flooring layer 60 in the
manner illustrated in FIG. 3, then the method 66 further comprises
further includes laminating or otherwise adhering the energy
absorptive/moisture resistive underlayment 50 to the hard flooring
60.
[0059] The method 66 will now be described in greater detail. The
method 66 commences at 68 with the acquisition of sufficient shoddy
material to form the desired energy absorbing layer 52 of the
energy absorptive/moisture resistive underlayment 50. It is
contemplated that the acquisition of shoddy material at 68 will
encompass the acquisition of previously formed nonwoven fiber
batts, including carpet underlayments which themselves are
typically formed from recycled and/or waste fibers. It is further
contemplated that the acquisition of shoddy material at 66 will
further encompass the purchase of bales of recycled fibers from
another. It is also contemplated that the acquisition of shoddy
material at 66 will further encompass the collection of waste
fibers and/or nonwoven fibers at a processing line such as
processing line 110 of FIG. 5. For example, loose fibers which
would otherwise be disposed of as waste materials may be collected
at various stations of the processing line 110 such as at
cross-lappers 116', 117' and/or 118'. Additionally, scrap materials
are produced at cutting zone 180 where selected portions of the
newly formed nonwoven fiber batt are trimmed from the edges of the
nonwoven fiber batt.
[0060] After acquiring the shoddy material to be used to form the
energy absorbing layer 52 of the energy absorptive/moisture
resistive underlayment 50 at 68, the method 66 continues with the
processing of the acquired shoddy material into recycled fibers at
70. Variously, it is contemplated that processing of the shoddy
material into recycled fibers at 70 may include shredding shoddy
material acquired in the form of nonwoven fiber batts into loose
fibers and/or cleaning loose fibers to remove contaminants
therefrom. If the recycled fibers have already been baled,
processing of the shoddy material into recycled fibers at 70 shall
also encompass the use of a bale breaker to literally break the
bale into loose fibers.
[0061] The method 66 shall now be further described with respect to
FIG. 5. As may now be seen, FIG. 5 is a schematic top plan view of
a processing line 110 suitable for constructing the energy
absorbing layer 52 of the energy absorptive/moisture resistive
underlayment 50. Thus, the processing line performs 72 through 86
of the method 66. At 72, a homogeneous blend of the recycled fibers
is produced by blending the fibers together in a fiber blender 112.
Of course, depending on the homogeneity of the recycled fibers
produced at 70 and/or the desired homogeneity of the blend of
recycled fibers to be formed into the energy absorbing layer 52,
blending of the recycled fibers at 72 of method 66 and the
corresponding use of the fiber blender 112 may be omitted.
[0062] A suitably homogeneous blend of recycled fibers is then
transported by conveyor pipes 114 from the fiber blender 112 or
other source of recycled fibers to a web forming device, in this
example, first, second and third web-forming devices 116, 117 and
118, for formation of a fiber web therefrom. Variously, the
recycled fibers transported to the web-forming devices 116, 177 and
118 are natural fibers such as cotton or wool, synthetic fibers
such as polyester or polypropylene, a mixture of different types of
natural fibers, a mixture of different types of synthetic fibers or
a mixture of one or more types of nature fibers and one or more
synthetic fibers. As disclosed herein, each of web-forming devices
116, 117 and 118 is a garnett machine. Of course, an air laying
machine, known in the trade as a Rando webber, or another suitable
type of machine can be employed as the web-forming devices 116, 117
and 118.
[0063] The garnett machines 116, 117 and 118 card the homogeneous
blend of recycled fibers into a recycled fiber web having a desired
width at 74 of the method 66. The recycled fiber web is then
transported to a cross lapper, or, as disclosed herein, first,
second and third cross-lappers 116', 117' and 118' where the
recycled fiber web is cross-lapped onto a slat conveyor 120 moving
in the machine direction. The cross-lappers 116', 117' and 118'
reciprocate back and forth in the cross direction from one side of
the conveyor 120 to the other side such that the thickness of the
recycled fiber web increases as the cross-lappers 116', 117' and
118' cause the recycled fiber web to repeatedly overlap itself,
thereby layering the recycled fiber web. The number of layers that
make up the recycled fiber web is determined by the speed of the
conveyor 120 relative to the speed at which successive layers of
the web are layered on top of each other and the number of
cross-lappers 116' 117', and 118'. Thus, the number of layers which
make up the recycled fiber web can be increased by slowing the
relative speed of the conveyor 120 relative to the speed at which
the cross-lappers 116', 117' and 118' layer the recycled fiber web
on top of itself, by increasing the number of cross-lappers 116',
117' and 118', or both. Conversely, the number of layers which make
up the recycled fiber web can be decreased by increasing the speed
of the conveyor 120 relative to the speed of at which the
cross-lappers 116', 117' and 118 layer the recycled fiber web on
top of itself, by decreasing the number of cross-lappers 116',
117', and 118', or both. As disclosed herein, it is contemplated
that the number of layers in the recycled fiber web may vary based
upon the desired characteristics of the energy absorbing layer 52
and/or the energy absorptive/moisture resistive underlayment 50. As
a result, the speed of the conveyor 120 relative to the speed at
which successive layers of the web are layered on top of one
another by the cross-lappers 116', 117' and 118' and the number of
cross-lappers 116', 117' and 118' for forming the web may vary
accordingly.
[0064] Proceeding to 76 of method 66, a heat curable resin is
applied to the recycled fiber web by a resin applicator 122. While
there are a variety of techniques suitable for applying resins onto
the web, most commonly, either a liquid resin is sprayed or a froth
resin is extruded onto the recycled fiber web. More specifically,
as the recycled fiber web moves along the conveyor 120 in the
machine direction, the liquid resin is sprayed onto the recycled
fiber web by one or more spray heads (not shown in FIG. 5) that
move in a transverse or cross direction to substantially coat the
recycled fiber web. Alternatively, the froth resin can be extruded
onto the recycled fiber web using a knife or other means. In still
another alternative, the recycled fiber web may either be fed
through or dipped into a resin bath. The recycled fiber web is then
saturated with the applied resin by crushing the resin into the
recycled fiber web using nip rollers (not shown in FIG. 5),
disposed along the transverse direction of the conveyor 122, which
apply pressure to the surface of the recycled fiber web. Finally,
in still another alternative, the resin may be crushed into the
recycled fiber web by applying vacuum pressure through the recycled
fiber web.
[0065] It is contemplated that a heat curable resin would be
suitable for the purposes disclosed herein. It is further
contemplated that the any one of a variety of heat curable resins
would be suitable. While the heat curable resin would typically be
comprised of polyvinyl acetate, the heat curable resin may be a
polymeric composition such as vinylidene chloride copolymer, latex,
acrylic or other suitable chemical compound. For example, one heat
curable resin suitable for the purposes disclosed herein is sold
under the name SARAN 506 by the Dow Chemical Company of Midland,
Mich. If desired, the resin may contain antimicrobial, antifungal,
or hydrophobic additives, all of which would enhance the properties
of the energy absorbing layer 52 formed by the method 66.
[0066] After saturating the recycled fiber web with resin at 76,
the method 66 proceeds to 78 where the conveyer 120 transports the
recycled fiber web to a needle loom 124. Using a needle-punching
process well known in the art, the needle loom 124 increases the
density of the recycled fiber web. More specifically, the needle
loom 124 bonds the recycled fibers of the recycled fiber web by
mechanically entangling the recycled fibers within the web. To do
so, the needle loom 124 includes a needle board containing a
plurality of downwardly-facing barbed needles arranged in a
non-aligned pattern. The barbs on the needles are positioned such
that they capture fibers when the needle is pressed into the web,
but do not capture any fibers when the needle is removed from the
web. A variety of needles suitable for the purposes disclosed
herein are offered by the Foster Needle Company, Incorporated of
Manitowoc, Wis. As disclosed herein, use of the needle loom 124
provides mechanical compression of the recycled fiber web prior to
the vacuum and/or mechanical compression of the recycled fiber web
to be applied within housing 130 in the manner described
hereinbelow. It should be fully understood, however, that the
needle punching process described herein may be unnecessary if
adequate compression of the recycled fiber web can be obtained by
the vacuum and/or mechanical compression applied within the housing
130. Similarly, it should be equally understood that, if adequate
compression of the recycled fiber web using the needle loom 124,
the vacuum and/or mechanical compression applied to the recycled
fiber web within the housing 130, may be unnecessary and the
housing 130 may be employed solely as an oven or other device which
heats the compressed recycled fiber web.
[0067] After using the needle loom 124 to needle punch the recycled
fiber web at 78, the method 66 proceeds on to 80 and 82 for a
generally simultaneous compressing and heating of the recycled
fiber web. To do so, the conveyor 120 transports the recycled fiber
web to housing 130 where vacuum pressure applied through
perforations (not shown) in first and second counter rotating drums
140 and 142 positioned in a central portion of the housing 130. The
first and second counter rotating drums 140 and 142 heat the web to
the extent necessary to cure the resin saturating the recycled
fiber web. For example, heating the recycled fiber web to a
temperature in the range of 225 to 275.degree. F. for three to five
minutes is suitable for the purposes disclosed herein.
Alternatively, the recycled fiber web may be transported through an
oven by substantially parallel perforated or mesh wire aprons that
mechanically compress the recycled fiber web and simultaneously
cure the resin saturating the recycled fiber web.
[0068] As the compressed and heated recycled fiber web exits the
housing 130, the method 66 proceeds to 84 where the recycled fiber
web is cooled while the pressure applied on the recycled fiber web
is maintained by a pair of substantially parallel wire mesh aprons
170, only one of which is visible in FIG. 5. The aprons 170 are
mounted for parallel movement relative to each other to facilitate
adjustment of the recycled fiber web to a wide range of web
thicknesses. Variously, the recycled fiber web can be cooled slowly
through exposure to ambient temperature air or, in the alternative,
ambient temperature air can be forced through the perforations of
one apron 170, the recycled fiber web and the perforations of the
other apron 170, thereby cooling the recycled fiber web. By
continuing to compress the recycled fiber web during the cooling
process, the recycled fiber web becomes set in its compressed
state. The recycled fiber web is maintained in its compressed state
upon cooling since the solidification of the resin bonds the fibers
together in that state. After being set in its compressed state,
the recycled fiber web may now be characterized as a recycled fiber
batt.
[0069] It is contemplated that a variety of resin bonding
techniques are suitable for the purposes disclosed herein. One such
technique may be seen by reference to FIG. 6A. Here, the recycled
fiber web is compressed by vacuum pressure generated using the
counter-rotating drums 140, 142. As may now be seen, positioned in
a central portion of the housing 130 are counter-rotating drums
140, 142 having perforations 141, 143, respectively. Additionally,
an air circulation chamber 132 is positioned in an upper portion of
the housing 130 while a furnace 134 is positioned in a lower
portion thereof. The drum 140 is positioned adjacent an inlet 144
though which the recycled fiber web is fed by an infeed apron 146.
A suction fan 150 is positioned in communication with the interior
of the drum 140. The lower portion of the circumference of the drum
140 is shielded by a baffle 151 positioned inside the drum 140 such
that the suction-creating air flow is forced to enter the drum 140
through the perforations 141, which are proximate the upper portion
of the drum 140, as the drum 140 rotates.
[0070] The drum 142 is downstream from the drum 140 in the housing
130. The drums 140, 142 can be mounted for lateral sliding movement
relative to one another to facilitate adjustment for a wide range
of web thicknesses (not shown). The drum 142 includes a suction fan
152 that is positioned in communication with the interior of the
drum 142. The upper portion of the circumference of the drum 142 is
shielded by a baffle 153 positioned inside the drum 142 so that the
suction-creating air flow is forced to enter the drum 142 through
the perforations 143, which are proximate the lower portion of drum
142, as the drum 142 rotates. The recycled fiber web fed into the
housing 130 by the infeed apron 146 is held in vacuum pressure as
it moves from the upper portion of the rotating drum 140 to the
lower portion of the counter rotating drum 142. The furnace 134
heats the air in the housing 130 as it flows from the perforations
141, 143 to the interior of the drums 140, 142, respectively, to
cure the resin in the web to the extent necessary to bind together
the fibers in the web.
[0071] Referring to FIG. 6B, in an alternative resin bonding
process, the recycled fiber web is fed into the housing 130' where
a pair of substantially parallel perforated or mesh wire aprons
160, 162 compress the recycled fiber web to the desired extent. As
the compressed recycled fiber web is transported through the
housing 130', oven 134' that the compressed recycled fiber web to
cure the resin to the extent necessary to bind the fibers in the
web together.
[0072] Collectively referring next to FIGS. 4, 5, 6A and 6B, the
method 66 continues to 84 where a pair of substantially parallel
first and second perforated or wire mesh aprons 170 and 172
maintain the recycled fiber web in the compressed state while the
recycled fiber web is cooled to solidify the bonds formed between
the fibers by the resin. Preferably, the aprons 170 and 172 are
mounted for parallel movement relative to each other to facilitate
adjustment for a wide range of web thicknesses (not shown). The web
can be cooled slowly through exposure to ambient temperature air
or, in the alternative, ambient temperature air can be forced
through the perforations of one apron, through the web and through
the perforations of the other apron to cool the web and set it in
its compressed state. The web is maintained in its compressed form
upon cooling since the resin bonds the fibers together in the
compressed state.
[0073] The method 66 proceeds on to 86 where the recycled fiber web
(which, after being set in the compressed state by the cooling
process, shall now be referred to as a recycled fiber batt) is
transported to cutting zone 180 where the lateral edges of the
recycled fiber batt are trimmed to a desired width. The recycled
fiber batt is then cut transversely to a desired length.
[0074] In an alternate embodiment it is contemplated that thermal
bonding may be used to bond the recycled fiber batt together in
lieu of the resin bonding method described herein. Thermal bonding
uses low-melt binder fibers to bind the fibers together. Low-melt
binding fibers do not actually melt as the term is generally
understood. Instead, the low-melt binder fibers become sticky or
tacky when heated to a certain temperature. If the recycled fiber
batt is to be thermally bonded, the low-melt binder fibers are
blended with the recycled fibers to make a homogeneous fiber blend
of recycled fibers and low-melt binder fibers. The fiber blend is
then carded into a recycled fiber web as described above. It is not
necessary to apply a resin to the recycled fiber web if the web is
to be thermally bonded, although, in many instances it may be
desirable to do so to obtain the advantageous features of the resin
set forth herein. The recycled fiber web is then needle punched, if
a compression is desired prior to the generally simultaneous
heating and compression thereof. The recycled fiber web is then
sent to a compression and heating apparatus, such as those
illustrated in FIGS. 6A and 6B, where the heat melts the low-melt
binder fibers. The recycled fiber web is then cooled to complete
formation of the recycled fiber batt and subsequently trimmed to
desired dimensions, again in the same manner previously set forth
with the resin-bonded embodiment of the disclosed recycled fiber
batt.
[0075] In the thermal bonded embodiment, the recycled fiber batt is
preferably formed from a homogeneous blend of binder fibers and
recycled fibers. The binder fibers can be either natural or
synthetic fibers. The binder fibers may also be mono-component
binder fibers or bi-component binder fibers. While the homogeneous
mixture of recycled fibers and binder fibers can be any of a number
of suitable fiber blends, for purposes of illustrating the process
and the blend, the mixture is comprised of binder finders in an
amount sufficient for binding the fibers of the blend together upon
application of heat at the appropriate temperature to melt the
binder fibers. In one example, the binder fibers are in the range
of about 5 percent to about 95 percent by total volume of the
blend. Preferably, the binder finders are present in the range of
about 10 percent to about 15 percent for a high-loft batt and in
the range of about 15 percent to about 40 percent for a densified
batt, as those characteristics are discussed below. The recycled
fibers in the remaining blend volume ranges anywhere from about 5
percent to about 95 percent. Preferably, the recycled fibers are
present in the range of about 85 percent to about 90 percent for a
high-loft batt and in the range of about 60 percent to about 85
percent for a densified batt, as those characteristics are
discussed below. Of course, the foregoing blends are provided by
way of example and it is fully contemplated that other blends of
binder fibers and recycled fibers are suitable for use when forming
a recycled fiber batt in accordance with the techniques disclosed
herein.
[0076] The weight per unit length of the binder fibers is also a
consideration. While coarse binder fibers, e.g. those binder fibers
having a weight per unit length of at least about 5 denier, are
suitable for the purposes described herein, preferably the binder
fibers are fine binder fibers. It is believed that a recycled fiber
batt made of fine binder fibers have a lower porosity due to their
ability to fill smaller void spaces within the recycled fiber batt.
By filling more of the void spaces than coarse binder fibers, the
use of fine binder fibers result in a recycled fiber batt
characterized by better acoustical properties relative to a
recycled fiber batt formed using coarse binder fibers. In various
embodiments, it is contemplated that the weight per unit length of
the fine binder fibers to be used in forming the recycled fiber
batt shall be no greater than about 5 denier, no greater than about
3 denier or no greater than about 1 denier.
[0077] It is further contemplated that, in lieu of the resin or
thermal bonding techniques disclosed herein, various mechanical
bonding techniques may be used to bond the recycled fibers of the
recycled fiber batt together. Broadly speaking, mechanical bonding
is the process of bonding the fibers of a nonwoven fiber web
together without the use of resins, adhesives, or heat. Examples of
mechanical bonding techniques include, among others, needle
punching, hydro entanglement and clustering. As previously set
forth, needle punching is a technique which uses barbed needles to
entangle fibers with one another. Hydro entanglement is a process
uses streams of high pressure water to entangle the fibers of the
nonwoven web. Clustering is the mechanical entanglement of fibers
during the batt forming process. Clustering frequently uses crimped
fibers or fibers that otherwise have a complex shape. It is also
contemplated that the fiber batt may be manufactured using
different combinations of resin bonding, mechanical bonding, and/or
thermal bonding.
[0078] The use of resin in the batt is advantageous for many
reasons. First, resin-bonded batts are less porous than
mechanically bonded or thermally bonded batts. More specifically,
the resin is able to permeate through the batt more thoroughly and
effectively than fibers, such as recycled fibers or binder fibers,
due to its liquid form. The decreased porosity makes the fiber batt
less water permeable, gives the batt better acoustical insulating
properties, and makes it easier to attach various items, such as
the moisture barrier or a floor covering, to the surface of the
batt. In fact, depending on the specific level of water and/or
vapor permeability sought, it is possible to eliminate the need for
the moisture barrier by applying a sufficient amount to resin to
the fiber batt.
[0079] In the embodiment utilizing a nonwoven fiber batt as the
energy absorbing layer 52, the basis weight, density, and thickness
of the underlayment are determined by, among other factors, the
process of compressing the batt as it is cooled. The ratio of batt
density to batt thickness generally dictates whether the
underlayment is a high loft batt or a densified batt. For purposes
herein, a densified energy absorbing layer has a ratio of basis
weight (in ounces) per square foot to thickness (in inches) greater
than approximately 2 to 1. Thus, a densified underlayment would
have a density greater than approximately 1.5 pounds per cubic foot
(pcf). Conversely, an underlayment having a ratio of basis weight
to thickness of less than approximately 2 to 1 and a density less
than 1.5 pcf are defined herein as high loft batts.
[0080] The expected amount of handling prior to installation should
be a consideration when selecting the density of the fiber batt.
Denser fiber batts provide better acoustical properties than less
dense fiber batts. The acoustical properties of the fiber batt are
important because a person of ordinary skill in the art will
generally want the fiber batt to attenuate as much sound as
possible. However, denser fiber batts are also less flexible than
less dense fiber batts. Flexibility is important because a
preferred feature of the fiber batt is the ability to be rolled up
for storage, transportation, handling, and installation. Thus, when
selecting the density of the fiber batt, a person of ordinary skill
in the art must balance the need for acoustical performance with
the need for flexibility. In various embodiments, a suitable
balance for the density of the fiber batt is between about 1 pcf
and about 10 pcf, between about 2 pcf and about 7 pcf, or between
about 3 pcf and about 5 pcf.
[0081] Referring now to FIG. 7, a second method 180 for
manufacturing an energy absorptive/moisture resistive underlayment
will now be described in greater detail. As disclosed herein, the
method 180 is used to form either of the energy absorptive/moisture
resistive underlayment 50-1 or the energy absorptive/moisture
resistive underlayment 50-2 whenever the material to be recycled
when forming the energy absorptive/moisture-resistive underlayment
50-1, 50-2 is waste foam, for example, foam that was previously
used in a product to be disposed of or scrap foam produced during
the manufacture of a foam product such as the excess foam trimmed
from a newly formed foam product so that it has a desired size
and/or shape. As will be more fully described below, the method 180
recycles waste foam while forming an energy absorptive/moisture
resistive underlayment by providing waste foam at 181, shredding
the waste foam into foam pieces at 182, separately mixing a
pre-polymer at 183, coating the foam pieces with the pre-polymer at
184, compressing the foam pieces into an unbonded foam log at 185,
steaming the unbonded foam log at 186, thereby curing the
pre-polymer such that bonds between the pieces of foam, thereby
forming a bonded foam log from the unbonded foam log, drying the
bonded foam log at 187, coring the bonded foam log at 188, peeling
sheets of bonded foam from the bonded foam log at 189 and
laminating at least one moisture barrier onto the sheets of bonded
foam at 191. If desired, the sheets of bonded foam may then be
adhered or otherwise attached to the hard flooring at 192.
[0082] The method 180 for manufacturing an energy
absorptive/moisture resistive underlayment formed using recycled
foam begins with a supply of waste foam, most commonly, variously
sizes pieces of scrap prime foam produced by a prime foam
manufacturer while trimming components formed using foam to a
desired shape or size. It is fully contemplated, however, that both
new and used foam are equally suitable for the purposes disclosed
herein. Importantly, the size and shape of the foam to be recycled
for use in the energy absorptive/moisture resistive underlayment is
unimportant as the provided foam is shredded into smaller foam
pieces prior to formation of a foam log therewith. Variously, the
provided foam to be recycled for subsequent use in an energy
absorptive/moisture resistive underlayment may be polyurethane,
latex, polyvinyl chloride (PVC), or any other polymeric foam of any
density. It is fully contemplated, however, that the energy
absorptive/moisture resistive underlayment may instead be formed
using a variety of foam compositions other than those specifically
recited herein and the identification of certain foams as suitable
for the purposes disclosed herein should not be characterized in a
limiting manner.
[0083] The provided foam is typically generally free of moisture
but may contain an incidental amount of impurities, such as felt,
fabric, fibers, leather, hair, metal, wood, plastic or the like.
Preferably, the provided foam is polyurethane foam with a density
similar to the desired density of the subsequently produced
recycled energy absorptive/moisture resistive underlayment. If
desired, the foam may be sorted by type and/or density prior to
shredding such that foam pieces of similar composition and density
are used to make a single foam log. Using foam of similar
composition and density to make a single foam log produces a more
uniform density throughout the foam log, and thus throughout the
subsequently produced underlayment.
[0084] Once the waste foam to be used to form a bonded foam log has
been provided at 181, the method 180 proceeds to 182 where the
waste foam is placed in a shredding machine for shredding into
smaller foam pieces. Broadly speaking, a shredding machine is a
device provided with a plurality of rotating or otherwise moving
blades capable of cutting foam placed thereinto into smaller
pieces. The amount of time that the waste foam spends in the
shredding machine determines the size of the shredded pieces of
foam provided thereby. Some shredding machines are configured to
operate in a batch mode in which a load of unshredded foam is
deposited into a holding tank where it is cut into small pieces of
foam by the blades. The shredded foam is then removed from the
holding tank and another load of unshredded foam is deposited
thereinto. Other shredding machines are configured to operate in a
continuous mode in which a flow of unshredded foam is continuously
fed into the shredding machine, for example, using a conveyer or
other type of transport system for shredding. As additional
unshredded foam is fed into the shredding machine, a roughly equal
amount of shredded foam is removed from the shredding machine by
the conveyer or other transport system. A shredding machine
suitable for the purposes disclosed herein is the foam shredder
manufactured by the Ormont Corporation of Paramus, N.J.
[0085] It is contemplated that the foam pieces produced by the
shredding machine may have a specific type of geometric shape such
as a spherical or cubical shape. Most commonly, however, the
shredding process performed by the shredding machine will produce
foam pieces that are irregularly shaped and that tend to vary in
shape from piece to piece. Generally, the shape of the smaller foam
pieces produced by the shredding machine is unimportant because the
foam pieces produced thereby will tend to conform to the shape of
the mold later used to form bonded foam logs. Broadly speaking,
however, the smaller foam pieces should be sized such that they are
large enough to be easily handled yet small enough such that there
is not an abundance of empty space between the foam pieces when
used to fill a mold. Preferably, the smaller foam pieces should be
sized such that they all range from about 1/4-inch to about
3/4-inch in length, width and height.
[0086] As disclosed herein, the method 180 includes two discrete
processes--the shredding of waste foam into foam pieces at 182 and
the mixing of a pre-polymer solution at 183--which are performed
generally simultaneous with one another. In the embodiment
disclosed herein, it is contemplated that the primary components of
the pre-polymer solution mixed at 183 are an isocyanate, a polyol
and an oil. As will be more fully described below, the isocyanate
reacts with the polyol at 183 and with moisture in the steam at 186
to bond the pieces of foam together. The oil lowers the overall
viscosity of the pre-polymer solution to facilitate better mixing
and distribution of the components of the pre-polymer mixture. The
lowered viscosity of the pre-polymer solution also allows the
pre-polymer solution to uniformly coat the foam pieces so that
improved bonding occurs. In the embodiment disclosed herein, it is
contemplated that the pre-polymer solution will contain generally
equal amounts (by weight) of the isocyanate, the polyol and the
oil. Thus, if the pre-polymer solution includes about 30 percent
(by weight) of the isocyanate, it would also include about 30
percent (by weight) of the polyol and about 30 percent (by weight)
of the oil.
[0087] It is contemplated that a variety of isocynates, such as
toluene diisocyanate (TDI), diisocyanatodiphenyl methane (MDI) or
blends thereof, may be used when forming the pre-polymer solution.
For example, suitable isocyanates would include, among others,
m-phenylene diisocyanate, p-phenylene diisocyanate, polymethylene
polyphenyl isocyanate, 2,4-toluene diisocyanate, 2,6-toluene
diisocyanate, 4,4-diisocyanatodiphenyl methane, dianisidine
diisocyanate, bitolylene diisocyanate,
naphthalene-1,4-diisocyanate, diphenylene-4,4'-diisocyanate,
xylylene-1,4-diisocyanate, xylylene-1,2-diisocyanate,
xylylene-1,3-diisocyanate, bis(4-isocyanatophenyl)-methane,
bis(3-methyl-4-isocyanatophenyl)-methane, isophorone diisocyanate,
4,4-diphenylpropane diisocyanate, hexamethylene diisocyanate,
methylene-bis-cyclohexylisocyanate, and mixtures thereof. Of
course, it is fully contemplated that isocyanates other than those
specifically recited herein are also suitable for the purposes
disclosed herein and that the formulation of the pre-polymer
solution should not be limited to the particular isocyanates
disclosed herein. The preferred isocyanates are RUBINATE.RTM. 9041
MDI, available from the Huntsman Corporation of Salt Lake City,
Utah, or POLYMERIC MDI 199, available from the Dow Chemical
Corporation of Midland, Mich. The isocyanate comprises between
about 10 percent (by weight) and about 90 percent (by weight) of
the pre-polymer solution; preferably between about 20 percent (by
weight) and about 50 percent (by weight) of the pre-polymer
solution; and most preferably between about 25 percent (by weight)
and about 40 percent (by weight) of the pre-polymer solution.
[0088] It is further contemplated that a variety of polyols, such
as diol, triol, tetrol, polyol or blends thereof, may be used when
forming the pre-polymer solution. For examples, suitable polyols
would include, among others, ethylene glycol, propylene glycol,
butylene glycol, hexanediol, octanediol, neopentyl glycol,
1,4-bishydroxymethyl cyclohexane, 2-methyl-1,3-propane diol,
glycerin, trimethylolethane, hexanetriol, butanetriol, quinol,
polyester, methyl glucoside, triethyleneglycol, tetraethylene
glycol, polyethylene glycol, dipropylene glycol, polypropylene
glycol, diethylene glycol, glycerol, pentaerythritol,
trimethylolpropane, sorbitol, mannitol, dibutylene glycol,
polybutylene glycol, alkylene glycol, oxyalkylene glycol, ethylene
glycol, diethylene glycol, dipropylene glycol, triethylene glycol,
tripropylene glycol, tetraethylene glycol, tetrapropylene glycol,
trimethylene glycol, tetramethylene glycol,
1,4-cyclohexanedimethanol (1,4-bis-hydroxymethylcyclohexane) and
mixtures thereof. Of course, it is fully contemplated that polyols
other than those specifically recited herein are also suitable for
the purposes disclosed herein and that the formulation of the
pre-polymer solution should not be limited to the particular
polyols disclosed herein. The preferred polyol is VORANOL.RTM.
3512A, available from the Dow Chemical Corporation of Midland,
Mich. The polyol comprises between about 10 percent (by weight) and
about 90 percent (by weight) of the pre-polymer solution;
preferably between about 20 percent (by weight) and about 50
percent (by weight) of the pre-polymer solution; and most
preferably, between about 25 percent (by weight) and about 40
percent (by weight) of the pre-polymer solution.
[0089] It is still further contemplated that a variety of oil may
be used when forming the pre-polymer solution. The oil may be any
aromatic or non-aromatic, natural or synthetic oil. For example,
suitable oils would include, among others, naphthenic oil, soybean
oil, vegetable oil, almond oil, castor oil, mineral oil, oiticica
oil, anthracene oil, pine oil, synthetic oil, and mixtures thereof.
Of course, it is fully contemplated that oils other than those
specifically recited herein are also suitable for the purposes
disclosed herein and that the formulation of the pre-polymer
solution should not be limited to the particular oils disclosed
herein. The preferred oil is VIPLEX.RTM. 222, available from the
Crowley Chemical Company of New York, N.Y. The oil comprises
between about 10 percent (by weight) and about 90 percent (by
weight) of the pre-polymer solution; preferably between about 20
percent (by weight) and about 50 percent (by weight) of the
pre-polymer solution; most preferably, between about 25 percent (by
weight) and about 40 percent (by weight) of the pre-polymer
solution.
[0090] In addition to the foregoing components, it is further
contemplated that the pre-polymer solution may also contain any
number of other additives which improve the characteristics of the
bonded foam. For example, the pre-polymer solution may contain a
flame retardant chemical compound, such as melamine, expandable
graphite or dibromoneopentyl glycol, which improves the flame
retardant properties of the bonded foam. The pre-polymer solution
may also contain an antimicrobial additive, such as zinc
pyrithione, which improves the antimicrobial properties of the
bonded foam, as discussed in the aforementioned patent application.
The pre-polymer solution may also contain an antioxidant, such as
butylated hydroxy toluene, which improves the resistance of the
bonded foam to oxidative-type reactions, such as scorch resulting
from high exothermic temperatures. Finally, the pre-polymer
solution may also contain colored dye, such as blue, green, yellow,
orange, red, purple, brown, black, white, or gray dye, to
distinguish certain bonded foam products from other bonded foam
products. Of course, it is fully contemplated that the pre-polymer
solution may contain still other additives other than those
specifically recited herein and that the formulation of the
pre-polymer solution should not be limited to the particular
additives disclosed herein.
[0091] The selected components are combined at 183, typically,
using a mixer, to form a pre-polymer solution having the desired
composition. It is contemplated that the mixer may be either a
dynamic mixer or a static mixer. It is further contemplated that
the mixer may be either a batch mixer or a continuous process
mixer. Preferably, the mixer is a tank containing a motorized
paddle-type mixing blade. Of course, it is fully contemplated that
various types of mixers other than those specifically recited
herein are also suitable for the disclosed purposes disclosed and
that the mixer used to blend the selected components into the
pre-polymer solution should not be limited to the particular types
of mixers disclosed herein. Variously, it is contemplated that the
components of the pre-polymer solution may be combined all at once,
or they may be added one at a time to the pre-polymer solution as
it is being mixed. Preferably, mixing of the pre-polymer solution
continues until there are about 10 percent free isocyanates
available for reacting with the steam during the steaming process.
The mixed pre-polymer solution has a viscosity between about 100
and 1,000 centipoises, preferably between about 400 and 600
centipoises, at a temperature between about 100.degree. F. and
about 110.degree. F. Although the time varies depending on the
composition of the pre-polymer solution, it is contemplated that
the components of the pre-polymer solution are mixed together for
at least about 1 hour prior to application of the pre-polymer
solution to the foam pieces. Preferably, the isocyanate, the
polyol, and the oil are mixed together for at least about 4 hours
and, at the end of the 4 hours, an amine catalyst is added to the
pre-polymer solution and mixed for at least about an additional two
hours.
[0092] After the components of the pre-polymer solution (isocyante,
polyol, oil and any additives) have been mixed together for a
suitable period of time at 182, the method 180 proceeds to 184
where the pre-polymer solution is coated onto the foam pieces.
Variously, it is contemplated that the coating machine may either
be a batch-type coating machine or a continuous-type coating
machine. A batch-type coating machine 200 suitable for the purposes
disclosed herein is illustrated in FIG. 8. As may now be seen, the
coating machine is comprised of a tank 202, an agitator 204, and a
pre-polymer solution applicator 206. The size and shape of the tank
202 may be varied to suit the particular application. Similarly,
the number and type of agitators 204 may be varied to suit the
particular application. In this regard, it should be clearly
understood that, for ease of illustration, a single agitator 204 is
shown in FIG. 8.
[0093] The process of coating a selected amount of foam pieces 210
begins by depositing the foam pieces 210 inside the tank 210. The
pre-polymer solution applicator 206 then sprays pre-polymer
solution 208 onto the foam pieces 210. While the pre-polymer
applicator 206 is spraying the foam pieces 210 with the pre-polymer
solution 208, the agitator 204 rotates with respect to the tank
202, thereby circulating the foam pieces 210 within the tank 202.
As the foam pieces 210 are circulated within the tank 202, the foam
pieces 210 are substantially coated with the pre-polymer solution
208. The time required to substantially coat the foam pieces 210
with the pre-polymer solution 208 varies depending on the volume
and density of the foam pieces 210, the size of the tank 202, the
number and type of agitators 204 and the rate at which the
pre-polymer solution is sprayed onto the foam pieces 210.
Generally, however, it is contemplated that the coating process
will require between about 0.5 minutes and about 15 minutes to
substantially coat the foam pieces 210 with the pre-polymer
solution 208. Preferably, the coating process should require
between about 1 minute and about 10 minutes to substantially coat
the foam pieces 210 with the pre-polymer solution 208. Most
preferably, the coating process should require between about 1.5
minutes and about 2.5 minutes to substantially coat the foam pieces
210 with the pre-polymer solution 208. Although, in the coating
process disclosed herein, the pre-polymer solution 208 is sprayed
onto the foam pieces 210, it is contemplated that the foam pieces
210 may be substantially coated with the pre-polymer solution 208
using a variety of other techniques such as dipping or roller
coating. Accordingly, it is fully contemplated that techniques
other than those specifically recited herein may be used to
substantially coat the foam pieces 210 with the pre-polymer
solution 208 and that the coating process should not be limited to
the particular processes disclosed herein.
[0094] Referring next to FIG. 9, after the foam pieces have been
coated with the pre-polymer, the method 180 proceeds to 185 where
the coated foam pieces are transported to a mold 220 for
compression thereof. The mold 220 comprises a base 229, a
cylindrical wall 224, a reciprocating piston 222, and a steam
injection system 227. A drive system (not shown) coupled to the
piston 222 enables the piston to be driven in either direction
along axis A. By driving the piston 222 along the axis A, the
volume of the cavity defined by the cylindrical wall 224, and the
base 229 can be selectively increased or decreased. In addition to
being configured for movement along the axis A, the piston 222 is
further configured for selective removal from the cavity and
positioning away from the remainder of the mold 220 to facilitate
easy loading of coated foam pieces into the cavity. Typically, the
foam pieces are weighed before being loaded into the mold 220.
After the foam pieces are loaded into the mold 220, the piston 222
compresses the coated foam pieces to form a foam log 226. The
compression ensures complete contact between the coated foam pieces
forming the foam log 226. As the weight of the coated foam pieces
is known and the volume of the cavity into which the coated foam
pieces are compressed may be readily determined based upon the
extent to which the piston 222 penetrates the cavity, the density
of the foam log 226 can be controlled by compressing the foam log
226 to a specific volume. For example, if the coated foam pieces
weigh 100 pounds and the desired density of the foam log is 4
lbs/ft.sup.3, then the piston 222 is driven in direction A until
the volume of the interior cavity defined by the base 229, the
cylindrical sidewalls 224 and the piston 222 is reduced to 25 cubic
feet.
[0095] The mold 222 illustrated in FIG. 9 employs a batch-type
compression. It is fully contemplated, however, that the coated
foam pieces may be compressed into a foam log using a variety of
other techniques. For example, FIG. 11 illustrates an extruder
suitable for forming a foam log using a continuous compression
technique. Thus, it is fully contemplated that compression
techniques other than those specifically recited herein may be used
to compress the coated foam pieces 210 into the foam log 226.
Accordingly, the compression technique employed as part of the
method 180 should not be limited to the particular processes
disclosed herein.
[0096] After the foam pieces 210 are compressed into the foam log
226, the method 180 proceeds to 186 where the foam log 226 is
steamed to cure the pre-polymer. To do so, a steam supply (not
shown) provides a flow of steam 228 to the steam injection system
229. The steam 228 is forced, through apertures 225 in the base
229, into the cavity holding the newly formed foam log 226. The
steam 228 passes through the foam log 226 and exits through
apertures 221 in the piston 222. As the steam passes through the
foam log 226, the moisture in the steam cures the pre-polymer,
thereby establishing bonds between the foam pieces 210 forming the
foam log 226. After passing through the foam log 226, any excess
steam exits through perforations in the piston 222. After being
formed, the bonded foam log 226 is removed from the mold 220. For
example, the mold 220 may be configured such that the wall 224 is
removable, thereby facilitating easy removal of the foam log 226
after the steaming process is complete. Alternately, the foam log
226 may be removed after the piston 222 has been removed from the
cavity and repositioned in the manner hereinabove described. It is
fully contemplated that steaming processes other than those
specifically recited herein may be used to cure the foam log 226.
Accordingly, the steaming process employed as part of the method
180 should not be limited to the particular process disclosed
herein.
[0097] The steam 228 may be any heated steam that is at least about
212.degree. F. and a sufficient pressure to permeate the foam log
226. Preferably, the temperature of the steam is between about
220.degree. F. and about the combustion temperature of the foam
(about 1400.degree. F.). The pressure of the steam is preferably
between about 10 pounds per square inch gauge (psi) and about 100
psi. Most preferably, the temperature of the steam is between about
246.degree. F. and about 256.degree. F. and the pressure of the
steam is between about 13 psi and 15 psi for a batch operation and
between about 30 psi and about 45 psi for a continuous operation.
The steaming time is dependent on the steam pressure and the
density of the foam log. For a 4 pcf foam log and using the most
preferred steam, the steam time is between about 0.5 minutes and
about 3 minutes, preferably about 1.0 minutes and about 1.5
minutes. For an 8 pcf foam log, the steam time is between about 1.5
minutes and about 5 minutes, preferably about 2 minutes and about 3
minutes. Steam times for foam logs of other densities can be
interpolated or extrapolated from these steam times and steam
data.
[0098] After the foam log 226 has been cured and removed from the
mold 220, the method 180 proceeds to 187 where the bonded foam log
226 is allowed to dry. The time required to dry the bonded foam log
226 varies based upon the density of the bonded foam log 226 and
the amount of moisture present in the bonded foam log 226. A lower
density foam log may be sufficiently dry to allow immediate
processing. However, to ensure that the bonded foam log 226 is
sufficiently dry such that moisture in the foam log 226 will not
affect any of equipment used to process the foam log 226, the
bonded foam log 226 is typically set aside to dry for a period
between 12 and to 24 hours at ambient temperature and humidity. If
desired, drying of the bonded foam log 226 may be sped up by
forcing ambient, heated, and/or dried air over or through the
bonded foam log 226. It is fully contemplated that drying processes
other than those specifically recited herein may be used to dry the
bonded foam log 226. Accordingly, the drying process employed as
part of the method 180 should not be limited to the particular
process disclosed herein.
[0099] After drying is complete, the method 180 proceeds to 188 for
coring of the bonded foam log 226. To core the bonded foam log 226,
an aperture is drilled through a center axis thereof. A rod is then
inserted into the aperture, thereby enabling the bonded foam log
226 to be handled without damaging the foam. After coring the log
at 188, the method 180 then proceeds to 189 where a peeling machine
peels the bonded foam log 226. A peeling machine 230 suitable to
peel the bonded foam log 226 may be seen by reference to FIG. 10.
As may now be seen, the peeling machine 230 includes a blade 236, a
conveyor 232, and a take-up roll 234. The bonded foam log 226 is
rotated against the blade 236 such that the blade 236 peels off a
sheet of bonded foam having a uniform thickness, T.sub.1. As
previously set forth, the sheet of bonded foam is employed as a
recycled flooring underlayment for a hard flooring system. As the
bonded foam is peeled off of the bonded foam log 226, the bonded
foam log 226 is continuously lowered with respect to the blade 236
such that the sheet of bonded foam peeled off of the bonded foam
log 226 by the blade 236 maintains the desired thickness T.sub.1 of
foam. In other words, as the diameter of the bonded foam log 226 is
reduced, the bonded foam log 226 is lowered so that a uniform
thickness of sheet of bonded foam is continuously peeled off of the
foam log 226. If desired, a trim station (not shown) positioned
along the conveyor system 232 may be employed to trim the bonded
sheet of foam to a uniform width. The sheet of bonded foam, which
is now suitable for use as part of a flooring underlayment, is
transported by conveyor system 232 and is collected on the take-up
roll 234 for delivery to distributors, wholesalers, retailers
and/or other consumers of the underlayment. If desired, the
conveyor system may be stopped periodically and the continuous
sheet of underlayment may be cut lengthwise and the take-up roll
234 replaced with a new take-up roll so that the rolls of flooring
underlayment 238 are lighter and easier to handle.
[0100] Rather than employing the described batch-type process to
form the bonded foam log 226, it is contemplated that the method
180 may instead be configured to employ a continuous-type
processing technique to form the bonded foam log 226. FIG. 11
illustrates an extruder 240 suitable for continuously compressing
and steaming the foam pieces 210 into a generally continuous bonded
foam log 250. The continuous extruder 240 comprises an upper
conveyor 244, a lower conveyor 242 and a steam injection system
246. The process of compressing and steaming a bonded foam log
commences with the placement of foam pieces 210 onto the lower
conveyor 242. Because the density of the foam log 250 produced by
the continuous extruder 240 depends on the mass flow rate of the
foam pieces 210 through the continuous extruder 240 as well as the
volumetric flow rate of the foam log 250 exiting the extruder, the
foam pieces 210 are deposited onto the lower conveyor 242 at a
specified weight per unit time. As the foam pieces 210 travel
through the continuous extruder 240, the foam pieces 210 are
compressed by the upper conveyor 244. Because the upper conveyor
244 and the lower conveyor 242 travel in the same direction and the
foam pieces 210 are continuously entering the continuous extruder
240, the foam pieces 210 are compressed by the downward traveling
upper conveyor 244. The height of the upper conveyor 244 over the
lower conveyor 242 is adjustable and the density of the foam log
250 produced thereby can be adjusted by raising and lowering the
upper conveyor 242 relative to the lower conveyor 242.
[0101] When the pieces 210 have been compressed into a foam log 250
having a desired density, steam injection system 246 injects a flow
of steam 248 into the foam log 250 through perforations 249 in the
lower conveyor 242. The steam passes through the foam log and any
excess steam exits by passing through perforations (not shown) in
the upper conveyor 244. The continuous extruder 240 is configured
such that the residence time of the foam log 250 in the steaming
area of the continuous extruder 240 is generally equal to the
steaming time required in the batch process previously described
herein. The bonded foam log produced by the continuous extruder 240
is generally rectangular in cross section and, as a result, is
sliced into sheets of flooring underlayment rather than being
peeled in the manner described hereinabove.
[0102] After either a nonwoven fiber batt formed of shoddy material
is formed at 86 or a sheet of bonded foam is formed at 189 (both of
which are, as previously set forth, suitable for use as the
recycled energy absorbing layer 52), the moisture barrier 54 is
laminated onto the recycled energy absorbing layer 52 at either 90
of method 66 or at 191 of method 180 to produce the recycled energy
absorptive/moisture resistive underlayment 50.
[0103] For the embodiment in which the moisture barrier 54 is a
film, FIG. 12 illustrates an apparatus 260 for laminating a
moisture impermeable film onto the recycled energy absorbing layer
52 in accordance with 90 of method 66 or 191 of method 180. A
conveyer 266 transports the recycled energy absorbing layer 52 to
an adhesive applicator 262. The adhesive applicator 262 sprays an
adhesive 264 onto the recycled energy absorbing layer 52 positioned
therebelow. Alternatively, the adhesive applicator 262 could
extrude a frothed adhesive onto the recycled energy absorbing layer
52. A moisture resistant film 274 from roll 268 is then layered
onto a first side surface of the recycled energy absorbing layer
52. Two nip rollers 270 compresses the moisture resistant film 274
and the recycled energy absorbing layer 52 together to form the
recycled energy absorptive/moisture resistive underlayment 50
having a moisture barrier 54 on one side of the recycled energy
absorbing layer 52. If the adhesive 264 needs to be cured, the
recycled energy absorptive/moisture resistive underlayment 50 can
pass through an oven (not shown) to cure the adhesive. The recycled
energy absorptive/moisture resistive underlayment 50 is then
collected on roller 272 and shipped to wholesalers, distributors
and/or retailers as needed.
[0104] For the embodiment in which the moisture barrier 54 is a
closed cell foam, FIG. 13 illustrates an apparatus 300 for
laminating a layer of closed cell foam 304 onto the recycled energy
absorbing layer 52. As may now be seen, a conveyor 306 transports
the recycled energy absorbing layer 52 to a foam applicator 302
which deposits foam 304 onto the recycled energy absorbing layer 52
positioned therebelow. Alternatively, the foam 304 may be sprayed,
roller coated, or otherwise applied to the recycled energy
absorbing layer 52. In still another alternative, the recycled
energy absorbing layer 52 may be dipped into a vat of the foam 304.
A doctor blade 308 regulates the amount of foam 304 deposited on
top of the recycled energy absorbing layer 52. The foam 304 and
recycled energy absorbing layer 52 are then transported through an
oven 310 that cures the foam 304. The resulting recycled energy
absorptive/moisture resistive underlayment 50 having a moisture
barrier 54 formed on one side thereof is then collected on a roller
312 and shipped to wholesalers, distributors, and/or retailers as
needed.
[0105] If the recycled energy absorbing layer is 52 is a nonwoven
fiber batt formed using shoddy fibers, the moisture barrier 54 may
be produced by calendering one or more surfaces of the nonwoven
fiber batt. Calendering is a process by which one surface of a
nonwoven fiber batt is modified by passing the batt between a set
of cylindrical drums, one of which is heated. Alternatively, the
batt can be placed on a smooth conveyor belt and passed through an
oven. The heat from the cylindrical drums or oven melts the
synthetic fibers in the nonwoven fiber batt such that they form a
thin layer of material similar to a moisture impermeable film. The
calendered surface of the nonwoven fiber batt differs from a layer
of moisture impermeable film laminated onto a surface of the
nonwoven fiber batt in that the nonwoven fiber batt and the
calendered surface are formed from the same material, generally
polymeric material, but in fiber and sheet form, respectively. The
calendered surface of the nonwoven fiber batt is generally moisture
impervious but, depending on the specific temperature and
calendering apparatus used, may be vapor permeable. Because the
calendered surface of the nonwoven fiber batt is moisture
impervious, the calendered surface of the nonwoven fiber batt acts
as a moisture barrier, thereby eliminating the need for another
type of moisture barrier. Thus, calendering the surface of the
nonwoven fiber batt is advantageous because it eliminates the need
to laminate a moisture barrier thereonto.
[0106] In an additional alternative embodiment, the recycled energy
absorbing layer 52 and/or the moisture barrier 54 can contain a
scented or deodorizing additive. Scented and deodorizing additives
are advantageous because they improve the smell of the flooring and
can mask or eliminate unwanted odors. Scented and deodorizing
additives are well known in the art, as evidenced by scented and
deodorizing carpet cleaner. It is fully contemplated that a scented
or deodorizing additive may be included: (a) in the recycled fiber
blend used to form the recycled energy absorbing layer 52 comprised
of a nonwoven fiber batt formed from shoddy fibers; (b) within the
pre-polymer used to form the recycled energy absorbing layer 52
comprised of a foam pad formed from bonded foam; or (c) within the
moisture barrier 54 itself. Alternatively, the scented or
deodorizing additive can be attached to the recycled energy
absorbing layer 52, the moisture barrier 54, or both.
[0107] It is contemplated that methods other than the disclosed
adhesive techniques may be used to laminate the moisture barrier 54
onto the energy absorbing layer 52. For example, some moisture
barriers 54 become tacky when heated. If such a moisture barrier 54
were used, the moisture barrier 54 would be layered onto the energy
absorbing layer 52 without the use of an adhesive. The energy
absorbing layer 52 and moisture barrier 54 would then be heated to
make the moisture barrier 54 tacky such that the moisture barrier
54 bonds to the energy absorbing layer 52. When the underlayment 50
cools, the moisture barrier 54 would then be attached to the energy
absorbing layer 52 without the use of a separate adhesive.
Alternatively, if the moisture barrier 54 and the energy absorbing
layer 52 contain polymeric and/or thermoplastic materials, the
moisture barrier 54 and the energy absorbing layer 52 can be
integrally joined by heating the moisture barrier 54 and the energy
absorbing layer 52, contacting or compressing the moisture barrier
54 and the energy absorbing layer 52 together, and then cooling the
moisture barrier 54 and the energy absorbing layer 52. It is
contemplated that any other bonding method that does not use an
adhesive may also be used to laminate the moisture barrier 54 onto
the energy absorbing layer 52 to form the recycled energy
absorptive/moisture resistive underlayment 50.
[0108] If it is desired that the recycled energy
absorptive/moisture resistive underlayment 50 be attached to the
hard flooring 60 at 92 of method 66 or at 192 of method 180, the
recycled energy absorptive/moisture resistive underlayment 50 is
preferably attached to the hard flooring layer 60 after the
moisture barrier 54 has been attached to the recycled energy
absorbing layer 52. The process of adhering the recycled energy
absorbing layer 52 onto the hard flooring 60 is similar to the
process of adhering the moisture barrier 54 onto the recycled
energy absorbing layer 52. More specifically, an adhesive is
sprayed onto a side surface of the hard flooring 60 and the
recycled energy absorptive/moisture resistive underlayment 50 is
subsequently laminated onto an underside of the hard flooring 60. A
pair of nip rollers ensure that the recycled energy
absorptive/moisture resistive underlayment 50 completely contacts
the hard flooring 60. As part of the process of attaching the
recycled energy absorptive/moisture resistive underlayment 50 to
the hard flooring 60, the hard flooring 60 can be inverted so the
side that faces up during the manufacturing process will be the
underside of the hard flooring 60 when the hard flooring layer 60
is installed. By doing so, the force of gravity shall be able hold
the recycled energy absorptive/moisture resistive underlayment 50
on the hard flooring 60 until the adhesive takes full effect and
bonds the two together.
[0109] Another consideration for the recycled energy
absorptive/moisture resistive underlayment 50 is the thickness of
the recycled energy absorbing layer 52. While thicker recycled
energy absorbing layers 52 are preferred in some applications, for
example, soft flooring applications such as carpet underlayment,
thinner recycled energy absorbing layers 52 are preferred for use
in conjunction with hard flooring. An example of a recycled energy
absorbing layer 52 forming a component of a recycled energy
absorptive/moisture resistive underlayment 50 suitable for use with
hard flooring would have a thickness of between about 0.05 inches
and about 0.25 inches, a density of between about 2 pcf and about
20 pcf, and a basis weight of between about 0.5 ounces per square
foot and about 10 ounces per square foot. Preferably, the recycled
energy absorbing layer 52 has a thickness between about 0.1 inches
and about 0.3 inches, a density between about 5 pcf and about 10
pcf, and a basis weight between about 1 ounce per square foot and
about 4 ounces per square foot. A recycled energy
absorptive/moisture resistive underlayment formed in accordance
with foregoing would typically come in a 3 foot by 60 foot roll and
have a roll weight of about 28 pounds.
[0110] There are many advantages to using the recycled energy
absorptive/moisture resistive underlayment 50 over existing
underlayments. The recycled energy absorptive/moisture resistive
underlayment 50 contains recycled fibers or bonded foam, either of
which would tend to lower the cost of manufacturing the recycled
energy absorptive/moisture resistive underlayment 50 whenever the
cost of recycling those components of the recycled energy
absorptive/moisture resistive underlayment 50 is less than the cost
of using new components, for example, prime foam, in the recycled
energy absorptive/moisture resistive underlayment 50. With lowered
manufacturing costs, the manufacturer can sell the recycled energy
absorptive/moisture resistive underlayment 50 to the consumer at a
lower cost. The recycled materials in the underlayment 50 are also
appealing to consumers who prefer recycled materials for
environmental reasons. The recycled energy absorptive/moisture
resistive underlayment 50 can also be attached to a bottom side
surface of hard flooring 60 so that the time and complexity of
installing the hard flooring system 49 comprised of the recycled
energy absorptive/moisture resistive underlayment 50 and the hard
flooring 60 is reduced substantially. The recycled energy
absorptive/moisture resistive underlayment 50 also acts a moisture
barrier, absorbs the sound generated by a person walking on the
recycled energy absorptive/moisture resistive underlayment 50 and
smoothes irregularities in the subfloor 62 on which the hard
flooring system 49 is installed.
[0111] While a number of preferred embodiments of recycled energy
absorptive/moisture resistive underlayment and associated hard
flooring system have been shown and described herein, modifications
thereof may be made by one skilled in the art without departing
from the spirit and scope of the disclosed teachings. Accordingly,
the embodiments described herein are provided purely by way of
example and are not intended to be limiting. Many variations,
combinations, and modifications of the teachings disclosed herein
are possible and are contemplated as being fully within the scope
of the teachings set forth herein. Accordingly, the scope of
protection is not limited by the description set out above, but is
defined by the scope of the claims which follow, that scope
including all equivalents of the subject matter thereof.
* * * * *