U.S. patent application number 11/548154 was filed with the patent office on 2008-01-31 for high strength ream wrap.
Invention is credited to William R. Arndt, LouAnn S. Mueller, Michael R. Nowak.
Application Number | 20080026236 11/548154 |
Document ID | / |
Family ID | 21815447 |
Filed Date | 2008-01-31 |
United States Patent
Application |
20080026236 |
Kind Code |
A1 |
Nowak; Michael R. ; et
al. |
January 31, 2008 |
HIGH STRENGTH REAM WRAP
Abstract
A new high strength poly one-side ream wrapper made by utilizing
copolymer and/or terpolymer resins.
Inventors: |
Nowak; Michael R.; (Hilbert,
WI) ; Mueller; LouAnn S.; (Little Chute, WI) ;
Arndt; William R.; (Hilbert, WI) |
Correspondence
Address: |
DUANE MORRIS, LLP;IP DEPARTMENT
30 SOUTH 17TH STREET
PHILADELPHIA
PA
19103-4196
US
|
Family ID: |
21815447 |
Appl. No.: |
11/548154 |
Filed: |
October 10, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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10023500 |
Dec 17, 2001 |
7297410 |
|
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11548154 |
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Current U.S.
Class: |
428/511 ;
162/119 |
Current CPC
Class: |
B32B 29/00 20130101;
Y10T 428/31909 20150401; Y10T 428/31938 20150401; Y10T 428/31902
20150401; Y10T 428/3188 20150401; Y10T 428/31899 20150401; Y10T
428/31895 20150401; B32B 27/10 20130101 |
Class at
Publication: |
428/511 ;
162/119 |
International
Class: |
D21H 19/00 20060101
D21H019/00; D21F 13/00 20060101 D21F013/00 |
Claims
1-11. (canceled)
12. A method for producing a high strength poly one side ream
wrapper comprising; coextruding said copolymer and/or terpolymer
with a polyethylene monomer layer by feeding said copolymer and/or
terpolymer layer and said polyethylene monomer layer through a
coextruder die; forming a coextrudate; applying said coextrudate to
a paper surface with said polyethylene monomer facing said paper;
said coextrudate applied to said paper surface between a backing
roll and a chill roll; creating a poly coated paper with one layer
of copolymer or terpolymer and one layer of polyethylene
monomer.
13. The method of claim 12 further comprising: blending said
copolymer and/or terpolymer with a polyethylene monomer prior to
said coextruding.
14. A high strength poly one side ream wrapper comprising; a
co-extruded poly coated paper having one layer of polyethylene
monomer on top of a paper layer and a layer of copolymer or
terpolymer on top of said polyethylene monomer layer.
15. The high strength poly one side ream wrapper of claim 14
wherein said copolymer or terpolymer layer contains polyethylene
monomer.
16. A method for producing a high strength poly one side ream
wrapper comprising; coextruding a copolymer and/or terpolymer layer
with a layer of polyethylene monomer on each side of said coploymer
and/or terpolymer layer by feeding said copolymer and/or terpolymer
layer and said polyethylene monomer layers through a coextruder
die; forming a coextrudate; applying to a paper surface said
coextrudate so that one of said polyethylene monomer layers faces
said paper by running said coextrudate and said paper between a
backing roll and a chill roll; creating a poly coated paper with
one layer of copolymer or terpolymer between two layers of
polyethylene monomer.
17. The method of claim 16 further comprising; blending said
copolymer and/or terpolymer with a polyethylene monomer prior to
said coextruding.
18-19. (canceled)
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a high strength poly
one-side ream wrapper.
BACKGROUND OF THE INVENTION
[0002] Ream wrap is the wrapper around the packages of cut size
(81/2.times.11 etc.) paper that is used for printers, copy
machines, etc. This wrapper has traditionally been paper (poly
coated or two papers laminated with poly), plastic film, or a
paper/solid plastic film combination.
[0003] U.S. Pat. No. 5,250,348 relates to an improved wrapper paper
for use in very low contact pressure applications. A wrapper paper
for pressure sensitive products bearing on one of its flat surfaces
a layer of polyethylene and on the opposite of its flat surfaces a
layer of a primer selected from the polyalkyleneimine class, at
least portions of the opposite flat coated surfaces facing one
another in overlapping relationship when the paper is wrapped about
a product, the overlying areas of the wrapper paper being sealed to
one another by heat means and the application of very low pressure
to the overlapping portions. The invention relates to wrapper
papers for pressure sensitive products, such as paper employed in
the wrapping for storage and shipping of ream quantities of
carbonless printing papers.
[0004] U.S. Pat. No. 5,989,724 relates to a recyclable and
repulpable ream wrap and related methods of manufacture. Recyclable
and repulpable coated paper stock, preferably for use as ream wrap,
comprising a substrate coated on at least one surface with a base
coat and at least one additional coat over a base coat. Both coats
are water based dispersions of a polymer selected from the group
consisting of acrylic polymers, acrylic copolymers, polyvinyl
acetate, polyvinyl alcohol, ethylene-vinyl acetate, polyvinyl
chloride, styrene butadiene copolymers, polyvinylidiene chloride
and its copolymers, or starch. The wax free coating forms a
pin-hole free continuous film on the substrate which is resident to
water and water vapor. The invention also includes processes for
making and recycling the coated stocks. The invention concerns
coated paper stocks, preferably for use as ream wraps, comprised of
a substrate coated on at least one surface with a base coat and at
least one additional coat over said base coat both of which are
applied as wax free water based polymeric dispersions.
[0005] U.S. Pat. No. 4,020,215 relates to an extrusion of
polyolefin onto paper at decreased temperatures. By coating a paper
substrate first with a polyalkyleneimine and then with a polymer
containing groups which react chemically with the imino groups of
the polyalkyleneimine, a polyolefin can be extruded onto the
substrate with good adhesion at temperatures lower than the
temperature that would be required to obtain the same degree of
adhesion if the polymer containing the reactive groups were not
present.
[0006] U.S. Pat. No. 3,230,135 relates to a process for coating
paper using a polyimine precoat and products thereof. The invention
relates to a method of coating paper materials with a thin polymer
film, and to the polymer coated product. The invention relates to
depositing of an organic polyimine which has the basic chain
structure of a polyethyleneimine, interposed between a substrate
and a heat-sealed polymer coating thereon, particularly a
polyethylene coating, which improves adhesion and heat seal
strength.
[0007] As small offices and home offices have proliferated the
distribution of reams of paper has changed from boxes to large
users, to retail stores and mail order for the small office/home
office segments. This has placed increasing demands on the wrapper
because of the increased and rougher handling of the individual
reams. The result has been more reams breaking open which breaks
the moisture barrier, allowing the sheets of wrapped paper to
absorb moisture, get minor curl, and jam in the printer or copy
machine. As a result the market needs a stronger ream wrapper.
Machine direction and cross direction tear strength properties are
a measure of the overall strength of the wrapper and its ability to
resist breaking open.
[0008] One such ream wrap product is a poly one-side ream wrap. The
poly one-side ream wrap is a sheet of paper with a low density
polyethylene coating on one side. A typical paper used in this
application is produced by Canfor in a 50 pound (per 3,000 sq feet)
basis weight. Persons making ream wrap would put low-density
polyethylene monomer on the product in various weights (7 to 14
pounds of polyethylene per 3,000 sq. feet of product is a typical
poly coating amount). The low-density polyethylene used is a
monomer resin produced with ethylene. Below is representative
strength data for 10 pounds of low density monomer coated on paper.
As shown below, this coating has increased the tear strength of the
product only slightly versus plain paper utilizing paper industry
strength tests (Standard TAPPI tests).
TABLE-US-00001 Machine Direction Cross Direction Tear Tear 50#
Canfor Paper 122 137 50# Canfor Paper with 124 141 10# Polyethylene
monomer Strength Gain 2 4 MD Tear test-TAPPI T-414-units grams of
force CD Tear test-TAPPI T-414-units grams of force
SUMMARY OF THE INVENTION
[0009] The present invention relates to a new high strength poly
one-side ream wrapper. The product is made by utilizing copolymer
and/or terpolymer resins. The copolymer and terpolymer resins are
made by combining butene, hexene, and/or octene with ethylene in
the feed stocks being used to make the resin. It is an object of
the present invention for the product to be produced by applying
the copolymer or terpolymer to the paper surface or by blending the
copolymer and/or terpolymer resins with low density polyethylene
monomer resins before applying it to the paper surface. It is an
object of the invention to produce the product of the present
invention by co-extruding the low density polyethylene resin
(monomer utilizing ethylene feed stock) with copolymer or
terpolymer resins.
[0010] The present invention relates to a high strength poly
one-side ream wrapper comprising paper and copolymer and/or
terpolymer resins. The copolymer and/or terpolymer resins comprise
butene, hexene, and/or octene with ethylene in feed stocks. The
copolymer and/or terpolymer resins are applied to a surface of the
paper. It is an object of the present invention for the paper to be
additionally coated with low density polyethylene monomer resins.
It is an object of the present invention for the low density
polyethylene resin to be a monomer utilizing ethylene feed
stock.
[0011] The present invention relates to a method for producing a
high strength poly one side ream wrapper comprising; co-extruding a
low density polyethylene resin with copolymer or terpolymer resins
onto a paper surface.
[0012] The present invention relates to a method for producing a
high strength poly one side ream wrapper comprising; feeding a
copolymer and/or terpolymer into an extruder die creating an
extrudate and then coating a paper surface with said extrudate
between a backing roll and a chill roll. This forms a poly coated
paper with the copolymer and/or terpolymer coating.
[0013] The present invention relates to a method for producing a
high strength poly one side ream wrapper comprising; blending a
low-density monomer polyethylene resin with a copolymer and/or
terpolymer resin and feeding the mixture into an extruder die
creating an extrudate. The extrudate is applied to a paper surface
between a backing roll and a chill roll creating a poly coated
paper with polyethylene monomer and copolymer or terpolymer blended
into the monomer.
[0014] The present invention relates to a method for producing a
high strength poly one side ream wrapper comprising; coextruding a
copolymer and/or terpolymer with a polyethylene monomer layer by
feeding the copolymer and/or terpolymer layer and the polyethylene
monomer layer through a coextruder die forming a coextrudate. The
copolymer and/or terpolymer layer can be blended with a
polyethylene monomer. The coextrudate is applied to a surface of a
paper wherein the copolymer and/or terpolymer layer face the paper
surface, the co-extrudate being applied to the paper surface
between a backing roll and a chill roll; creating a poly coated
paper having one layer of copolymer or terpolymer and one layer of
polyethylene monomer.
[0015] The present invention relates to a high strength poly one
side ream wrapper comprising; a co-extruded poly coated paper
having one layer of copolymer and/or terpolymer on top of the paper
and one layer of polyethylene monomer on top of the copolymer or
terpolymer layer. The copolymer and/or terpolymer layer can also
contain polyethylene monomer.
[0016] The present invention further relates to a method for
producing a high strength poly one side ream wrapper comprising;
coextruding a copolymer and/or terpolymer layer with a polyethylene
monomer layer by feeding the copolymer and/or terpolymer layer and
the polyethylene monomer layer through a coextruder die to form a
coextrudate. The copolymer and/or terpolymer layer can be blended
with a polyethylene monomer The coextrudate is applied to a paper
surface with the polyethylene monomer facing the paper; the
coextrudate applied to the paper surface between a backing roll and
a chill roll. This creates a poly coated paper with one layer of
copolymer or terpolymer and one layer of polyethylene monomer.
[0017] The present invention relates to a high strength poly one
side ream wrapper comprising; a co-extruded poly coated paper
having one layer of polyethylene monomer on top of a paper layer
and a layer of copolymer or terpolymer on top of the polyethylene
monomer layer. The copolymer and/or terpolymer layer can be blended
with polyethylene monomer.
[0018] The present invention relates to a method for producing a
high strength poly one side ream wrapper comprising; coextruding a
layer of copolymer and/or terpolymer and a layer of polyethylene
monomer on each side of the copolymer and/or terpolymer layer by
feeding the copolymer and/or terpolyner layer and the polyethylene
monomer layers through a coextruder die forming a coextrudate. The
copolymer and/or terpolymer layer can also contain polyethylene
monomer. The coextrudate is applied to a paper surface so that one
of the polyethylene monomer layers faces the paper by running the
coextrudate and the paper between a backing roll and a chill roll.
This creates a poly coated paper with one layer of copolymer or
terpolymer between two layers of polyethylene monomer.
[0019] The present invention relates to a high strength poly one
side ream wrapper comprising; a poly coated paper having one layer
of polyethylene monomer on top of a paper layer followed by a layer
of copolymer or terpolymer having on top of it a layer of
polyethylene monomer. The copolymer and/or terpolymer layer can
also contain polyethylene monomer.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 illustrates a process for forming a poly coated paper
with a copolymer and/or terpolymer coating.
[0021] FIG. 2 illustrates a process for forming a poly coated paper
with polyethylene monomer and copolymer and/or terpolymer blended
into the monomer.
[0022] FIG. 3 illustrates a process for forming a coextruded poly
coated paper with one layer of copolymer or terpolymer and one
layer of polyethylene monomer.
[0023] FIG. 4 illustrates the product formed by the process of FIG.
3.
[0024] FIG. 5 illustrates a process for forming a coextruded poly
coated paper with one layer of copolymer or terpolymer and one
layer of polyethylene monomer.
[0025] FIG. 6 illustrates the product formed by the process of FIG.
5.
[0026] FIG. 7 illustrates a process for forming a coextruded poly
coated paper with one layer of copolymer or terpolymer between two
layers of polyethylene monomer.
[0027] FIG. 8 illustrates the product formed by the process of FIG.
7.
[0028] FIG. 9 illustrates a process for forming a co-extruded poly
coated paper with one layer of polyethylene monomer between two
layers of copolymer and/or terpolymer resin.
[0029] FIG. 10 illustrates the product formed by the process of
FIG. 9.
DETAILED DESCRIPTION OF THE INVENTION
[0030] In an embodiment of the present invention, the low density
polyethylene resin is a monomer utilizing ethylene feed stock. The
copolymer and terpolymer resins are made by combining butene,
hexene and/or octene feedstock with ethylene feedstock.
[0031] In one embodiment shown in FIG. 1, the copolymer and
terpolymer resins are applied to the paper surface. The copolymer
and/or terpolymer 10 are fed into an extruder die 30 where it
becomes extrudate 40. The extrudate 40 is coated on the paper 20
between the backing roll 50 and the chill roll 60 to form a poly
coated paper with copolymer and/or terpolymer coating 70.
[0032] In a further embodiment shown in FIG. 2, low-density monomer
polyethylene resin 80 is mixed with copolymer and/or terpolymer
resins 10 before or as being fed into an extruder die 30. The
low-density polyethylene monomer and copolymer and/or terpolymer
resin becomes extrudate 40. The extrudate 40 is applied to the
paper surface 20 between the backing roll 50 and the chill roll 60.
This creates a poly coated paper with polyethylene monomer and
copolymer or terpolymer blended into the monomer 90.
[0033] In a further embodiment, shown in FIG. 3, the copolymer
and/or terpolymer layer 10 which may be blended with polyethylene
monomer, is coextruded with a polyethylene monomer layer 80. The
copolymer and/or terpolymer layer 10 and the polyethylene monomer
layer 80 are fed through a coextruder die 130 to form coextrudate
140 wherein the coextrudate 140 has the copolymer and/or terpolymer
10 facing the paper 120. The co-extrudate 140 is applied to the
paper surface 120 between the backing roll 50 and the chill roll
60. This creates a poly coated paper 170 with one layer of
copolymer or terpolymer and one layer of polyethylene monomer.
[0034] FIG. 4 shows the product made by the process shown in FIG. 3
wherein the co-extruded poly coated paper 170 has one layer of
copolymer or terpolymer 180 on top of the paper 120 and one layer
of polyethylene monomer 110 on top of layer 180.
[0035] In FIG. 5 the copolymer and/or terpolymer layer 10 which may
be blended with a polyethylene monomer, is coextruded with a
polyethylene monomer layer 80. The copolymer and/or terpolymer
layer 10 and the polyethylene monomer layer 80 are fed through a
coextruder die 130 to form coextrudate 140 wherein the coextrudate
140 has the polyethylene monomer 80 facing the paper 120. The
co-extrudate 140 is applied to the paper surface 120 between the
backing roll 50 and the chill roll 60. This creates a poly coated
paper 170 with one layer of copolymer or terpolymer and one layer
of polyethylene monomer.
[0036] FIG. 6 shows product made by the process shown in FIG. 5
wherein the co-extruded poly coated paper 170 has one layer of
polyethylene monomer 110 on top of paper layer 120 and layer 180 on
top of layer 110.
[0037] In FIG. 7 the copolymer and/or terpolymer layer 10 which may
be blended with polyethylene monomer, is coextruded with a layer of
polyethylene monomer 80 on each side. The copolymer and/or
terpolymer layer 10 and the polyethylene monomer layers 80 are fed
through a coextruder die 130 to form coextrudate 140 wherein the
coextrudate 140 has one of the polyethylene monomer layers 80
facing the paper 120. The co-extrudate 140 is applied to the paper
surface 120 between the backing roll 50 and the chill roll 60. This
creates a poly coated paper 210 with one layer of copolymer or
terpolymer between two layers of polyethylene monomer.
[0038] FIG. 8 shows the product made by the process shown in FIG. 7
wherein the co-extruded poly coated paper 120 has one layer of
polyethylene monomer 110 on top of paper layer 120 followed by
layer 180 having on top of it a second layer 110.
[0039] In FIG. 9 the copolymer and/or terpolymer layer 10 which may
be blended with polyethylene monomer, is coextruded with a layer of
polyethylene monomer 80 on each side. The copolymer and/or
terpolymer layer 10 and the polyethylene monomer layers 80 are fed
through a coextruder die 130 to form coextrudate 140 wherein the
coextrudate 140 has one of the polyethylene monomer layers 80
facing the paper 120. The co-extrudate 140 is applied to the paper
surface 120 between the backing roll 50 and the chill roll 60. This
creates a poly coated paper 220 with one layer of copolymer or
terpolymer between two layers of polyethylene monomer.
[0040] FIG. 10 shows the product made by the process shown in FIG.
9 wherein the co-extruded poly coated paper 120 has one layer of
polyethylene monomer 110 on top of paper layer 120 followed by
layer 180 having on top of it a second layer 110.
[0041] By utilizing these copolymer and/or terpolymer resins the
present invention achieves a substantial improvement in the tear
strength of the ream wrapper. Below are results using the same 50#
Canfor paper as above and 14 pounds of combined copolymer or
terpolymer resin and low density polyethylene monomer which shows
the significant strength gain versus the traditional low density
polyethylene shown above.
TABLE-US-00002 Machine Cross Direction Direction Tear Tear 50#
Canfor Paper 122 137 50# Canfor Paper with 14# copolymer 196 240
and/or terpolymer resin or a blend of low density polyethylene
monomer resin and copolymer or terpolymer resin or a coextrusion of
low density monomer polyethylene resin and copolymer and/or
terpolymer resin Strength Gain 70 103 MD Tear test-TAPPI
T-414-units grams of force CD Tear test-TAPPI T-414-units grams of
force
* * * * *