U.S. patent application number 11/707145 was filed with the patent office on 2007-06-28 for textile laminate.
Invention is credited to Chi-Heng Lee, Cheng-Wu Ying.
Application Number | 20070149082 11/707145 |
Document ID | / |
Family ID | 34215219 |
Filed Date | 2007-06-28 |
United States Patent
Application |
20070149082 |
Kind Code |
A1 |
Ying; Cheng-Wu ; et
al. |
June 28, 2007 |
Textile laminate
Abstract
A textile laminate includes a hydrophobic membrane, an inner
fabric layer and an outer fabric layer sandwiching the hydrophobic
membrane. The hydrophobic membrane has a plurality of tangled
polymer fibers, a plurality of pores among the polymer fibers, and
a plurality of adhesive powder attached on the polymer fibers on
the top and bottom surfaces. The grain size of each adhesive
powders is small enough to remain the pores without obstructing
permeability. The pores in the PTFE film are water vapor permeable
and liquid water impermeable.
Inventors: |
Ying; Cheng-Wu; (Taoyuan
County, TW) ; Lee; Chi-Heng; (Taoyuan County,
TW) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
34215219 |
Appl. No.: |
11/707145 |
Filed: |
February 16, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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10932007 |
Sep 2, 2004 |
7214288 |
|
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11707145 |
Feb 16, 2007 |
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Current U.S.
Class: |
442/381 |
Current CPC
Class: |
B32B 37/12 20130101;
Y10T 428/24331 20150115; D04H 1/4374 20130101; B01D 71/36 20130101;
Y10T 442/674 20150401; D04H 1/593 20130101; Y10T 428/24273
20150115; A41D 31/125 20190201; B32B 2437/00 20130101; Y10T
428/24322 20150115; B32B 2262/0253 20130101; B32B 2307/73 20130101;
A41D 31/102 20190201; B32B 3/26 20130101; B32B 5/26 20130101; Y10T
442/659 20150401; Y10T 442/677 20150401; B32B 2327/18 20130101;
Y10T 442/668 20150401; B32B 2037/1238 20130101; B32B 2307/7265
20130101 |
Class at
Publication: |
442/381 |
International
Class: |
B32B 5/26 20060101
B32B005/26 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 2, 2003 |
TW |
92215858 |
Claims
1. A textile laminate comprising: a hydrophobic membrane with a top
surface and a bottom surface, the hydrophobic membrane having a
plurality of tangled polymer fibers, a plurality of pores among the
polymer fibers, and a plurality of adhesive powder attached to the
polymer fibers on the top surface and the bottom surface, and a
grain size of each adhesive powder is small enough to remain the
pores without obstructing permeability; an outer fabric layer
bonded on the top surface of the hydrophobic membrane by the
adhesive powder located on the top surface of the hydrophobic
membrane; and an inner fabric layer bonded on the bottom surface of
the hydrophobic membrane by the adhesive powder located on the
bottom surface of the hydrophobic membrane; wherein the pores in
the hydrophobic membrane are water vapor permeable and liquid water
impermeable.
2. The textile laminate as claimed in claim 1 wherein the
hydrophobic membrane comprises a PTFE (polyterafluoroethylene) film
and the polymer fibers are PTFE fibers.
3. The textile laminate as claimed in claim 1 wherein the outer
fabric layer comprises synthetic or natural fibers or blends
thereof.
4. The textile laminate as claimed in claim 1 wherein the inner
fabric layer comprises a hydrophilic material.
5. The textile laminate as claimed in claim 4 wherein the inner
fabric layer comprises cotton, wool, felt, synthetic fibers, or a
combination thereof.
6. The textile laminate as claimed in claim 1 wherein the inner
fabric layer comprises a hydrophilic material with high
hydrophilicity and rewetting properties to provide a rapid water
absorption ability and improve a water diffusion ability of the
textile laminate.
7. The textile laminate as claimed in claim 1 wherein the grain
size of the adhesive powder have diameters about 50 to 500 nm in
diameter.
8. A garment formed of the textile laminate as claimed in claim 1
wherein the inner fabric layer is an inner side of the garment in
contact with a wearer and the outer fabric layer is an outer side
of the garment exposed to the environment.
9. A textile laminate comprising: a hydrophobic membrane with a top
surface and a bottom surface, the hydrophobic membrane having a
plurality of tangled polymer fibers, a plurality of pores among the
polymer fibers, and a plurality of adhesive powder attached to the
top surface and the bottom surface of hydrophobic membrane; an
outer fabric layer bonded on the top surface of the hydrophobic
membrane by the adhesive powder located on the top surface of the
hydrophobic membrane; and an inner fabric layer comprising a
hydrophilic material bonded on the bottom surface of the
hydrophobic membrane by the adhesive powder located on the bottom
surface of the hydrophobic membrane; wherein the pores in the
hydrophobic membrane are water vapor permeable and liquid water
impermeable.
10. The textile laminate as claimed in claim 9 wherein the
hydrophobic membrane comprises a PTFE (polyterafluoroethylene) film
and the polymer fibers are PTFE fibers.
11. The textile laminate as claimed in claim 9 wherein the outer
fabric layer comprises synthetic or natural fibers or blends
thereof
12. The textile laminate as claimed in claim 9 wherein the inner
fabric layer comprises cotton, wool, felt, synthetic fibers, or a
combination thereof.
13. The textile laminate as claimed in claim 9 wherein the inner
fabric layer comprises a hydrophilic material with high
hydrophilicity and rewetting properties to provide a rapid water
absorption ability and improve a water diffusion ability of the
textile laminate.
14. A garment formed of the textile laminate as claimed in claim 9
wherein the inner fabric layer is an inner side of the garment in
contact with a wearer and the outer fabric layer is an outer side
of the garment exposed to the environment.
Description
[0001] This application is a Divisional of co-pending application
Ser. No. 10/932,007 filed on Sep. 2, 2004, and for which priority
is claimed under 35 U.S.C. .sctn. 120, and this application claims
priority of Application No. 92/215,858 filed in Taiwan on Sep. 2,
2003 under 35 U.S.C. .sctn. 119; the entire contents of all are
hereby incorporated by reference.
BACKGROUND
[0002] The present invention relates to a textile laminate and a
method of fabricating the same, and more particularly, to a
waterproof and breathable textile laminate and fabrication method
thereof.
[0003] A wide variety of air and water vapor permeable materials
have been developed for different purposes. For example, these
materials can be used in filtration, separation, and apparel. U.S.
Pat. No. 5,928,582, for example, discloses a method of forming a
microporous membrane that utilizes an ultraviolet irradiation
process to form microsphereulites, followed by a thermally-induced
phase separation, yielding microporous membranes that have improved
flow and mechanical properties. In U.S. Pat. No. 4,194,041, Gore et
al. disclose a waterproof laminate for use in constructing sport
apparel having air and water vapor permeability with liquid water
resist properties.
[0004] Breathable waterproof laminates are particularly
advantageous in traditional waterproof textile fabric applications,
such as garments. A garment formed of conventional waterproof
textile fabric can prevent environmental water, such as rain, from
entering the garment, but often tends to be uncomfortable to the
wearer, as moisture, such as perspiration, cannot evaporate through
the garment. The moisture generally remains trapped in the
garment.
[0005] Continuous development of the waterproof material has
greatly improved breathability of the waterproof garments.
Breathable waterproof material is a microporous film comprising a
plurality of pores with a size about 1/20000 of liquid water
droplets and 700 times that of water vapor. Thus, breathable
waterproof material can prevent water from penetration while
allowing air and water vapor to escape.
[0006] Typically, the waterproof textile laminate for a garment
includes a plurality of layers for various functions, such as a
fabric layer with thermal regulative property. Accordingly,
adhesive agents are required during the manufacturing process to
combine these multiple layers. In order to avoid delamination, the
adhesive agent must be coated over a majority of each layer. Most
adhesive agents, however, are hydrophobic and have very low water
permeability, leading to significant deterioration of the water
vapor permeability of the textile laminate as the water vapor
cannot pass through the adhesive agents. In other words, the
breathable ability of a garment is still limited. For example, when
massive perspiration is generated due to heavy sport or a high
temperature, the perspiration remains on a wearer's body until the
perspiration evaporated through the breathable textile laminate
gradually. This evaporation process typically takes long time and
makes the wearer feels wet and uncomfortable.
[0007] In U.S. Pat. No. 5,660,918, Dutta et al. disclose a grid
pattern of an adhesive layer for bonding a fabric layer and a
hydrophilic layer. The improvement of water permeability, however,
is very limited. Thus, a new waterproof textile laminate with high
water vapor permeability is desirable.
SUMMARY
[0008] Embodiments of the invention provide a waterproof textile
laminate and a method of fabricating the same to solve the
aforementioned problems.
[0009] Accordingly, a textile laminate comprising a hydrophobic
membrane, an inner fabric layer, and an outer fabric layer is
provided. The hydrophobic membrane has a plurality of tangled
polymer fibers, a plurality of pores among the polymer fibers, and
a plurality of adhesive powders attached on the polymer fibers on
the top surface and the bottom surface for bonding the outer fabric
layer and the inner fabric layer to the top surface and the bottom
surface of the hydrophobic membrane. The grain size of each
adhesive powder is small enough to remain the pores, but leave the
pores unobstructed. The pores in the PTFE film are large enough to
allow permeation of while blocking liquid water.
[0010] In accordance with an embodiment of the fabrication method
of the invention, a hydrophobic membrane with a top surface and a
bottom surface is first provided. The hydrophobic membrane has a
plurality of tangled polymer fibers and a plurality of water
impermeable pores among the polymer fibers. A plurality of adhesive
powders are then applied to the polymer fibers on the top surface
and the bottom surface uniformly utilizing static to spread the
adhesive powders. A grain size of each adhesive powder is small
enough to cling to the polymer fibers without obstructing the
permeability of the hydrophobic membrane. Thereafter, an outer
fabric layer and an inner fabric layer sandwich the hydrophobic
membrane, secured by the adhesive powders.
[0011] Further scope of the applicability of the present invention
will become apparent from the detailed description given
hereinafter. However, it should be understood that the detailed
description and specific examples, while indicating preferred
embodiments of the invention, are given by way of illustration
only, since various changes and modifications within the spirit and
scope of the invention will become apparent to those skilled in the
art from this detailed description
DESCRIPTION OF THE DRAWINGS
[0012] The present invention will become more fully understood from
the detailed description given hereinbelow and the accompanying
drawings which are given by way of illustration only, and thus are
not limitative of the present invention, and wherein:
[0013] FIG. 1 is a schematic diagram of a textile laminate
according to an embodiment of the invention;
[0014] FIG. 2 is a schematic diagram of a hydrophobic membrane in
FIG. 1;
[0015] FIG. 3 is a locally enlarged view of the hydrophobic
membrane in FIG. 2;
[0016] FIG. 4 is a schematic diagram of the waterproof and
breathable mechanism of textile laminate; and
[0017] FIG. 5 is a schematic diagram of a garment fabricated
according to an embodiment of the invention.
DETAILED DESCRIPTION
[0018] FIG. 1 is a schematic diagram of a textile laminate 100
according to an embodiment of the invention. As shown in FIG. 1,
the textile laminate 100 comprises an outer fabric layer 110, a
hydrophobic membrane 120, and an inner fabric layer 130 stacked in
sequence.
[0019] In this embodiment of the invention, the outer fabric layer
110 can comprise cloth materials capable of supporting and
enhancing the strength of the textile laminate 100, such as
synthetic or natural fibers or blends thereof. The outer fabric 110
can comprise windproof or thermally insolating properties or
additional functions according to requirements. Preferably, the
outer fabric layer 110 is a fabric layer comprising polyester
fibers, nylon fibers, or natural fibers, such as wool, cotton, or
T/C blended yarns.
[0020] FIG. 2 is a schematic diagram of the hydrophobic membrane
120 in FIG. 1. FIG. 3 is a locally enlarged diagram of an area "A"
enclosed by a dotted line in FIG. 2. As shown in FIG. 2 and FIG. 3,
the hydrophobic membrane 120 with a top surface 122a and a bottom
surface 122b comprises a plurality of tangled polymer fibers 124, a
plurality of pores 126 among the polymer fibers 124, and a
plurality of adhesive powders 128 distributed on the polymer fibers
124 on the top surface 122a and the bottom surface 122b. Thus, the
outer fabric layer 110 and the inner fabric layer 130 can be bonded
by the adhesive powders 128 to the top surface 122a and the bottom
surface 122b of the hydrophobic membrane 120 respectively.
[0021] Each pore 126 has an irregular shape and a size about
1/20000 of liquid water droplets and 700 times that of water vapor.
Thus, liquid water is prevented from while air and water vapor are
allowed to escape. Note that the grain size of each adhesive powder
128 is small enough to remain the pores 126 unobstructed. Thus, the
adhesive powder 128 can securely bond the outer fabric layer 110
and inner fabric layer 130 without reducing humidity transmission
of the hydrophobic membrane 120. Preferably, the hydrophobic
membrane 120 comprises a PTFE (polyterafluoroethylene) film and the
polymer fibers 124 are PTFE fibers, but are not limited thereto.
The grain size of adhesive powder 128 is about 50 to 500 nm.
[0022] The inner fabric layer 130 is formed of a hydrophilic
material bonded on the bottom surface 122b of the hydrophobic
membrane 130 by adhesive powders 128. Preferably, the inner fabric
layer 130 comprises improved polyester fibers with negative ion
groups. The inner fabric layer 130 can be formed of other
materials, such as cotton, wool, felt, synthetic fibers, or a
combination thereof.
[0023] Furthermore, in one embodiment of the invention, the inner
fabric layer 130 is formed of a hydrophilic material with enhanced
hydrophilicity and rewetting properties, such as aliphatic
polyamide or polyester polymers with appropriate hydrophilic add-on
agents or coatings. Preferably, the inner fabric layer 130
comprises AKWATEKR polyester fibers produced by Comfortable
Technologies, Inc. The properties and fabrication method of
AKWATEKR polyester fibers is shown in U.S. Pat. No. 5,408,012. In
this embodiment, the inner fabric layer 130 has high hydrophlicity,
rewetting, and thermal regulative properties. It can provide a high
water absorption ability to remove water or perspiration from a
wearer rapidly, improve a water diffusion ability of the textile
laminate 100, and make the wearer dry and comfortable.
[0024] Embodiments of the invention additionally provides a method
of fabricating the aforementioned textile laminate 100. According
to the method of this embodiment, the inner fabric layer 130 and
the outer fabric layer 110 are first subjected to a pretreatment,
such as dyeing, according to product requirements. A hydrophobic
membrane 120 with a top surface 122a and a bottom surface 122b is
then provided. The hydrophobic membrane 120 has a plurality of
tangled polymer fibers 124 and a plurality of pores 126 among the
polymer fibers 124. Pores 126 have irregular shapes and sizes about
1/20000 of liquid water droplets and 700 times that of water vapor.
Thus, the hydrophobic membrane 120 is permeable for water vapor but
impermeable for liquid water.
[0025] Thereafter, a plurality of adhesive powders 128 are attached
to the polymer fibers 124 on both surfaces 122a and 122b of the
hydrophobic membrane 120. Preferably, the adhesive powders 128 are
spread uniformly over the entirety of both surfaces. The adhesive
powders 128, however, can be also disposed in a specific pattern
according to product requirements.
[0026] Note that although the preparation of the adhesive powders
with small grain sizes is not problematic for one skilled in the
art, the adhesive powders tend to aggregate themselves together and
are difficult to separate when the grain sizes of the adhesive
powders 128 are extremely small, such as 50 to 500 nm. Put simply,
if the adhesive powders 128 are directly attached to the
hydrophobic membrane 120 without an additional dispersal process,
clusters of the aggregated adhesive powders 128 will jam the pores
126 on the top and bottom surfaces 122a and 122b of the hydrophobic
membrane 120.
[0027] To prevent this problem, a static force is utilized to
disperse the adhesive powders 128 and uniformly attach them on both
surfaces of the hydrophobic membrane 120. Accordingly, static
charges with a first type are applied to the adhesive powders 128
and static charges of a second type are applied to the polymer
fibers 124 on the top surface 122a and the bottom surface 122b of
the hydrophobic membrane 120. As a result, the aggregated adhesive
powders 128 are separated from each other due to the repellant
force and attached to the top surface 122a and the bottom surface
122b of the hydrophobic membrane 120 due to the attracting force.
In addition, since the grain size of each adhesive powder 128 is
small enough in comparison with the size of the polymer fibers 124
and the pores 126, the pores 126 remain unobstructed after the
adhesive powders 128 are attached to the hydrophobic membrane
120.
[0028] The outer fabric layer 110 and the inner fabric layer 130
then sandwich the top surface 122a and the bottom surface 122b of
the hydrophobic membrane by the adhesive powders 128 on the both
surfaces of the hydrophobic membrane 120.
[0029] FIG. 4 is a schematic diagram of the waterproof and
breathable mechanism of the textile laminate 100 of an embodiment
of the invention. As shown in FIG. 4, due to the waterproof
characteristics of the hydrophobic membrane 120, liquid water 140
penetrating from the upper side of textile laminate 100 will be
blocked by the outer fabric layer 110 and the hydrophobic membrane
120 and thereby preventing permeation of the textile laminate
100.
[0030] Conversely, due to the high hydrophilic and rewetting
ability of the inner fabric layer 130, the humidity or water 150 on
the inner fabric layer 130 is absorbed rapidly by the inner fabric
layer 130 and then evaporated upward through the hydrophobic
membrane 120. In addition, due to a presence of the inner fabric
layer 130 with a high diffusion rate, generated perspiration is
absorbed from a wearer's body in a very short time, making the
wearer dry and comfortable. The evaporating rate through the
hydrophobic membrane 120 can be further enhanced, leading to make a
wearer more dry and comfortable. In this case, the waterproof
textile laminate is not only waterproof, but also has high
rewetting ability since the inner fabric layer 130 can absorb water
or perspiration from the body of a wearer and assists in
evaporation through the breathable waterproof layer.
[0031] A test sample according to an embodiment of the invention is
tested in China Textile Institute. Table 1 shows the diffusion
ability and an evaporation rate of the test sample. Table 2 shows
the moisture picking ability. Table 3 shows the water resistance
hydrostatic pressure and moisture permeability. According to the
testing result of China Textile Institute, the moisture
permeability of the sample of the textile laminate 100 is over
10000 g/m.sup.2-24 hr and the water resistant ability based on the
water pressure method is over 10000 mm. It shows a great waterproof
ability and an excellent breathable ability. In addition, the dry
effect, diffusion ability, and moisture picking ability tests show
high water absorption ability of the invention. It means generated
perspiration can be absorbed from a wearer's body in a very short
time, making the wearer dry and comfortable. TABLE-US-00001 TABLE 1
Test Items Test Results Testing Methods Water Resistance Over 10000
JIS L1092-1992 Hydrostatic 5.1.2B Pressure (mm) Moisture 10016 JIS
L1099-1993 A-1 Permeability (CaCl.sub.2)40.degree. C. * 90% RH
(g/m.sup.2-24 hr)
[0032] TABLE-US-00002 TABLE 2 Testing Testing Item Testing Results
Method 5 sec 10 sec 20 sec 30 sec 60 sec 90 sec Diffusion 951 1568
2464 2659 2784 2798 Diffusion ability Area method of (mm.sup.2)
China Textile Institute 10 min 20 min 40 min 60 min 80 min 100 min
Remained 71.4 46.0 1.3 0.3 0.2 0.1 Drying effect Water method of
Ratio (%) China Textile Institute
[0033] TABLE-US-00003 TABLE 3 Testing Testing Item Results Testing
Methods Moisture Picking 21.15 Moisture picking Ratio (%) ability
method of China Textile Institute
[0034] An embodiment of the present invention further provides a
garment comprising the aforementioned textile laminate. FIG. 5 is a
schematic diagram of a garment 200 comprising the textile laminate
100. For clarity, the garment manufacturing method is omitted
herein as it is well-known for those skilled in the art and not
directly related to the invention.
[0035] As shown in FIG. 5, the outer fabric layer 110 of the
textile laminate 100 is located on an outer side of the garment 200
and the inner fabric layer 130 of the textile laminate 100 is
located on an inner side of the garment 200 adjacent to the wearer.
Thus, it is more comfortable for the wearer since the perspiration
generated from the wearer can be rapidly absorbed by the high
hydrophilic inner fabric layer 130 and evaporated through the
hydrophobic membrane 120 and the outer fabric layer 130.
Additionally, the liquid water from the environment, such as rain
or snow, cannot pass through the garment 200 to the wearer's body
due to the waterproof ability of the textile laminate 100.
[0036] The invention provides a new textile laminate structure and
a method of fabricating the same. According to the invention, the
method of combining the outer fabric layer 110, the hydrophobic
membrane 120, and the inner fabric layer 130 does not reduce the
humidity transmission of the hydrophobic membrane 120
substantially. Furthermore, the invention provides a laminate
structure having a hydrophobic membrane, and an inner fabric layer
with high hydrophilicity and rewetting properties. Thus, the
humidity transmission of the textile laminate can be improved
significantly, leading to a more comfortable garment.
[0037] The invention being thus described, it will be obvious that
the same may be varied in many ways. Such variations are not to be
regarded as a departure from the spirit and scope of the invention,
and all such modifications as would be obvious to one skilled in
the art are intended to be included within the scope of the
following claims.
* * * * *