Field of the Invention
[0001] The present invention relates to a woven or knitted fabric and clothes containing
crimped composite filaments and having an air permeability which increases when the
fabric is wetted with water or, for example, sweat. Particularly, the present invention
relates to a woven or knitted fabric comprising composite filaments comprising a polyester
component and a polyamide component bonded together in a side-by-side or eccentric
core-sheath type structure, and having manifested crimps. Moreover, the present invention
relates to a woven or knitted fabric and clothes having an air permeability which
reversibly and efficiently increases when the fabric is wetted with water, in comparison
with that upon drying.
[0002] It has been known that a woven or knitted fabric containing crimped synthetic filaments
can be used for sportswear such as skiwear, windbreakers and outdoor wear, and outerwear
such as raincoats and men and women's coats, etc.
[0003] However, when the above-mentioned conventional woven or knitted fabric is wetted
with water or, for example, by sweat, problems that the fabric sticks to the skin
to make the wearer feel uncomfortable, and the drying speed is slow, occur.
[0004] In order to solve the above problems, an air-permeable self-adjusting type woven
or knitted fabric having an air permeability that is increased by wetting with water
and that is decreased by drying has been proposed. When one wears clothes prepared
from the conventional woven or knitted fabric, and the clothes are wetted with sweat,
the air permeability of the clothes increases so as to rapidly remove the water remaining
in the clothes to dry the clothes. Moreover, the air permeability of the clothes decreases
after drying to increase the warmth-retaining effect of the clothes. Therefore, good
wearability of the clothes can always be maintained regardless of whether the wearer
sweats or not.
[0005] For example,
Japanese Unexamined Patent Publication (Kokai) No. 2003-41462 (Patent Reference 1) discloses an air permeable self-adjusting type woven or knitted
fabric comprising composite filaments (A) in which a modified poly(ethylene terephthalate)
containing a sulfonate group and a nylon are bonded together in a side-by-side type
structure, and filaments (B) the dimensions of which do not substantially change even
when the humidity changes. Although the air permeability of the woven or knitted fabric
is reversibly increased upon wetting with water in comparison with that upon drying,
an amount of change in air permeability is practically insufficient.
[0006] Furthermore,
Japanese Unexamined Patent Publication (Kokai) No. 10-77544 (Patent Reference 2) discloses a woven or knitted fabric comprising 30% by weight
or more of synthetic multifilaments yarn which is formed from a moisture-absorbent
polymer (for example, copolymerized polyester polymers in which a hydrophilic compound
is copolymerized and a polyether ester amide polymers) and which is one heat-treated
so that the yarn has a twist multiplier of 6,800 to 26,000.
[0007] Still furthermore,
Japanese Unexamined Patent Publication (Kokai) No. 2002-180323 (Patent Reference 3) discloses a woven or knitted fabric formed from cellulose acetate
filaments (having a percentage of crimp less than 10% at a humidity of 95% RH or more,
and a percentage of crimp of 15 to 20% and a number of crimps of 25/25.4 mm at a humidity
of 65%, and a percentage of crimp of 20% or more at a humidity of 45% RH or less.
[0008] The woven or knitted fabrics disclosed in Patent References 1 and 2 exhibit an air
permeability which increases upon absorbing moisture. However, the extent of the change
in air permeability is practically insufficient and, thus, an air permeable self-adjusting
woven or knitted fabric having a still larger change in air permeability has been
desired.
Disclosure of the Invention
[0012] An object of the present invention is to provide a woven or knitted fabric comprising
crimped composite filaments and having an air permeability which increases when the
fabric is wetted with water and clothes containing the woven or knitted fabric, the
woven or knitted fabric and clothes having an air permeability which increases to
an adequately high degree for practical use upon being wetted with water in comparison
with that upon drying.
[0013] The woven or knitted fabric of the present invention comprises a yarn comprising
composite filaments formed from a polyester resin component and a polyamide resin
component different from each other in thermal shrinkage and bonded together in a
side-by-side structure or in an eccentric core-in-sheath structure, and has crimps
manifested by heat treatment applied thereto, the crimped composite filaments being
contained in a content of 10 to 100% by mass in the woven or knitted fabric, and satisfying
the following requirement:
wherein DC
F represents a percentage of crimp of a sample of crimped composite filaments taken
from the woven or knitted fabric, determined by leaving the sample to stand for 24
hours in a test environment at a temperature of 20°C at a humidity of 65% RH to dry
and HC
F represents a percentage of crimp of another sample of the taken crimped composite
filaments, determined by immersing the other sample in water at a temperature of 30°C
for 2 hours, pulling up the sample from the water, holding the sample between a pair
of filter paper sheets in the ambient atmospheric air at a temperature of 30°C at
a humidity of 90% RH within 60 sec after pulling up the sample, leaving the sample
under a pressure of 0.69 mN/cm
2 for 5 seconds to lightly wipe water from the sample, whereby the woven or knitted
fabric exhibit an air permeability which increases when the fabric is wetted with
water.
[0014] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the polyester resin component comprises a modified polyester resin in
which, 5-sodiosulfoisophthalic acid is copolymerized in an amount of 2.0 to 4.5 molar
% based on the content of the acid component.
[0015] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the yarn comprising the crimped composite filaments has a number of twists
of 0 to 300 turns/m.
[0016] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the woven or knitted fabric contains the crimped composite filaments and
other filaments different from the crimped composite filaments.
[0017] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the other filaments are selected from non-crimped filaments or filaments
showing a difference in percentage of crimp DC
F - HC
F of 10% or less.
[0018] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, when the woven or knitted fabric comprising the crimped composite filaments
is subjected to determination of the stretchability of a stretchable woven fabric
in accordance with JIS L1096, 8.14.1 (Method B, except that the load value applied
to a sample woven or knitted fabric test piece is altered to 1.47 N, where the woven
or knitted fabric is a woven fabric, a stretchability of the woven fabric in at least
one direction selected from the warp direction and the weft direction is 10% or more,
and where the woven or knitted fabric is a knitted one, the stretchability of the
knitted fabric in at least one direction selected from the course direction and the
wale direction is 10% or more.
[0019] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the woven or knitted fabric comprising the crimped composite filaments
has a multi-ply structure, and at least one ply thereof comprises the crimped composite
filaments in an amount of 30 to 100 mass% based on the weight of the ply.
[0020] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the woven or knitted fabric is a knitted fabric having a tubular knitted
stitch, and the loop of the tubular knitted stitch is formed from a yarn comprising
the crimped composite filaments and the other filaments.
[0021] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the woven or knitted fabric is a woven fabric, the yarn containing composite
filaments is a doubled yarn of the crimped composite filaments and the other or the
warp filaments, and the warp and weft yarns or the warp or weft yarn of the woven
fabric is constituted from a doubled yarn of the crimped composite filaments and the
other filaments.
[0022] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the yarns composed of the crimped composite filaments and the yarn composed
of the other filaments are alternately arranged with one each other in at least one
direction selected from the warp direction and the weft direction, or in at least
one direction selected from the course direction and the wale direction.
[0023] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, from the crimped composite filaments and the other filaments, a core-sheath
composite yarn is formed, the core portion of the composite yarn is formed from the
crimped composite filaments, and the sheath portion is formed from the other filaments.
[0024] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the other filaments are selected from polyester filaments.
[0025] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the woven or knitted fabric is one treated with a water-absorbing agent.
[0026] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the woven or knitted fabric is one treated with a water-repellent treatment.
[0027] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water, the woven or knitted fabric is dyed.
[0028] In the woven or knitted fabric of the present invention comprising crimped composite
filaments and having an air permeability which increases when the fabric is wetted
with water,
[0029] when a dried sample is prepared by leaving a test sample of the woven or knitted
fabric to stand for 24 hours in an environment at a temperature of 20°C at a humidity
of 65% RH, separately a water-wetted sample is prepared by immersing a test sample
of the woven or knitted fabric in water at a temperature of 30°C for 2 hours, pulling
up the test sample from the water, holding the test sample between a pair of filter
paper sheets in the ambient atmospheric air at a temperature of 30°C at a humidity
of 90% RH within 60 seconds after pulling up the test sample, and leaving the test
sample under a pressure of 490 N/m
2 (50 kgf/m
2) for 1 minute to lightly remove water from the test sample, and the air permeabilities
of the dried sample and the water wetted sample are determined in accordance with
JIS L 1096-1998, 6.27.1, Method A, (fragile type air permeability testing machine
method) a rate of change in air permeability of the woven or knitted fabric calculated
in accordance with the following equation:
is 30% or more.
[0030] Clothes comprising the woven or knitted fabric of the present invention comprising
the crimped composite filaments and having dimensions which are reversibly enlarged
when the fabric is wetted with water to increase the air permeability thereof.
[0031] In the clothes of the present invention, at least one of the flank, the side, the
breast, the back and the shoulder of the clothes is formed from the woven or knitted
fabric comprising the crimped composite filaments.
[0032] In the clothes of the present invention, each of the portions of the clothes formed
from the woven or knitted fabric comprising the crimped composite filaments has an
area of 1 cm
2 or more.
[0033] In the clothes of the present invention, the woven or knitted fabric comprising the
crimped composite filaments is selected from tubular knitted fabrics and mesh-like
coarse woven or knitted fabrics.
[0034] The clothes of the present invention, are selected from outerwear, sportswear and
underwear.
[0035] The crimped composite filaments contained in the woven or knitted fabric of the present
invention have a characteristic property that the percentage of crimp of the filaments
decreases 10% or more upon wetting with water in comparison with one upon drying.
The woven or knitted fabric containing the crimped composite filaments therefore exhibits
a significantly increased air permeability upon wetting with water in comparison with
one upon drying. Accordingly, in the case where the woven or knitted fabric containing
a crimped composite filaments of the present invention is used as a material for forming
whole or a part of outerwear, sportswear or underwear, when the clothes a wearer wears
are wetted with water, for example, due to wearer's sweating, the air permeability
of the clothes increases, and the water component retained within the clothes is dried
and released. When the clothes are thus adequately dried, the air permeability decreases,
and the warmth retention is improved. The wearability is therefore always kept excellent,
and the clothes contribute to the maintenance of wearer's good health.
BRIEF DESCRIPTION OF THE DRAWINGS
[0036]
Fig. 1 is an explanatory cross-sectional view showing an example of the cross-sectional
profile of a side-by-side type crimped composite filament contained in the woven or
knitted fabric of the present invention.
Fig. 2 is an explanatory cross-sectional view showing another example of the cross-sectional
profile of a side-by-side type crimped composite filament contained in the woven or
knitted fabric of the present invention.
Fig. 3 is an explanatory cross-sectional view showing still another example of the
cross-sectional profile of a side-by-side type crimped composite filament contained
in the woven or knitted fabric of the present invention.
Fig. 4 is an explanatory cross-sectional view showing one example of the cross-sectional
profile of an eccentric core-in-sheath type crimped composite filament contained in
the woven or knitted fabric of the present invention.
Fig. 5 is an explanatory front view of clothing (a shirt) in which a plurality of
portions formed from the woven or knitted fabric of the present invention having an
air permeability which increases when the fabric is wetted with water are arranged
on the front of the clothes.
Fig. 6 is an explanatory front view of clothing (a shirt) in which a single portion
formed from the woven or knitted fabric of the present invention having an air permeability
which increases when the fabric is wetted with water is arranged on the front of the
clothes.
Fig. 7 is an explanatory front view of clothing (a shirt) having an undersleeve portion
and a side portions formed from the woven or knitted fabric of the present invention
having an air permeability which increases when the fabric is wetted with water.
Fig. 8 is a graph showing a change in relative humidity in a gap between the skin
and clothing (a shirt) during wearing of the present invention (Example 1) and comparative
clothes (shirt) falling outside the scope of the present invention (Comparative Example
1)), when the clothes are worn and subjected to the following wearing test procedures
containing rest (with wind at 1.5 m/sec) → running → rest (without wind) → rest (with
wind at 1.5 m/sec).
Best Mode for Carrying Out the Invention
[0037] The crimped composite filaments contained in the woven or knitted fabric of the present
invention having an air permeability which increases when the fabric is wetted with
water is formed from a polyester resin component and a polyamide component, and has
a side-by-side type or an eccentric core-in-sheath type composite filament structure.
[0038] For a side-by-side type composite filament having, for example, an approximately
circular cross-sectional profile as shown in Fig. 1, a section 1 comprising a polyester
resin component and a section 2 comprising a polyamide resin component are bonded
together with a side-by-side relationship, and extend along the longitudinal axis
of the composite filament to form an integral composite filament.
[0039] For a side-by-side type composite filament as shown in Fig. 2, the cross-sectional
profile is elliptic, and a section 1 and a section 2 are preferably bonded together
approximately along the major axis of the elliptic cross-sectional profile.
[0040] For a side-by-side type composite filament having a cross-sectional profile as shown
in Fig. 3, a section 1 comprising a polyester resin component and a section 2 comprising
a polyamide resin component 2 are bonded together in such a manner that part of the
peripheral face 2a of the section 2 is exposed to the outside and the remaining peripheral
face portion is bonded to the section 1.
[0041] In Fig. 3, the section 1 showing a crescent shape comprises of a polyester resin
component, and the section 2 showing an approximately elliptic cross-sectional profile
comprises a polyamide resin component. However, the section 1 may also be composed
of a polyamide resin component, and the section 2 may also be composed of a polyester
resin component.
[0042] For an eccentric core-in-sheath type composite filament having a cross-sectional
profile as shown in Fig. 4, a section 2 comprising a polyamide resin component is
included in a section 1 comprising a polyester resin component, and the peripheral
face of the section 2 is never exposed to the outside. The central point 1a of the
section 1 never agrees with the central point 2b of the section 2, and the central
points 1a and 2b are apart from each other.
[0043] The cross-sectional contour of a composite filament contained in the woven or knitted
fabric of the present invention is not restricted to those as shown in Figs. 1 to
4. The shape may be triangular, quadrangular, polygonal, etc., or it may be internally
hollow.
[0044] For a side-by-side type composite filament and an eccentric core-in-sheath type composite
filament, the polyester resin component and the polyamide resin component are different
in thermal shrinkage from each other. As a result, an amount of thermal shrinkage
of the section 1 and one of the section 2 produced when the composite filament is
heated, are different from each other, and crimp of the composite filament are manifested.
[0045] In the cross-sectional profile of the composite filament in the present invention,
the mass ratio, of the section 1 to the section 2 that are bonded together, is preferably
from 30:70 to 70:30, more preferably from 40:60 to 60:40.
[0046] The polyester resin component comprises a polycondensation product of an acid component
comprising at least one aromatic dicarboxylic acid, and a diol component comprising
at least one alkylene glycol.
[0047] The acid component preferably comprises terephthalic acid, as a major component.
The diol component preferably contains, as a major component, ethylene glycol, propylene
glycol, butylene glycol, etc. The polyester resin component preferably comprises,
as a copolymerization component, a compound having at least one functional group selected
from an alkali metal sulfonate group, an alkaline earth metal sulfonate group and
a phosphonium salt group. That is, the polyester resin component preferably comprises
a modified polyester, for example, a poly(ethylene terephthalate) copolymer, a poly(propylene
terephthalate) copolymer or a poly(butylene terephthalate) copolymer containing, as
a copolymerization component, an aromatic dicarboxylic acid having, as a functional
group, the sulfonic acid salt group as mentioned above. The above compounds for copolymerization
each having a sulfonic acid salt group contribute to improving an adhesive property
of the polyester resin component thus obtained to the polyamide resin component.
[0048] The poly(ethylene terephthalate) copolymer modified with the copolymerization component
containing a sulfonic acid salt group is particularly preferably used as the polyester
resin component of the crimped composite filament for the woven or knitted fabric
of the present invention, because it has an excellent flexibility and a low polymer
price.
[0049] Examples of the aromatic dicarboxylic acid having a sulfonic acid salt group include
5-sodium sulfoisophthalic acid and its ester derivatives and 5-phosphnium isophthalic
acid and its ester derivatives. Moreover, examples of the hydroxyl compound containing
a sulfonate group include sodium p-hydroxybenzenesulfonate. Among these compounds,
5-sodium sulfoisophthalic acid is preferably used. The content of the above copolymerization
component is preferably from 2.0 to 4.5 molar % based on a molecular amount of the
acid component of the polyester polymer containing the copolymerization component.
When the content of the copolymerization content is less than 2.0 mol%, the resultant
composite filaments exhibits a sufficient crimping property, while the section composed
of the polyester resin component and the section composed of the polyamide resin component
may be separated at the interface between them from each other. Moreover, where the
content of the above copolymerization component exceeds 4.5 molar %, and when the
resultant undrawn composite filaments are drawn and heat-treated, crystallization
of the section composed of the resultant polyester resin component insufficiently
proceeds, and thus it becomes necessary to increase the drawing and heat treatment
temperature, and the increased temperature causes breakages, of the resultant yarns,
which often occur during the drawing and heat treatment procedures.
[0050] There is no restriction on the type of the polyamide resin used as the polyamide
resin component as long as it has an amide bond in the principal chain and it has
fiber forming property. Examples of the polyamide resin include nylon 4, nylon 6,
nylon 66, nylon 46 and nylon 12. Among these resins, nylon 6 and nylon 66 are preferably
used in the present invention in view of the excellent flexibility, its relatively
low polymer price and the high stability in production step of the polyamide resin.
[0051] The polyester resin component and the polyamide resin component may be respectively,
independently from each other and optionally contain at least one type of additives
selected from pigments, delustering agents, stain-proofing agents, fluorescent brighteners,
flame retardants, stabilizers, antistatic agents, light-resistant agents and UV absorbers.
[0052] There is no specific restriction on the thickness of individual filaments in the
composite filaments and the number of individual filaments contained in one yarn.
However, the thickness of the individual filaments is preferably in the range of from
1 to 10 dtex, more preferably from 2 to 5 dtex. The number of composite filaments
contained in one yarn of the composite filaments is preferably from 10 to 200, more
preferably from 20 to 100.
[0053] Furthermore, in the composite filaments contained in the woven or knitted fabric
of the invention, the polyamide resin section formed from the polyamide resin component
has a higher thermal shrinkage and a higher moisture absorption self-elongation than
those of the polyester resin section formed from the polyester resin component.
[0054] Consequently, when the composite filaments usable for the present invention having
a side-by-side or eccentric core-in-sheath type composite filament structure are heated,
the polyamide resin section shrinks greater than the polyester resin section. As a
result, the composite filament manifests a crimped structure wherein the resin section
having a larger shrinkage amount is situated inside, and the resin section having
a smaller shrinkage amount is situated outside. When the yarn containing a non-crimped
composite filament is heated to manifest crimps in the resultant composite filaments,
the resultant yarn containing crimped composite filaments has a higher bulkiness and
a shorter apparent yarn length than those of the non-crimped composite filament yarn.
[0055] When a crimped composite filament used in the present invention is wetted with water,
the polyamide resin section in the crimped composite filament absorbs a larger amount
of water than that of the polyester resin section, and exhibits a larger self-elongation.
(In general, the self-elongation of the polyester resin section caused by water wetting
is close to zero.) As a result, the percentage of crimp of a water-wetted crimped
composite filament becomes lower than that of a dried crimped composite filament;
the apparent length of the water-wetted crimped composite filament becomes greater
than that of the dried crimped composite filament. Moreover, when the water-wetted
crimped composite filament is dried, the polyamide resin section is dehydrated and
shrunk. However, because the polyester resin section has substantially no dimensional
change, the percentage of crimp of the dried crimped composite filament recovers to
the initial one, and the apparent length thereof recovers to the initial one.
[0056] As explained above, in the crimped composite filament contained in the woven or knitted
fabric of the invention, the percentage of crimp decreases upon being wetted with
water, and the apparent length of the filament increases. The percentage of crimp
and the apparent length of the crimped composite filament recover the initial ones
upon drying. In the woven or knitted fabric formed from yarns containing crimped composite
filaments having the above properties, the percentage of crimp of the crimped composite
filaments decreases upon being wetted with water. As a result, the length of the crimped
composite filament-containing yarn increases; a gap between yarns in the woven or
knitted fabric increases; the area of the fabric increases; and the air permeability
of the fabric increases.
[0057] The air permeability of the woven or knitted fabric can be determined in accordance
with JIS L 1096-1998, 6.27.1. A Method (Fragile type air permeability testing machine
method).
[0058] In the woven or knitted fabric containing a crimped composite filaments of the present
invention, it is important that the air permeability upon being wetted with water
be higher than that upon drying. Preferably the air permeability upon being wetted
with water is 30% or more, more preferably 80 to 500% higher than that upon drying.
[0059] A change (%) in air permeability is calculated from the following equation:
wherein the dried sample is prepared by leaving a test sample of the woven or knitted
fabric to stand for 24 hours in an environment at a temperature of 20°C at a humidity
of 65% RH, separately the water wetted sample is prepared by immersing a test sample
of the woven or knitted fabric in water at a temperature of 30°C for 2 hours, pulling
up the test sample from the water, holding the test sample between a pair of filter
paper sheets in the ambient air at a temperature of 30°C at a humidity of 90% RH within
60 seconds after pulling up the test sample, and leaving the test sample under a pressure
of 490 N/cm
2 (50 kgf/m
2) for 1 minute to lightly remove water in the test sample.
[0060] For clothes having a rate of change in air permeability of less than 30%, the air
permeability of the clothes become insufficient when the wearer wears the clothes
containing the water-wetted woven or knitted fabric and sweats. The clothes then cause
the wearer to feel increased stuffiness or sultriness.
[0061] The woven or knitted fabric of the present invention contains the crimped composite
filaments in a content of 10 to 100 mass%, and the content is preferably from 40 to
100 mass%. When the content is less than 10 mass%, the effect of the crimped composite
filaments, namely, a reversible change between an increase and decrease in air permeability
caused by wetting with water and drying of the woven or knitted fabric thus obtained
becomes insufficient.
[0062] For the woven or knitted fabric of the present invention, the crimped composite filament
is contained in yarns for forming the woven or knitted fabric. The percentage of crimp
of the crimped composite filaments decreases upon wetting with water, whereby the
apparent length of the yarn containing the crimped composite filament increases. As
a result, the area of the woven or knitted fabric increases so as to increase the
openings between yarns. Consequently, the air permeable opening area and the air permeability
increase.
[0063] In order to enable the crimped composite filament-containing yarn to increase or
decrease the apparent length thereof with a high efficiency, in response to a decrease
or an increase of the crimping property of the crimped composite filaments and, thereby,
the air permeability of the woven or knitted fabric to increase or decrease with high
efficiency, the yarn is preferably a non-twisted or soft twisted one having a number
of twists of 0 to 300 turns/m, particularly more preferably a non-twisted yarn. When
the number of twists exceeds 300 turns/m, the resultant crimped composite filaments
within the yarn mutually restrict the deformation thereof. Thus, a change in the percentage
of crimp of the composite filaments, upon being wetted with water or drying, is also
restrained and a change in the apparent length of the yarn is also restricted. Therefore,
the change in the air permeability of the woven or knitted fabric may be also restricted.
[0064] In addition, a yarn containing the crimped composite filaments may be subjected to
an air interlacing and/or false twist and crimping treatment. However, in this case,
a number of interlacing among the filaments in the yarn is preferably from about 20
to 60/m.
[0065] The yarn containing crimped composite filaments optionally contains other type of
filaments than the crimped composite filaments. The other filaments can be selected
from non-crimped filaments and filaments having a difference in percentage of crimp
DC
F - HC
F of less than 10%. There is no specific limitation to the type of a polymer for forming
the other filaments. Examples of the polymer include polyesters, for example, poly(ethylene
terephthalate), poly(trimethylene terephthalate) and poly(butylene terephthalate),
polyamides, for example, nylon 6 and nylon 66, polyolefins, for example, polyethylene
and polypropylene, acrylic polymers, p- or m-aramid polymers and modified polymers
of the above mentioned polymers. Moreover, the other filaments may be selected from
such filaments appropriate for clothes as natural fibers, regenerated fibers and semi-synthetic
fibers. Among these filaments, filaments of polyester, for example, poly(ethylene
terephthalate), poly(propylene terephthalate), poly(butylene terephthalate) or modified
polyester in which the above copolymerization component is copolymerized are appropriate
in view of the dimensional stability upon being wetted with water and the compatibility
(filament-combinability, mixed knittability or mixed weavability and dyeability) with
the composite filaments. Moreover, there are no specific restrictions to individual
filament thickness of the other filaments and the number of individual filaments per
yarn. However, in order to enhance the moisture absorption of the woven or knitted
fabric and increase the air permeability of the fabric upon moisture-uptaking, the
individual filament thickness is preferably from 0.1 to 5 dtex (more preferably 0.5
to 2 dtex), and the number of the individual filaments per yarn is preferably from
20 to 200 (more preferably from 30 to 100). In addition, other filaments may be air
interlaced and/or conventionally false twisted and crimped so that the number of interlacing
becomes about 20 to 60/m.
[0066] In the woven or knitted fabric of the present invention, the crimped composite filaments
and the other filaments may respectively constitute at least one type of yarns, and
these yarns may be mixed woven or knitted. Alternatively, the crimped composite filaments
and the other yarn may constitute together a combined yarn, and air combining may
be employed to form the combined yarn. Moreover, the crimped composite filaments yarn
and the other filaments yarn may constitute together a doubled and twisted yarn or
a doubled yarn, or they may also constitute a composite false twisted crimped yarn.
[0067] There is no restriction to the woven or knitted structures and the number of woven
or knitted plies in the woven or knitted fabric of the present invention. The woven
or knitted structures include, for example, weave structures such as plain weave,
twill weave and satin weave, and a knitting stitch such as plain knitting, circular
rib knitting, a tuck float knitting, plating stitch, a dembigh stitch and a half tricot
stitch. Moreover, the above woven or knitted structures may each include a single
ply structure and a multi-ply structure having two or more plies.
[0068] For the woven or knitted fabric of the present invention, in order to ensure the
movability and deformability (crimp-changeability) of the crimped composite filaments
in the woven or knitted fabric, the crimped composite filaments preferably have stretchability
in the warp direction and/or weft direction. The stretchability is preferably 10%
or more (more preferably 20% or more, still more preferably from 25 to 150%).
[0069] Next, for the woven or knitted fabric of the present invention, the composite filaments
contained in the woven or knitted fabric of the invention have a crimped structure
formed by manifesting their latent crimpability. It is important that the composite
filaments satisfy the requirement represented by the following expression:
wherein DC
F (%) is a percentage of crimp of the composite filaments upon drying, and HC
F (%) is a percentage of crimp of the composite filaments upon being wetted with water.
When DC
F - HC
F is less than 10%, the air permeability of the resultant fabric upon being wetted
with water might not efficiently increase, unpreferably, in comparison with that upon
drying.
[0070] The percentage crimp of a crimped composite filament in the woven or knitted fabric
herein is determined by the following procedure. First, a woven or knitted fabric
is left to stand in an atmosphere at 20°C and 65% RH for 24 hours. Small samples (n
= 5) each having dimensions of 30 cm x 30 cm are cut out from the conditioned woven
or knitted fabric in the same direction thereof. Composite filaments are taken out
from each small sample. A load of 1.76 mN/dtex (200 mg de) is applied to the composite
filament sample, and the filament length L0f is determined. One minute after removal
of the load, a load of 0.0176 mN/dtex (2 mg/de) is applied to the filament, and the
filament length L1f is determined. Moreover, the composite filament sample is immersed
in water at 30°C for 2 hours, and then taken out. The sample is held between a pair
of filter paper sheets within 60 sec after taking out, in the ambient air atmosphere
at 30°C and 90% RH, and then a pressure of 0.69 mN/cm
2 is applied to the sample for 5 sec to lightly wipe out water. A load of 1.76 mN/dtex
(200 mg de) is applied to the sample, and the filament length L0f' is determined.
One minute after removal of the load, a load of 0.0176 mN/dtex (2 mg/de) is applied
to the sample, and the filament length L1f' is determined. The percentage of crimp
DC
F (%) upon drying and the percentage of crimp HC
F (%) upon being wetted with water are calculated from the following formula.
The difference (DC
F - HC
F) (%) is calculated from the above DC
F and HC
F values. In addition, n is then 5, and the average values are calculated.
[0071] The woven or knitted fabric of the invention may be subjected to water absorption
treatment. When the woven or knitted fabric is subjected thereto, the air permeability
of the fabric is likely to be improved even with a small amount of sweat. A conventional
water absorption treatment is satisfactory for such a treatment. The following procedure
is exemplified as a preferred water absorption treatment: a water absorption treatment
agent such as a poly(ethylene glycol diacrylate) or its derivative, or a poly(ethylene
terephthalate)-poly(ethylene glycol) copolymer is allowed to adhere in an amount of
0.25 to 0.50% by weight based on the weight of the woven or knitted fabric to the
woven or knitted fabric. Examples of the water absorption treatment method include
a bath treatment method in which a water absorption treatment agent is added to a
dyeing solution during dyeing, and a dipping method in which a woven or knitted fabric
is dipped in a water absorption treatment solution and squeezed with a mangle before
a dry-heat final set, a gravure coating method and screen printing method.
[0072] Furthermore, the woven or knitted fabric of the present invention may be subjected
to a water-repellent treatment. The water-repellent treatment may be a conventional
one. For example, such a method as described in
Japanese Patent Publication No. 3133227 and
Japanese Examined Patent Publication (Kokoku) No. 4-5786 is appropriate. That is, the method comprises mixing a commercially available fluororesin
water repellant (e.g., trade name of Asahi Guard LS 317, manufactured by Asahi Glass
Co., Ltd.) used as a water repellant with a melamine resin (optional component) and
a catalyst to form a treatment agent containing about 3 to 15% by weight of the water
repellant, and treating the surface of the woven or knitted fabric with the treatment
agent at a pickup ratio of about 50 to 90%. Examples of the method of treating the
surface of the woven or knitted fabric with the treatment agent include a padding
method and a spraying method. Of these methods, the padding method is most preferred
because the treatment agent penetrates into the interior of the woven or knitted fabric.
[0073] In addition, the pickup ratio is a proportion (%) of a weight of the treatment agent
to a weight of the woven or knitted fabric (prior to imparting the treatment agent).
[0074] When the water repellency of the woven or knitted fabric after a water repellent
treatment is evaluated in accordance with JIS L 1092 6.2 (Spray Test), it is preferably
evaluated to point 4 or more, more preferably point 5 (highest point).
[0075] For the water-repellent woven or knitted fabric thus obtained, because the percentage
of crimp of the composite filaments contained in the woven or knitted fabric is efficiently
decreases upon wetting with water, the yarn length of the composite filaments increases.
As a result, openings in the woven or knitted fabrics are made large to improve the
air permeability of the fabric. On the other hand, because the percentage of crimp
ratio of the composite filaments increases upon drying, and a yarn length of the composite
filaments is decreased. As a result, the openings in the woven or knitted fabric are
made small to decrease the air permeability of the fabric.
[0076] The woven or knitted fabric of the present invention may be dyed. The conditions
of dyeing will be explained in detail.
[0077] The woven or knitted fabric in the present invention includes the following embodiments:
(1) a woven or knitted fabric having a multiply structure with at least two plies,
and at least one ply containing the crimped composite filaments in an amount of 30
wt.% or more based on the total weight of the filaments from which the ply is formed;
(2) a knitted fabric having a tubular knitting structure in which the loops of the
tubular stitch are formed from yarns containing the composite filaments and the other
filaments; (3) a woven fabric formed from warp yarns and/or a weft yarns of the weave
structure, in which yarns the composite filaments and the other filaments are combined
in parallel with each other; (4) a woven or knitted fabric wherein the composite filaments
yarns and the other filaments yarns are used as constituent yarns, and alternately
arranged with every one yarn or every a plurality of yarns (5) a woven or knitted
fabric containing the composite filaments and the other filaments as a core-in-sheath
type composite yarn in which the composite filaments are situated in the core portion
and the other filaments are situated in the sheath portion.
[0078] Moreover, for a woven or knitted fabric containing the composite filaments and other
filaments, when a filament length A of the composite filaments and a filament length
B of the other filaments are in the relationship i A < B upon drying, the air permeability
of the fabric preferably increases upon being wetted with water. Conversely, when
A > B or A = B, the air permeability of the fabric may not increase upon being wetted
with water, for the following reasons: when the percentage of crimp of the composite
filaments decreases and the composite filaments are elongated by being wetted with
water, the other filaments have no allowance for the elongation and cannot be adapted
to the elongation of the composite filaments; as a result, the percentage of openings
in the woven or knitted fabric decreases.
[0079] Herein, the filament length is determined by the following measurement. First, a
woven or knitted fabric is left to stand in an atmosphere at 20°C and 65% RH for 24
hours. Small samples (n = 5) each having dimensions of 30 cm x 30 cm are cut out from
the conditioned woven or knitted fabric. One composite filament yarn and another different
filament yarn are taken out of each sample. A filament length A (mm) of the composite
filaments yarn and a filament length B (mm) of the other different filaments yarn
are determined. During the determination, a load of 1.76 mN/dtex (200 mg/de) is applied
to the sample filament yarn when the yarn is non-elastic, and a load of 0.0088 mN/dtex
(1 mg/de) is applied to the sample filament yarn when the yarn is elastic. Herein,
the composite filaments yarn and the other different filaments yarn must be taken
out of the small sample in the same direction. For example, when the composite filaments
yarn is taken out of the warp yarns (or weft yarns) of the woven or knitted fabric,
the other different filaments yarn must also be taken out of the warp yarns (or weft
yarns). Moreover, when composite yarns are formed from the composite filaments yarn
and the other different filaments yarn, and the woven or knitted fabric is formed
from the composite yarns, the composite yarns are taken out of the cut small sample
(30 cm x 30 cm) (n = 5), and the composite filaments yarn and the other different
filaments yarn are further taken out of the composite yarn. Measurements are similarly
made on the taken-out yarns.
[0080] As explained above, in order to make a difference between a length A of the composite
filaments yarn and a length B of the other different filaments yarn, the following
methods are exemplified: when the woven or knitted fabric is woven or knitted from
the composite filaments yarn and the other different filaments yarn, a method comprising
adjusting the shrinkage of the other different filaments yarn in boiling water to
15% or less (more preferably 10% or less); and a method in which during conjugating
the composite filaments yarn with the other different filaments yarn, the other different
filaments yarn is overfed to the conjugating procedure.
[0081] In order to ensure the movability of composite filaments in the woven or knitted
fabric of the present invention, the basis mass of the fabric is preferably adjusted
to 300 g/m
2 or less (more preferably 100 to 250 g/m
2).
[0082] The woven or knitted fabric of the present invention can be easily produced by, for
example, the following process.
[0083] A modified polyester having an intrinsic viscosity of 0.30 to 0.43 (determined at
35°C with o-chlorophenol used as a solvent), in which 5-sodium sulfoisophthalic acid
is copolymerized in an amount of 2.0 to 4.5 mol%, and a polyamide having an intrinsic
viscosity of 1.0 to 1.4 (determined at 30°C with m-cresol used as a solvent) are melt-spun
together through a spinneret for a side-by-side or eccentric core-sheath composite
filaments. It is particularly important that the intrinsic viscosity of he polyester
resin component be 0.43 or less. When the intrinsic viscosity of the polyester resin
component is higher than 0.43, the viscosity of the polyester component increases,
and thus the physical properties of the resultant composite filaments become close
to those of the yarns formed from only the polyester yarns, and thus the desired woven
or knitted fabric in the present invention cannot be obtained unpreferably. Conversely,
when the intrinsic viscosity of the polyester resin component is less than 0.30, the
melt viscosity of the resin becomes too low and thus the spinnability of the resin
decreases and fluff formation takes place often. As a result, the quality and the
productivity might decrease.
[0084] A spinneret as disclosed in, for example, Fig. 1 in
Japanese Unexamined Patent Publication (Kokai) No. 2000-144518, wherein the extrusion holes of the high viscosity side are separated from those
of the low viscosity side, and the extrusion linear speed of the high viscosity side
is lowered (cross-sectional area of the extrusion holes being increased). Moreover,
a molten polyester is preferably passed through the high viscosity side extrusion
holes, and a molten polyamide is preferably passed through the low viscosity side
extrusion holes and extruded melt flows are cooled and solidified. The weight ratio
of the polyester component to the polyamide component is, as explained above, preferably
from 30:70 to 70:30 (more preferably from 40:60 to 60:40).
[0085] Furthermore, a separate drawing system wherein melt composite spinning is conducted,
the spun yarn is wound once, and the wound yarn is drawn, may be adopted. A direct
drawing system wherein the spun yarn is drawn and heat treated without winding may
also be adopted. A conventional spinning and drawing conditions may be adopted for
the process. For example, when a direct drawing system is conducted, a yarn is spun
at a speed of about 1,000 to 3,500 m/min, and the spun yarn is successively drawn
and wound at temperatures of 100 to 150°C. The draw ratio is suitably selected so
that the composite filaments finally obtained exhibit an elongation at break of 10
to 60% (preferably 20 to 45%) and a tensile strength at break of about 3.0 to 4.7
cN/dtex.
[0086] Herein, the composite filaments preferably satisfy the requirements (1) and (2),
simultaneously.
- (1) The percentage of crimp DC of the composite filaments upon drying is from 1.5
to 13% (preferably from 2 to 6%).
- (2) A difference (DC - HC) between the percentage of crimp DC upon drying and the
percentage of crimp HC upon wetting with water of composite filaments is 0.5% or more
(preferably 1 to 5%).
[0087] The term "upon drying" designates the state of a sample having been allowed to stand
in an environment at a temperature of 20°C at a humidity of 65% RH for 24 hours. On
the other hand, the term "upon being wetted with water" designates the state of a
sample that is immediately after immersing the sample in water at 30°C for 2 hours.
Numerical values obtained by the methods explained below will be used as the percentage
of crimp DC upon drying and the percentage of crimp HC upon being wetted with water,
respectively.
[0088] First, using a rewinding frame having a frame peripheral length of 1.125 m, a composite
yarn is wound at a constant speed under a load of 49/50 mN x 9 x total tex (0.1 gf
x total denier) applied to the yarn to form a small hank having a number of winding
of 10 times. The small hank is twisted to form a double ring, and the twisted hank
is treated in boiling water for 30 minutes under an initial load of 49/2,500 mN x
20 x 9 x total tex (2 mg x 20 x total denier) applied to the hank. After the boiling
water treatment, the treated hank is dried in a drier at 100°C for 30 minutes, and
then further treated with a dry heat at 160°C for 5 minutes while the initial load
is kept applied. After dry heat treatment, the initial load is removed, and the hank
is allowed to stand in an environment at 20°C and 65% RH for 24 hours. The initial
load and a heavy load of 98/50 mN x 20 x 9 x total tex (0.2 gf x 20 x total denier)
are then applied to the hank, and the hank length L0 is determined. The heavy load
alone is immediately removed, and the hank length L1 is determined at a stage of 1
minute after the load removal. Moreover, the hank is immersed in warm water at 20°C
for 2 hours while the initial load is kept applied. The hank is then taken out, and
a pressure of 0.69 mN/cm
2 (70 mgf/cm
2) is applied to the hank with a filter paper sheet so that water is lightly wiped
out. The initial load and the heavy load are then applied, and the hank length L0'
is determined. The heavy load alone is then immediately removed, and the hank length
L1' is determined at a stage of 1 minute after removal of the load. The percentage
of crimp DC (%) upon drying, the percentage of crimp HC (%) upon being wetted with
water and the difference (DC - HC) (%) between the percentage of crimp upon drying
and that upon being wetted with water are calculated from the above determined numerical
values using the following calculation expression:
[0089] The percentage of crimp HC of the composite filaments during wetting with water is
preferably in the range of from 0.5 to 10.0% (more preferably from 1 to 3%).
[0090] When the percentage of crimp DC of the composite filaments upon drying is less than
1.5%, a change in percentage of crimp upon being wetted with water decreases, and
thus, a change in the air permeability of the woven or knitted fabric may decrease.
Conversely, when the percentage of crimp DC of the woven or knitted fabric upon drying
is greater than 13%, the crimp is hardly changed upon being wetted with water because
the crimping is too strong, and thus an extent of change in the air permeability of
the woven or knitted fabric may also decrease. Moreover, when a difference (DC - HC)
between the percentage of crimp DC upon drying and the percentage of crimp HC upon
being wetted with water of the woven or knitted fabric is less than 0.5%, an extent
of a change in the air permeability of the woven or knitted fabric may also decrease.
[0091] Next, the woven or knitted fabric is prepared from the composite filaments alone
or from the composite filaments and other filaments in combination, and the crimp
of the composite filaments is manifested by heat treatment, for example, such a dyeing
treatment.
[0092] Herein, it is important, as explained above, that in the production of a woven or
knitted fabric, the composite filaments be woven or knitted in an amount of 10 wt.%
or more (more preferably 40 wt.% or more), on the basis of the weight of the woven
or knitted fabric. Moreover, there is no specific restriction to the woven or knitted
structure, and it may be appropriately selected from the afore-mentioned structures.
[0093] The dyeing temperature is preferably from 100 to 140°C (more preferably from 110
to 135°C). The holding time at the highest temperature during dyeing procedure is
preferably from 5 to 40 minutes. When the woven or knitted fabric is dyed under the
above-mentioned conditions, a difference in thermal shrinkage between the polyester
component and the polyamide component in the composite filaments manifests the crimps
thereof. Selection of the above-mentioned polymers as the polyester component and
the polyamide component enables the resultant composite filaments take a crimped structure
during the manifestation of the crimp in which the polyamide component is located
inside portions of the crimps.
[0094] After the dyeing is completed, the dyed woven or knitted fabric is usually subjected
to a dry-heat final-set procedure. The dry-heat final-set temperature is preferably
from 120 to 200°C (more preferably from 140 to 180°C), and the first heat-set time
is preferably from 1 to 3 minutes. When the dry-heat final-set temperature is lower
than 120°C, wrinkles generated during dyeing might remain. Moreover, the dimensional
stability of finished articles may be insufficient. Conversely, when the dry heat
final set temperature is higher than 200°C, the crimp of the composite filaments manifested
during dyeing may be decreased, and the filaments may be hardened so as to cause the
hand of the fabric to be stiff.
[0095] The woven or knitted fabric of the present invention may be subjected to various
treatments, for example, conventional raising, UV-ray shielding or imparting functions
with agents such as antibacterial agents, deodorants, moth-proofing agents, luminous
agents, retroreflective agents, negative-ion-generating agents and water absorption
agents.
[0096] The woven or knitted fabric of the present invention can be used for forming at least
a part of the clothes, for example outerwear, sportswear and underwear by utilizing
the characteristic that the percentage of crimp significantly decreases upon wetting
with water the crimped composite filaments contained therein and consequently increasing
the air permeability thereof.
[0097] The clothes of the present invention contain the woven or knitted fabric of the invention
containing crimped composite filaments and having an air permeability that increases
upon being wetted with water, and are characterized in that the dimensions of the
clothes are reversibly enlarged upon being wetted with water to increase the air permeability
and exhibit a ventilation effect.
[0098] The clothes of the present invention include outerwear, sportswear and underwear.
[0099] In a preferred embodiment of the clothes of the present invention, the clothes have
a portion having no dimensional change when wetted with water, and a portion that
reversibly increases the dimensions (reversibly increases the area) upon being wetted
with water. In this embodiment, because the enlargement of the area caused upon being
wetted with water is partially effected, neither the dimensions of the clothes as
a whole nor the gap between the clothes and the skin of the wearer is excessively
enlarged. That is, when a wearer puts the clothes of the above embodiment on and sweats,
a portion having dimensions (area) increased upon being wetted with sweat bulges outside
so that an air gap between the skin of the wearer and the portion increases to increase
the air permeability of the wetted portion and the ventilation effect.
[0100] For the clothes of the present invention, a portion having no dimensional change
upon being wetted with water designates a portion that has a change in area caused
by water wetting of less than 5%, and a portion having a dimensional change when wetted
with water designates a portion having a change in area caused upon being wetted with
water of 5% or more. A change in area of a clothes portion is determined by the following
method.
[0101] A woven or knitted fabric is allowed to stand in an environment at 20°C and 65% RH
(hereinafter referred to as during drying) for 24 hours, and a sample (square sample,
20 cm (warp) x 20 cm (weft)) is cut out in the same direction as the woven or knitted
fabric. The area (cm
2) of the sample is defined as an area upon drying. On the other hand, the sample is
immersed in water at 30°C for 5 minutes (hereinafter referred to as upon being wetted
with water), pulled up, and then held between 2 filter paper sheets within 60 sec
after pulling up. A pressure of 490 N/m
2 (50 kgf/m
2) is applied for 1 minute to remove a water component present among filaments. The
area (cm
2) of the wetted sample is then determined. When the area is reduced by water wetting
the sample, the case is also included in the case in which "the sample has no dimensional
change upon being wetted with water."
[0102] There is no specific restriction to the type of the embodiments of the clothes in
the present invention. Examples of the woven or knitted fabric forming a portion that
has no dimensional change upon being wetted with water include organic natural fibers,
for example, cotton, wool and hemp fibers, organic synthetic fibers, for example,
polyester fibers, nylon fibers and polyolefin fibers, organic semi-synthetic fibers,
for example, cellulose acetate fibers and organic regenerated fibers, for example,
viscose rayon fibers.
[0103] Among the fibers, polyester fibers are appropriate in view of the fiber strength
and handleability. The polyester fibers are produced from a dicarboxylic acid component
and a diglycol component. It is preferred to mainly use terephthalic acid as the dicarboxylic
acid component. It is preferred to mainly use, as the diglycol component, at least
one alkylene glycol selected from ethylene glycol, trimethylene glycol and tetramethylene
glycol. Moreover, the polyester may be made to contain a third component in addition
to the dicarboxylic acid component and the glycol component. Examples of the third
component include a cationic dye-dyeable anionic component, for example, sodiosulfoisophthalic
acid, a dicarboxylic acid other than terephthalic acid, for example, isophthalic acid,
naphthalenedicarboxylic acid, adipic acid, and sebacic acid, and a glycol compound
other than an alkylene glycol such as diethylene glycol, poly(ethylene glycol), bisphenol
A and bisphenolsulfone. At least one of these compounds may be used.
[0104] Filaments having no dimensional change upon being wetted with water may optionally
contain at least one of the following agents or materials: delustering agents (titanium
dioxide), micropore-forming agents (metal salt of organic sulfonic acid), anti-coloring
agents, thermal stabilizers, flame retardants (diantimony trioxide), fluorescent brighteners,
coloring pigments, antistatic agents (metal salt of a sulfonic acid), a hygroscopic
agents (poly(oxyalkylene glycol)), antibacterial agents and other inorganic particles.
[0105] There is no specific restriction to the shape of filaments having no dimensional
change upon being wetted with water. It may be either filaments (multifilaments) or
a staple fiber. In view of obtaining a high flexibility, multifilaments are preferred.
Moreover, the filaments may be ones false twisted and crimped, twisted or air interlaced.
There is no specific limitation to the thickness of the filaments. However, in view
of obtaining a high flexibility, the filaments preferably have an individual filament
thickness of 0.1 to 3 dtex, a number of filaments of 20 to 150 and a total thickness
of 30 to 300 dtex. There is no specific restriction to the cross-sectional profile
of the individual filament and the filament may have a triangular, flat, cross, hexagonal
or hollow cross-sectional shape, in addition to a regular circular cross-sectional
shape.
[0106] There is no specific restriction to the structure of the woven or knitted fabric
that has no dimensional change even when wetted with water, and conventional ones
may be used. Examples of the weave structure of the woven fabric include three foundation
weaves, namely plain weave, twill weave and satin weave, derivative weaves, for example,
derivative twill weave, one side double structures, for example, warp double weave
and weft double weave, and warp velvet weave. The type of the knitted fabric may be
a weft knitted fabric or a warp knitted fabric. Preferred examples of the weft knitted
stitch include a plain stitch, a rubber stitch, a double face stitch, a purl stitch,
a tuck stitch, a float stitch, a half cardigan rib stitch, a lace stitch and a plating
stitch. Examples of the warp knitting stitch include a single dembigh stitch, a single
atlas stitch, a double cord stitch, a half tricot stitch, a fleecy stitch and a jacquard
stitch.
[0107] In the above embodiments of the clothes of the present invention, portions, the dimensions
of which are reversibly enlarged upon wetting with water, are locally arranged, and
the other portions are formed from a woven or knitted fabric the dimensions of which
are not changed even upon wetting with water. Sites where the wearer sweats relatively
much are appropriate as the portions the dimensions of which are reversibly enlarged
upon wetting with water. Examples of the appropriate portions are as follows: woven
or knitted fabric portions 6 arranged in a front 5 schematically shown in Fig. 5;
a woven or knitted fabric portion 8 located in a breast 7 schematically shown in Fig.
6; and a woven or knitted fabric portion 11 arranged in at least one portion of the'
side 9, the back (not shown) and the portions 10 below the sleeves schematically shown
in Fig. 7. Preferred areas of woven or knitted fabric portions the dimensions of which
are reversibly enlarged upon wetting with water are 1 cm
2 or more per woven or knitted fabric portion of the clothes and 500 to 10000 cm
2 in total. It is appropriate that the ratio of a total area of the woven or knitted
fabric portions to a total area of the clothes be from 5 to 70%. When the area ratio
is smaller than 5%, the space volume between the clothes and the skin upon wetting
with water is not sufficiently large, and thus a sufficient ventilation effect cannot
be obtained sometimes. Conversely, when the area ratio is larger than 70%, the dimensions
of the clothes as a whole may be changed upon being wetted with water.
[0108] The woven or knitted fabric of the present invention is used as a fabric for forming
a portion of the clothes the dimensions of which are reversibly enlarged upon being
wetted with water.
[0109] There are no specific restrictions to the woven or knitted fabric structure and a
number of plies of the woven or knitted fabric the dimensions of which are reversibly
enlarged by wetting with water, for the clothes. The following are appropriately exemplified
as the woven or knitted fabric: woven structures, for example, plain weave, twill
weave and satin, and knitting stitch, for example, plain knitting stitch, an interlock
stitch, a circular rib fabric, a tuck float fabric, a plating stitch, a dembigh stitch
and a half tricot stitch. A tubular knitted or a mesh-like woven or knitted fabric
is particularly preferred.
[0110] For a change in dimensions of the above-mentioned portions, the change in the area
is preferably 10% or more, more preferably from 15 to 30%. When the change in the
area is less than 10%, a space volume between the clothes and the skin upon wetting
with water does not increase so much, and the ventilation effect may be insufficient.
The woven or knitted fabric for forming the portions having a dimensional change upon
wetting with water can be easily obtained by, for example, the production process
explained above.
[0111] The woven or knitted fabric for clothes of the present invention is preferably subjected
to a water absorbent treatment. The water absorbent treatment enables the treated
woven or knitted fabric to exhibit an increased air permeability even upon wetting
with a small amount of sweat. There is no specific limitation to the type of the water
absorbent treatment. The following procedure is exemplified as a preferred water absorbent
treatment: a water absorbent treatment agent, for example, a poly(ethylene glycol
diacrylate) or its derivative, or a poly(ethylene terephthalate)-poly(ethylene glycol)
copolymer is applied to the woven or knitted fabric, in an amount of 0.25 to 0.50
wt.% based on the weight of the woven or knitted fabric. Examples of the water absorbent
treatment method include a bath treatment method in which a water absorbent treatment
agent is added to a dyeing solution during dyeing, and a coating method in which,
for example, a woven or knitted fabric is dipped prior to dry heat final set in a
water absorbent treatment solution, and squeezed with a mangle, a gravure coating
method and a screen printing method.
[0112] The clothes of the present invention are prepared from the above woven or knitted
fabric having no dimensional change upon wetting with water and the above-mentioned
woven or knitted fabric the dimensions of which are reversibly enlarged upon wetting
with water, by a conventional process. The woven or knitted fabrics of the present
invention may be subjected to various treatments, for example, dyeing, water absorbent
treatment, conventional raising, UV-ray shielding treatment or function-imparting
treatment with, for example, antibacterial agents, deodorants, moth-proofing agents,
luminous agents, retroreflective agents, negative-ion generating agents and water
repellants.
[0113] When a wearer puts the clothes of present invention on, and sweats, portions of the
clothes the dimensions of which are reversibly enlarged upon wetting with water are
enlarged, and the portions flutter during wearer's movement to produce a ventilation
effect (bellows effect) to cause the wearer to be released from a stuffy feeling and
the stickiness created by the sweating. Excellent wearable comfortability can thus
be obtained. The performance of the clothes of the present invention will be further
explained in Example 4 and Comparative Example 3 to be explained later by making reference
to Fig. 8.
[0114] The clothes of the present invention can be appropriately used as outerwear, sportswear,
underwear, etc. In addition, accessories such as buttons may be safely attached to
the clothes of the invention.
Examples
[0115] The woven or knitted fabric and clothes of the present invention will be further
explained by with reference to the following examples.
[0116] In examples and comparative examples, the following tests were conducted.
<Intrinsic Viscosity of Polyester>
[0117] o-Chlorophenol was used as a solvent, and measurements were made at 35°C.
<Intrinsic Viscosity of Polyamide>
[0118] m-Cresol was used as a solvent, and measurements were carried out at a temperature
of 30°C.
<Tensile strength and elongation at break>
[0119] A filament sample was left to stand in a thermohygrostat chamber at an atmospheric
temperature of 25°C at a humidity of 60% RH for one day and night. The sample was
then set in a Tensilon (trademark) tensile tester (manufactured by Shimadzu Corporation)
with a sample length of 100 mm, and stretched at a rate of 200 mm/min, and the tensile
strength (cN/dtex) and the elongation (%) at break were determined. In addition, n
was 5 and the average values were obtained.
<Shrinkage in boiling water>
[0120] The shrinkage in boiling water (hot water shrinkage) (%) was determined by the method
specified in JIS L 1013-1998 17-15. In addition, n was 3, and the average value was
obtained.
<Percentage of crimp of composite filaments>
[0121] Using a rewinding frame having a frame peripheral length of 1.125 m, a composite
yarn was rewound at a constant speed while a load of 49/50 mN x 9 x total tex (0.1
gf x total denier) was applied to the yarn, to form a small hank having wound 10 times.
The small hank was twisted to form a double ring, and the twisted hank was treated
in boiling water for 30 minutes while an initial load of 49/2,500 mN x 20 x 9 x total
tex (2 mg x 20 x total denier) was applied. The hank treated in boiling water was
dried with a drier at a temperature of 100°C for 30 minutes, and then further treated
with a dry heat at 160°C for 5 minutes while the initial load was applied thereto.
After dry heat treatment was completed, the initial load was removed, and the hank
was left to stand in an environment at 20°C and 65% RH for 24 hours. The initial load
and a heavy load of 98/50 mN x 20 x 9 x total tex (0.2 gf x 20 x total denier) were
then applied to the hank, and the length L0 of the hank was measured. The heavy load
alone was immediately removed, and 1 minute after the load removal, the length L1
of the hank was measured. Moreover, the hank was immersed in warm water at a temperature
of 30°C for 2 hours while the initial load was applied thereto. The hank was then
taken out, and within 60 sec after taking out the hank, the hank was lightly wiped
with a filter paper sheet, while applying a pressure of 0.69 mN/cm
2 (70 mgf/cm
2) to the hank with a filter paper sheet, 30 cm x 30 cm. The initial load and the heavy
load were then applied, and the length L0' of the hank was measured. The heavy load
alone was then immediately removed, and 1 minute after removal of the load the length
L1' of the hank was measured. The percentage of crimp DC (%) of the filament sample
upon drying, the percentage of crimp HC (%) of the sample upon wetting with water
and the difference (DC - HC) (%) between the percentage of crimp upon drying and that
upon wetting with water were calculated from the data of the above mentioned measurements
in accordance with the following equations.
[0122] In addition, n is 5, and the average values are obtained.
<Percentage of Crimp of Composite Filaments in Woven or Knitted Fabric>
[0123] A woven or knitted fabric was left to stand in an air atmosphere at a temperature
of 20°C at a humidity of 65% RH for 24 hours. Small samples each having dimensions
of 30 cm x 30 cm were taken (n = 5) from the woven or knitted fabric in the same direction
thereof. A composite filament was taken out from each small sample. A load of 1.76
mN/dtex (200 mg de) was applied to the composite filament, and the length L2 of the
filament was measured. One minute after removal of the load, a load of 0.0176 mN/dtex
(2 mg/de) was applied to the filament, and the length L3 of the filament was measured.
Moreover, the filament was immersed in water at a temperature of 30°C for 2 hours,
and then taken out. Within 60 sec after taking out, the sample was held between filter
paper sheets, each in dimensions of 30 cm x 30 cm, and a pressure of 0.69 mN/cm
2 (70 mgf/cm
2) was applied thereto for 5 sec to lightly wipe out water. A load of 1.76 mN/dtex
(200 mg de) was applied to the sample, and the length L2' of the filament was measured.
One minute after removal of the load, a load of 0.0176 mN/dtex (2 mg/de) was applied
to the sample, and the length L3' of the filament was measured. The percentage of
crimp DC
F (%) upon drying, the percentage of crimp HC
F (%) upon being wetted with water and the difference (DC
F - HC
F) (%) between the percentage of crimp upon drying and that upon being wetted with
water were calculated from the data measured as mentioned above in accordance with
the following equations. In addition, n was 5, and the average values were obtained.
<Air permeability>
[0124] The air permeability (ml/cm
2/sec) of a fabric sample upon drying and the air permeability (ml/cm
2/sec) upon being wetted with water were measured in accordance with JIS L 1096-1998
6.27.1, Method A (Fragile-type testing machine method). The term "upon drying" designated
the state of a sample left to stand in an environment at a temperature of 20°C at
a humidity of 65% RH for 24 hours. On the other hand, the term "upon being wetted
with water" designated the state of a sample that was subjected to the following procedures:
the sample was immersed in water at a temperature of 30°C for 2 hours, pulled up from
the water, and within 60 sec after pulling up the sample, held between a pair of filter
paper sheets each having dimensions of 50 cm x 50 cm, while a pressure of 490 N/m
2 (50 kgf/m
2) was being applied to the sample for 1 minute to remove the water present among the
filaments. The air permeability is then determined (n = 5), and the average values
are obtained. The change in air permeability is calculated from the following equation:
<Stretch percentage of Woven or Knitted Fabric>
[0125] The stretch elongation (%) in the warp direction and that in the weft direction of
a woven or knitted fabric were determined by the same method as JIS L
-1096 8.14.1, Method B (Constant Load Method) except that the load was changed to 1/10
(1.47N = 0.15 kgf).
[0126] The average of the measured data (n = 5) was calculated.
<Measurement of length of yarn>
[0127] First, a woven or knitted fabric is left to stand in an air atmosphere at 20°C and
65% RH for 24 hours. Small samples (n = 5) each having dimensions of 30 cm x 30 cm
are taken from the woven or knitted fabric. One composite filaments yarn and another
filaments yarn were taken out from each sample. A yarn length A (mm) of the composite
filaments yarn and a yarn length B (mm) of the different filaments yarn were measured.
In the measurement, a load of 1.76 mN/dtex (200 mg/de) was applied to a sample yarn
when the yarn is a non-elastic yarn, and a load of 0.0088 mN/dtex (1 mg/de) was applied
to a sample yarn when the yarn is an elastic one. In addition, n was 5, and the average
was calculated.
<Water Repellency>
[0128] The water repellency of the woven or knitted fabric was determined in accordance
with JIS L 1092, 6.2 Spray Test.
<Change in dimensions>
[0129] A woven or knitted fabric is allowed to stand in an environment at a temperature
of 20°C at a humidity of 65% RH for 24 hours, and square samples (20 cm (warp) x 20
cm (weft) were taken in the same direction as the woven or knitted fabric. The area
(cm
2) of each sample is defined as an area (cm
2) upon drying. The sample was immersed in water at a temperature of 20°C for 5 minutes
(hereinafter referred to as upon being wetted with water), then held between a pair
of filter paper sheets while applying a pressure of 490 N/m
2 (50 kgf/m
2) to the sample for 1 minute to remove water present among filaments. The area of
the sample was determined and defined as an area of the sample (cm
2) upon being wetted with water. A change (%) in dimensions was calculated from the
following equation defining the change in area of the sample.
Example 1
[0130] A nylon 6 having an intrinsic viscosity [η] of 1.3 was melted at 270°C, and a modified
poly(ethylene terephthalate) in which 2.6 mol% of 5-sodium sulfoisophthalic acid was
copolymerized and that had an intrinsic viscosity [η] of 0.39 was melted at 290°C.
Both molten polymers were extruded through a spinneret for side-by-side type composite
filaments in an extrusion rate of 12.7 g/min for each polymer. The spinneret was one
described in
Japanese Unexamined Patent Publication (Kokai) No. 2000-144518. The spinning nozzle was formed from two arc-shaped slits A and B arranged substantially
on one the same circumference at a spacing d. The area SA of the arc-shaped slit A,
the slit width A1, the area SB of the arc-shaped slit B, the slit width B1 and the
area SC surrounded by the inner peripheral faces of the arc-shaped slits A and B simultaneously
satisfy the following requirements (1) to (4):
The poly(ethylene terephthalate) was extruded through the slit A side, and the nylon
6 was extruded through the slit B side to form a side-by-side type undrawn composite
filaments yarn having a cross-sectional profile as shown in Fig. 1. The undrawn filament
yarn was cooled to be solidified, and a spinning oil was imparted thereto. The filament
yarn was drawn and heat treated at a speed of 1,000 m/min, by preheating with a preheating
roller at a temperature of 60°C, and drawing and heat treating between the preheating
roller and a heating roller having a speed of 3,050 m/min and heated at 150°C at a
draw ratio of 3.05. The resultant yarn was wound up. A composite filaments yarn of
84 dtex/24 fil was obtained.
[0131] The drawn composite filaments yarn thus obtained had a tensile strength at break
of 3.4 cN/dtex and an elongation at break of 40%. Moreover, when the composite filaments
yarn was subjected to a treatment in boiling water to cause the filaments to crimp,
the filaments yarn had a percentage of crimp DC upon drying of 3.3% and a percentage
of crimp HC upon being wetted with water of 1.6%. Thus the difference (DC - HC) between
the percentage of crimp DC upon drying and the percentage of crimp HC upon wetting
with water was 1.7%.
[0132] Using a 28-gauge double tubular knitting machine, a tubular knitted fabric having
an interlock stitch with a knitting density of 42 courses/2.54 cm and 35 wales/2.54
cm was prepared from non-twisted composite filaments yarns (no treatment with boiling
water was applied and no crimp was manifested on the filaments) alone.
[0133] The tubular knitted fabric was dyed at a temperature of 130°C for a peak temperature-keeping
time of 15 minutes to manifest the latent crimpability of the composite filaments
yarn. During dyeing, a water-absorbent agent (poly(ethylene terephthalate)-poly(ethylene
glycol) copolymer) was added to the dyeing bath in an amount of 2 ml per liter of
the dyeing solution. The water-absorbent agent was imparted to the knitted fabric
by the bath treatment during dyeing. Then the tubular knitted fabric was dry heat
final set at 160°C for one minute.
[0134] The knitted fabric thus obtained had a basis weight of 214 g/m
2, and had a stretch percentage of 70% in the warp direction, and a stretch percentage
of 110% in the weft direction, an air permeability upon drying of 90 ml/cm
2/sec, an air permeability upon being wetted with water of 370 ml/cm
2/sec and a change in air permeability of 311%. The significant improvement of the
air permeability upon wetting with water was confirmed with satisfactory. Moreover,
composite filaments taken from the knitted fabric had a percentage of crimp DC
F upon drying of 68% and a percentage of crimp HC
F upon being wetted with water of 22%. That is, the difference (DC
F - HC
F) between the percentage of crimp upon drying and the one upon wetting with water
was 46%.
Example 2
[0135] The same composite filaments yarn as used in Example 1 and a conventional poly(ethylene
terephthalate) multifilaments yarn (84 dtex/30 f) were used. Using 28-gauge double
tubular knitting machine in the same manner as in Example 1, the composite filaments
yarns and the poly(ethylene terephthalate) multifilaments yarns were alternately fed
to the machine with every one yarn to form a tubular knitted fabric having an interlock
stitch with a knitting density of 54 courses/2.54 cm and 34 wales/2.54 cm. The tubular
knitted fabric was subjected to dyeing, water absorbent treatment and dry heat final
set in the same manner as in Example 1.
[0136] The knitted fabric thus obtained had a basis weight of 206 g/m
2, and exhibited a stretch percentage of 50% in the warp direction, a stretch percentage
of 100% in the weft direction, an air permeability upon drying of 150 ml/cm
2/sec, an air permeability upon being wetted with water of 280 ml/cm
2/sec and a change in air permeability of 87%. The knitted fabric was satisfactory
because the air permeability upon being wetted with water was greatly improved. Moreover,
a composite filaments taken from the knitted fabric had a percentage of crimp DC
F upon drying of 63% and a percentage of crimp HC
F upon wetting with water of 20%. That is, the difference (DC
F - HC
F) between the percentage of crimp upon drying and that upon being wetted with water
was 43%.
Comparative Example 1
[0137] A nylon 6 having an intrinsic viscosity [η] of 1.3 and a modified poly(ethylene terephthalate)
in which 2.6 mol% of 5-sodium sulfoisophthalic acid was copolymerized and that had
an intrinsic viscosity of 0.48 were melted at 270°C and 290°C, respectively, extruded
through a spinneret for forming a side-by-side type composite filaments (explained
in Example 1) in an extrusion rate of 12.7 g/min for each polymer to form a side-by-side
type composite filaments having a cross-sectional profile as shown in Fig. 1. The
extruded filaments were cooled to solidify them, and a spinning oil was imparted thereto.
The undrawn filament yarn thus obtained was drawn and heat-treated at a speed of 1,000
m/min, by preheating by a preheating roller at a temperature of 60°C, and drawing
and heat treating between the preheating roller and a heating roller at a speed of
2,700 m/min at a temperature of 150°C. The resultant filament yarn was wound. A composite
filament yarn of 84 dtex/24 fil. was obtained. The drawn composite filaments yarn
thus obtained had a tensile strength at break of 2.3 cN/dtex and an elongation at
break of 41%. The composite filaments yarn was subjected to a treatment in boiling
water and the percentage of crimp of the resultant filaments was measured. The percentage
of crimp DC upon drying was 1.2% and a percentage of crimp HC upon being wetted with
water was 3.9%. Thus the difference (DC - HC) between the percentage of crimp DC upon
drying and the percentage of crimp HC upon being wetted with water was -2.7%.
[0138] From the composite filaments yarns, a tubular knitted fabric was prepared in the
same manner as in Example 1. The resultant tubular knitted fabric was subjected to
dyeing, water absorbent treatment and dry final set in the same manner as in Example
1.
[0139] The knitted fabric thus obtained had a basis weight of 170 g/m
2, and exhibited a stretch percentage of 52% in the warp direction, a stretch percentage
of 102% in the weft direction, an air permeability upon drying of 230 ml/cm
2/sec, an air permeability upon being wetted with water of 160 ml/cm
2/sec and a change in air permeability of -30%. The knitted fabric was unsatisfactory
because the air permeability upon being wetted with water was low. Moreover, a composite
filament taken from the knitted fabric had a percentage of crimp DC
F upon drying of 54% and a percentage of crimp HC
F upon being wetted with water of 65%. That is, the difference (DC
F - HC
F) between the percentage of crimp upon drying and that upon being wetted with water
was -11%.
Example 3
[0140] The same side-by-side type composite filaments yarns as in Example 1 were produced.
The composite filaments yarns were supplied to a conventional 28-gauge tricot knitting
machine. The composite filaments yarns were fed to a back guide bar of the knitting
machine at a full set. On the other hand, a conventional false twisted, crimped poly(ethylene
terephthalate) multifilament yarns (33 dtex/36 fil.) having a percentage of crimp
of 20% were simultaneously fed to a front guide bar of the tubular knitting machine
at a full set to give a knitted fabric having a half tricot stitch (back: 10-12, front:
23-10) with an on-machine density of 80 courses/2.54 cm.
[0141] The knitted fabric was dyed at 130°C for a peak temperature-keeping time of 15 minutes
so that the latent crimpability of the composite filaments was manifested. The knitted
fabric was then subjected to padding treatment with a fluororesin water repellent
treatment liquid. The treated knitted fabric was then dried at a temperature of 100°C,
and dry heat final set at a temperature of 160°C for 1 minute.
[0142] The knitted fabric thus obtained had a basis weight of 220 g/m
2, and had a stretch percentage of 13% in the warp direction, a stretch percentage
of 30% in the weft direction, a water repellency of 5 points, an air permeability
upon drying of 45 ml/cm
2/sec, an air permeability upon being wetted with water of 64 ml/cm
2/sec and a change in air permeability of 42%. The knitted fabric was satisfactory
because the air permeability upon wetting with water was greatly enhanced. Moreover,
composite filaments taken from the knitted fabric exhibited a percentage of crimp
DC
F upon drying of 64% and a percentage of crimp HC
F upon being wetted with water of 32%. That is, the difference (DC
F - HC
F) between the percentage of crimp upon drying and that upon being wetted with water
was 32%.
Comparative Example 2
[0143] A side-by-side type composite filaments yarns were produced from a nylon 6 and a
5-sodium sulfoisophthalic acid-copolymerized poly(ethylene terephthalate) resin in
the same manner as in Comparative Example 1.
[0144] Using the composite filaments yarns, a knitted fabric was prepared in the same manner
as in Example 3. The knitted fabric was subjected to dyeing, water repellency treatment
and dry final set.
[0145] The knitted fabric thus obtained had a basis weight of 210 g/m
2, and exhibited a stretch percentage of 12% in the warp direction, a stretch percentage
of 22% in the weft direction, a water repellency of 5 points, an air permeability
upon drying of 54 ml/cm
2/sec, an air permeability upon being wetted with water of 41 ml/cm
2/sec and a change in air permeability of -24%. The knitted fabric was unsatisfactory
because the air permeability upon being wetted with water was low. Moreover, composite
filaments taken from the knitted fabric exhibited a percentage of crimp DC
F upon drying of 56% and a percentage of crimp HC
F upon being wetted with water of 62%. That is, the difference (DC
F - HC
F) between the percentage of crimp upon drying and that upon being wetted with water
was -6% which was unsatisfactory
Example 4
[0146] A nylon 6 having an intrinsic viscosity [η] of 1.3 and a modified poly(ethylene terephthalate)
in which 2.6 mol% of 5-sodium sulfoisophthalic acid was copolymerized and that had
an intrinsic viscosity of 0.39 were melted at 270°C and 290°C, respectively, extruded
through the same composite spinning spinneret as in Example 1, at an extrusion rate
of 12.7 g/min for each polymer, to form a side-by-side type composite filaments yarn.
The extruded yarn was cooled to be solidified, and a spinning oil was imparted thereto.
The yarn was then drawn and heat-treated at a speed of 1,000 m/min, by preheating
by a preheating roller at a temperature of 60°C, and drawn and heat treated between
the preheating roller and a heating roller having a speed of 3,050 m/min a temperature
of at 150°C. The resultant yarn was wound. A composite filament yarn of 84 dtex/24
fil was obtained. The drawn composite filament yarn thus obtained had a tensile strength
of 3.4 cN/dtex and an elongation at break of 40%. When the composite filaments yarn
was subjected to a treatment in boiling water and the percentage of crimp was measured,
it was found that the percentage of crimp DC upon drying was 3.3% and the percentage
of crimp HC upon being wetted with water was 1.6%. The difference (DC - HC) between
the percentage of crimp upon drying DC and the percentage of crimp upon being wetted
with water HC was therefore 1.7%.
[0147] The composite filaments yarn (that was not subjected to treatment in boiling water,
and that had no crimps, and non-twisted) alone was used, to produce a tubular knitted
fabric having a plain knitting stitch and a density of 65 courses/2.54 cm and 37 wales/2.54
cm, by using a 28-gauge double tubular knitting machine.
[0148] The tubular knitted fabric was dyed at 130°C for a peak temperature-keeping time
of 15 minutes to manifest the latent crimpability of the composite filaments yarn.
The tubular knitted fabric was then subjected to dry heat final set at a temperature
of 160°C for 1 minute.
[0149] The knitted fabric thus obtained (knitted fabric having dimensions that were reversibly
increased upon wetting with water) had a basis weight of 120 g/m
2, a knitting density of 71 courses/2.54 cm and 61 wales/2.54 cm, and exhibited a dimensional
change of 21% (7% in the warp direction and 13% in the weft direction).
[0150] Separately, using a 28-gauge double knitting machine, a tubular knitted fabric having
an interlock stitch with a gray fabric density of 45 courses/2.54 cm and 41 wales/2.54
cm was prepared from a false twisted and crimped poly(ethylene terephthalate) yarn
(56 dtex/72 fil.). The knitted fabric was similarly dried as above. The knitted fabric
(that had no dimensional change caused by wetting with water) was then cut and sewn
to give a shirt with a half-sleeve length.
[0151] Next, the breast (15 cm long and 20 cm wide) alone of the shirt was cut and removed,
and a cut piece of the composite filaments yarn knitted fabric was sewn and fixed
to the breast of the shirt as shown in Fig. 6.
[0152] A panelist wore the shirt thus obtained, and a wearing test was conducted in a room
adjusted to a temperature of 28°C and a humidity of 50% RH according to the wearing
step mentioned below, and the humidity within the clothes (space between the skin
and the clothes) was determined. The results are shown by a curve A in Fig. 8. During
physical exercise, the panelist hardly felt stuffy due to the ventilation effect of
the piece of the composite filament knitted fabric arranged in the breast of the shirt.
After the physical exercise, the panelist felt significantly less stuffy, and felt
comfortable due to the ventilation effect in combination with the wind. Wearing test:
rest for 5 minutes (with wind at 1.5 m/sec) → running for 15 minutes (10 km/h) → rest
for 10 minutes (without wind) → rest for 20 minutes (with wind at 1.5 m/sec)
Comparative Example 3
[0153] A panelist wore the same shirt prepared from the false twisted and crimped poly(ethylene
terephthalate) yarn (56 dtex/72 f) alone as in Example 1, and the same wearing test
as in Example 4 was conducted. The results are shown by a curve B in Fig. 8. The panelist
who wore the shirt felt significantly stuffy during physical exercise because the
shirt had substantial no ventilation effect. Moreover, the stuffy feeling lasted for
a long time after the physical exercise was finished, and the panelist felt uncomfortable.
Industrial Applicability
[0154] The woven or knitted fabric of the present invention containing crimped composite
filaments and clothes of the present invention containing the woven or knitted fabric
exhibit an air permeability that is increased upon wetting with water to promote drying
of the woven or knitted fabric. Drying of the woven or knitted fabric causes the air
permeability to decrease and to improve the warmth retention. The woven or knitted
fabric is therefore useful for outerwear, sportswear, underwear and other clothes.