TECHNICAL FIELD
[0001] The present invention relates to a conductive composite textured yarn having excellent
conductivity and wearing durability, and a fabric and a garment using the same.
BACKGROUND ART
[0002] Conductive garments have been conventionally used for preventing electrostatic attraction
of dust in a workplace or clean room for handling parts and chemicals to which static
electricity is an obstacle. In the conductive garment, conductive yarns are woven
into the garment for taking measures against static electricity. Specifically, electrostatic
attraction of dust is prevented by weaving conductive yarns into the garment at a
certain interval in a stripe or lattice and neutralizing static electricity using
corona discharge. In general, the conductive yarn is often colored in black or gray,
and thus, from the viewpoint of aesthetics, it has been proposed to expose a large
amount of the conductive yarn on the inner surface of the garment (see Patent Document
1). However, in this method, when the conventional conductive yarn is used as it is,
the surface electric resistance value on the outer side of the garment increases,
thereby deteriorating the efficiency of diffusing the static electricity generated
in the garment to the outer side of the garment.
[0003] In recent years, as required characteristics of electrostatic control, surface resistance
values of conductive garments have been standardized in International Electrotechnical
Commission (IEC) 61340-5-1, 5-2, and surface electrical continuity over the entire
garment is required. In order to enhance the electrical continuity in the entire region
of the garment, not only electrical continuity in the oblique direction of the fabric
but also electrical continuity across the seam is required. In this case, it is necessary
to weave the conductive yarns in a lattice such that the conductive yarns are in contact
between different directions, and to bring the conductive yarns into contact with
each other also at the sewn portion of the fabric.
[0004] In order to meet the requirements of IEC, for example, there is proposed a polyester
fabric in which conductive yarns are regularly arranged as warp and weft yarns at
intervals of 5 mm or more and 30 mm or less (see Patent Document 2). However, in this
fabric, when operations such as bending, pulling, and flexion in long-term continuous
use and washing assuming an actual wearing environment are repeatedly performed, the
conductive yarn is buried in the fabric, and the conductive performance cannot be
maintained.
[0005] In addition, there is proposed a fabric that has excellent surface conductivity by
using a conductive yarn as a floating yarn for double weave (see Patent Document 3).
However, since the conductive yarn in this fabric is in a state of floating on the
surface for a long time, when the fabric is used continuously for a long time, there
are problems that the conductive yarn deteriorates due to washing or friction and
cannot maintain the conductive performance and the structure has large restrictions.
[0006] Furthermore, there is proposed a fabric using a conductive composite textured yarn
obtained by subjecting a conductive yarn to relaxation heat treatment to reduce shrinkage
and then mixing the conductive yarn with a non-conductive yarn (see Patent Document
4). In this method, degradation of conductive performance due to repeated washing
is certainly considered, but the influence of operations such as bending, pulling,
and flexion assuming an actual wearing environment is not considered. In actual long-term
wearing, the conductive yarn deteriorates, and cannot maintain the conductive performance
for a long period of time.
PRIOR ART DOCUMENTS
PATENT DOCUMENTS
SUMMARY OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
[0008] In view of the current state of the prior art, an object of the present invention
is to provide a conductive composite textured yarn excellent in conductivity and wearing
durability, and a fabric and a garment using the same.
SOLUTIONS TO THE PROBLEMS
[0009] The present invention has any of the following configurations for solving the above
problems.
- (1) A conductive composite textured yarn including a conductive yarn a and a non-conductive
yarn b that are combined by entanglement, wherein the conductive yarn a is a non-crimped
yarn, and the non-conductive yarn b is a crimped yarn, the conductive composite textured
yarn satisfying all following characteristics:
crimp rate (%) of conductive composite textured yarn: 10 to 55, and
degree of entanglement (entangled parts/m) of conductive composite textured yarn:
20 to 150.
- (2) The conductive composite textured yarn according to [1], wherein the conductive
composite textured yarn is subjected to twisting, and a number of twists is 100 to
1500 (T/M).
- (3) A fabric in which the conductive composite textured yarn according to [1] or [2]
and a non-conductive textured yarn are arranged in a lattice pattern at intervals,
the fabric satisfying all following characteristics:
crimp rate (%) of non-conductive textured yarn: 10 to 55, and
degree of entanglement (entangled parts/m) of non-conductive textured yarn: 30 to
100.
- (4) The fabric according to [3], wherein a surface resistance value in a method described
in IEC 61340-5-1, 5-2 after 100 times of industrial washing and after 100 times of
repeated stretching in a bias direction is 1010 Q or less.
- (5) A garment including the fabric according to [3] or [4].
EFFECTS OF THE INVENTION
[0010] According to the present invention, since the conductive yarn a and the non-conductive
yarn b are entangled in a state of having a degree of entanglement and a crimp rate
in a specific range, the conductive yarn a exists on the yarn surface even after repeated
wearing and washing, and not only exhibits excellent conductivity immediately after
weaving and sewing, but also can exhibit the conductivity for a long period of time.
That is, according to the present invention, it is possible to obtain a conductive
composite textured yarn having conductivity and wearing durability thereof, and a
fabric and a garment using the same.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Fig. 1 is one example of how two pieces of fabrics are overlapped at the time of
sewing the two pieces of fabrics to measure the surface resistance value.
EMBODIMENTS OF THE INVENTION
[0012] In the conductive composite textured yarn according to the present invention, it
is important to provide a composite textured yarn in which a conductive yarn a and
a non-conductive yarn b are combined by entanglement.
[0013] Here, the conductive yarn a is a non-crimped yarn, and is (i) a metal-coated yarn,
or (ii) a conductive yarn obtained by composite spinning of a polyester-based or polyamide-based
base polymer serving as a fiber substrate and a polymer in which conductive fine particles
of carbon, metal, a metal compound, or the like are dispersed.
[0014] In the present invention, a conductive yarn containing carbon as a conductive component
is preferably used from the viewpoints of durability in an acid or alkaline environment
and washing durability. Examples of the method for combining the conductive component
with the yarn include methods in which the yarn has a core-sheath structure, and the
conductive component is disposed in the sheath portion to form a type in which the
conductive component is exposed on the entire surface or a type in which the conductive
component is exposed on a part of the surface. In addition, the cross-sectional shape,
the exposed portion of the conductive component, and the like can be freely selected
without any problems. However, from the viewpoints of the exposure rate of the conductive
component on the surface in the case of a fabric and the transfer of charges between
single fibers which constitute the conductive yarn, a type in which the conductive
component is exposed on the entire surface is preferable.
[0015] Here, as the base polymer of the conductive yarn a, polyester, specifically polyethylene
terephthalate is preferred from the viewpoints of spinning stability and long-term
continuous use. Examples of the glycol component of the polyester include, but are
not limited to, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol,
cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol. In addition,
the polyester may contain a copolymerization component capable of forming another
ester bond within a range in which the effect of the present invention is not inhibited.
Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic
acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, and sulfonic
acid.
[0016] When carbon is used as the conductive component in the conductive yarn a, the carbon
content is preferably 15 to 40 wt% with respect to the total weight of the constituent
components of the conductive yarn a. Here, when the content of the conductive carbon
is less than 15 wt%, sufficient conductive performance may not be exhibited. On the
other hand, when the content is more than 40 wt%, the fluidity of the polymer is remarkably
lowered, and the yarn-making properties may extremely deteriorate. When carbon is
completely dispersed as particles, the conductivity is generally poor. When a carbon
has a chain structure called a structure, the conductivity is improved and the carbon
is a so-called conductive carbon. Thus, for making a polymer conductive with a conductive
carbon, it is important to disperse the carbon black without destroying the structure.
It is believed that the electric conduction mechanism of a composite of the conductive
carbon and the polymer is based on contact of the carbon chain and the tunnel effect
and is mainly based on the former. Accordingly, as the carbon chain is longer and
the carbon is present in the polymer at higher density, the contact probability becomes
higher, leading to a higher conductivity. Here, the specific resistance of the conductive
yarn a in the present invention is preferably 10
-1 to 10
8 Ω·cm from the viewpoint of achieving both conductivity and cost.
[0017] The total fineness of the conductive yarn a is preferably 11 to 167 dtex from the
viewpoint of imparting the conductive performance to the fabric. Here, when the total
fineness is less than 11 dtex, the conductive performance may be insufficient, which
is not preferable. When the total fineness exceeds 167 dtex, the crimpability of the
non-conductive yarn b is easily inhibited, which is not preferable. The total fineness
of the conductive yarn a is more preferably 22 to 56 dtex.
[0018] The single yarn fineness of each conductive yarn a is preferably 2 to 22 dtex from
the viewpoints of maintaining the conductive performance and mixability with the non-conductive
yarn b. Here, when the single yarn fineness is less than 2 dtex, fuzz is generated
on the yarn which is subjected to repeated washing and abrasion and the conductivity
is easily inhibited, which is not preferable. When the single yarn fineness is more
than 22 dtex, breakage due to flexion tends to occur during wearing, which is not
preferable. The single yarn fineness of the conductive yarn a is more preferably 3
to 10 dtex.
[0019] On the other hand, as the characteristics of the non-conductive yarn b, it is important
that the non-conductive yarn b be a textured yarn having crimps in at least a part
thereof. The non-conductive yarn b may be a polyester fiber or a nylon fiber, but
is preferably a polyester fiber having high crimp durability. Specific examples of
the non-conductive yarn b include, but are not limited to, fibers of aromatic polyesters
such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene
terephthalate, and fibers of aliphatic polyesters such as polylactic acid and polyglycolic
acid. Among these, fibers of polyethylene terephthalate, polypropylene terephthalate,
and polybutylene terephthalate are preferable because they are excellent in mechanical
properties and their crimps are durable. In addition, fibers of polyethylene terephthalate
are preferable because washing durability inherent in polyester fibers can be obtained.
[0020] As polyethylene terephthalate, it is possible to use a polyester which contains
terephthalic acid as the main acid component and ethylene glycol as the main glycol
component and 90 mol% or more of which is composed of ethylene terephthalate repeating
units. In addition, a copolymerization component capable of forming another ester
bond may be contained within a range in which the effect of the present invention
is not inhibited. Examples of the copolymerizable compound include dicarboxylic acids
such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic
acid, and sulfonic acid.
[0021] The non-conductive yarn b can be selected from those having any cross section shape,
for example, a polygonal shape, a diverse shape, or a hollow shape, such as a round
shape, a triangular shape, a flat shape, a hexagonal shape, an L-shape, a T-shape,
a W-shape, an octafoil shape, or a dog-bone shape.
[0022] The crimps to be imparted to the non-conductive yarn b may be imparted by any method
such as a false twisting method, a stuffing box method, a knit de knit method, or
a bimetal structure, but crimps by a false twisting method are preferable because
of the high crimp durability during wearing. When crimps are imparted by using a bimetal
structure, the non-conductive yarn b preferably has a bimetal structure of polyethylene
terephthalate and polypropylene terephthalate or a bimetal structure of polyethylene
terephthalate and polybutylene terephthalate.
[0023] The total fineness of the non-conductive yarn b is preferably 56 to 400 dtex from
the viewpoint of imparting tension and elasticity to the fabric. Here, when the total
fineness is less than 56 dtex, a load is applied to the conductive yarn during repeated
wearing, and the conductive performance may deteriorate, which is not preferable.
When the total fineness exceeds 400 dtex, the texture becomes hard and the wearing
comfort is lowered, which is not preferable.
[0024] The single yarn fineness of each non-conductive yarn b is preferably 0.5 to 10 dtex
from the viewpoint of imparting tension and elasticity to the fabric. Here, when the
single yarn fineness is less than 0.5 dtex, fuzz is generated on the yarn which is
subjected to repeated washing and abrasion and the conductivity is easily inhibited,
which is not preferable. When the single yarn fineness exceeds 10 dtex, the fibers
are too thick and the texture becomes too hard, which is not preferable.
[0025] In the conductive composite textured yarn of the present invention, it is important
to provide a conductive composite textured yarn in which the conductive yarn a and
the non-conductive yarn b is combined by entanglement, and the degree of entanglement
is 20 to 150 (entangled parts/m). By continuously applying entanglement in the longitudinal
direction of the yarn, the conductive yarn a and the non-conductive yarn b are mixed,
and convergence and opening are repeated. Due to this effect, the number of contacts
between the conductive yarns increases in the fabric, and the charge can be efficiently
transferred. Furthermore, even after repeated washing, the conductive yarn is present
on the fabric surface, so that the conductive performance can be maintained. Here,
when the degree of entanglement is less than 20, the number of contacts between the
conductive yarns is reduced, and the conductive yarns are easily buried in the fabric
after washing, whereby the conductive performance deteriorates. On the other hand,
when the degree of entanglement exceeds 150, the number of entanglements is too large,
the conductive yarn tends to become fuzzy, and the conductive performance deteriorates,
which is not preferable. The degree of entanglement is more preferably 30 to 130 (entangled
parts/m).
[0026] Further, it is important that at least a part of the non-conductive yarn b have
crimps. Here, the crimp rate of the non-conductive yarn b is preferably 10 to 60%.
Thus, the conductive composite textured yarn can also have crimps.
[0027] It is important that the crimp rate of the conductive composite textured yarn be
10 to 55%. By imparting such a crimp rate, stress is not concentrated on the conductive
yarn even during repeated stretching assuming the time of wearing, so that the conductive
polymer does not deteriorate due to rubbing between yarns. As a result of which the
conductive performance after long-term wearing can be maintained. Here, when the crimp
rate of the conductive composite textured yarn is less than 10%, the stress applied
to the conductive yarn during repeated stretching increases, and the conductive component
is partially broken, whereby the conductive performance deteriorates. When the crimp
rate of the conductive composite textured yarn exceeds 55%, the crimps are too strong,
the conductive yarn protrudes from the fabric surface, the conductive yarn is cut
by abrasion during repeated washing, whereby the conductive performance deteriorates.
The crimp rate of the conductive composite textured yarn is more preferably 15 to
50%.
[0028] On the other hand, it is important that the conductive yarn a be a non-crimped yarn.
Here, the non-crimped yarn is a yarn that is not crimped. When the conductive yarn
a is a non-crimped yarn, the conductive yarn a easily comes out on the surface in
the opening section as the conductive composite textured yarn, so that the conductive
performance as the conductive composite textured yarn is improved. When crimping is
applied to the conductive yarn a, the conductive component is often partially broken
during crimping, the crimps of the conductive yarn are straightened during repeated
stretching, and the conductive yarn is buried in the fabric, whereby the problem of
deterioration of the conductive performance occurs.
[0029] In regard to the boiling-water shrinkage rate of the conductive yarn a and the non-conductive
yarn b used in the present invention, it is preferable that the boiling-water shrinkage
rate of the conductive yarn a be lower. In this way, even if thermal shrinkage of
the conductive yarn occurs, it is avoidable the problem that the conductive yarn is
buried in the conductive composite textured yarn, thereby deteriorating the surface
electric resistance.
[0030] The mass mixing ratio between the conductive yarn a and the non-conductive yarn
b in the conductive composite textured yarn is preferably from 5 : 95 to 50 : 50 from
the viewpoint of achieving both conductive performance and cost.
[0031] The conductive composite textured yarn is preferably subjected to twisting. By performing
twisting, the variation in crimp development of the conductive composite textured
yarn in the fabric is reduced, and the frequency of the conductive yarn a to be exposed
on the fabric surface can be stabilized even during repeated stretching. Here, the
number of twists is preferably 100 to 1500 (T/M).
[0032] When false twisting is applied to the non-conductive yarn b, it is preferable that
the twisting direction in the conductive composite textured yarn and the false twisting
direction of the non-conductive yarn b be opposite because the development of the
crimped coil is increased during dyeing, and the conductive yarn a is easily exposed
on the fabric surface.
[0033] The conductive composite textured yarn of the present invention described above is
preferably woven into, for example, a fabric. For the purpose of exhibiting conductivity,
a fabric may be composed of only a conductive yarn, but in order to exhibit conductivity
at low cost and obtain wearing comfort such as stretchability and texture, it is important
to use both the conductive composite textured yarn and the non-conductive textured
yarn and to arrange them in a lattice pattern at intervals.
[0034] As for the interval (pitch of the lattice interval arrangement) at which the conductive
composite textured yarns are inserted and arranged, the conductive characteristics
are better as the interval is narrower, but it is preferable to insert and arrange
the conductive composite textured yarns at an interval of about 1 to 20 mm in consideration
of the balance between the conductive characteristics and the texture, aesthetics,
quality, cost, and the like. It is more preferable to insert and arrange the conductive
composite textured yarns at intervals of about 2 to 10 mm. When the arrangement interval
of the conductive composite textured yarns is less than 1 mm, the number of the conductive
composite textured yarns arranged is large, the texture and appearance/quality deteriorate,
and the production cost of the conductive composite textured yarn may be increased.
In addition, when the arrangement interval exceeds 20 mm, it is necessary to widen
the seam margin width in order not to deteriorate the surface resistance across the
seam, which is not preferable from the viewpoint of the production cost of the fabric.
[0035] The non-conductive textured yarn used in the fabric of the present invention is preferably
a yarn having crimps in at least a part thereof. The textured yarn may be a polyester
fiber or a nylon fiber, but is preferably a polyester fiber having high crimp durability.
Specific examples of the non-conductive textured yarn include, but are not limited
to, fibers of aromatic polyesters such as polyethylene terephthalate, polypropylene
terephthalate, and polybutylene terephthalate, and fibers of aliphatic polyesters
such as polylactic acid and polyglycolic acid. Among these, fibers of polyethylene
terephthalate, polypropylene terephthalate, and polybutylene terephthalate are preferable
because they are excellent in mechanical properties and their crimps are durable.
In addition, fibers of polyethylene terephthalate are preferable because washing durability
inherent in polyester fibers can be obtained.
[0036] As polyethylene terephthalate which constitutes the non-conductive textured yarn,
it is possible to use a polyester which contains terephthalic acid as the main acid
component and ethylene glycol as the main glycol component and 90 mol% or more of
which is composed of ethylene terephthalate repeating units. However, it may contain
a copolymerization component capable of forming another ester bond within a range
in which the effect of the present invention is not inhibited. Examples of the copolymerizable
compound include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic
acid, adipic acid, dimer acid, sebacic acid, and sulfonic acid.
[0037] In addition, the non-conductive textured yarn can be selected from those having any
cross section shape, for example, a polygonal shape, a diverse shape, or a hollow
shape, such as a round shape, a triangular shape, a flat shape, a hexagonal shape,
an L-shape, a T-shape, a W-shape, an octafoil shape, or a dog-bone shape.
[0038] The crimps to be imparted to the non-conductive textured yarn may be imparted by
any method such as a false twisting method, a stuffing box method, a knit de knit
method, or a bimetal structure, but crimps by a false twisting method are preferable
because of the high crimp durability during wearing. When crimps are imparted by using
a bimetal structure, the textured yarn preferably has a bimetal structure of polyethylene
terephthalate and polypropylene terephthalate or a bimetal structure of polyethylene
terephthalate and polybutylene terephthalate.
[0039] The total fineness of the non-conductive textured yarn is preferably 56 to 400 dtex
from the viewpoint of imparting minimum tension and elasticity to the fabric. Here,
when the total fineness is less than 56 dtex, a load is applied to the conductive
yarn during repeated wearing, and the conductive performance may deteriorate, which
is not preferable. When it exceeds 400 dtex, the texture is too hard, which is not
preferable.
[0040] The single yarn fineness of each non-conductive textured yarn is preferably 0.5 to
10 dtex from the viewpoint of imparting minimum tension and elasticity to the fabric.
Here, when the single yarn fineness is less than 0.5 dtex, fuzz is generated on the
yarn which is subjected to repeated washing and abrasion and the conductivity is easily
inhibited, which is not preferable. When the single yarn fineness exceeds 10 dtex,
the fibers are too thick and the texture tends to be hard, which is not preferable.
[0041] In the fabric of the present invention, the non-conductive textured yarn preferably
has crimps in at least a part thereof. Since both the conductive composite textured
yarn and the non-conductive textured yarn have crimps, stress is not concentrated
on the conductive yarn even during repeated stretching assuming the time of wearing,
so that deterioration due to rubbing between yarns can be prevented. As a result of
which the conductive performance can be maintained. Here, the crimp rate of the non-conductive
textured yarn is preferably 10 to 60%, and more preferably 10 to 55%.
[0042] The non-conductive textured yarn used in the fabric of the present invention is preferably
entangled. By intermittently applying entanglement in the longitudinal direction of
the yarn, the single yarns of the non-conductive textured yarn are more mixed with
each other, and the charge of the conductive yarn can be efficiently transferred even
during repeated stretching. A preferred degree of entanglement here is 30 to 100 (entangled
parts/m).
[0043] The non-conductive textured yarn is preferably subjected to twisting. By applying
twisting, the variation in crimp development of the non-conductive textured yarn in
the fabric is reduced, and the frequency of the conductive yarn a to be exposed on
the fabric surface can be stabilized. Here, the number of twists is preferably 100
to 1200 (T/M).
[0044] Further, the fabric of the present invention preferably satisfies the following relationship:
total fineness (dtex) of conductive composite textured yarn - total fineness (dtex)
of non-conductive textured yarn > 0. When this relationship is satisfied, the charge
of the conductive yarn is efficiently transferred on the fabric surface, and the conductive
performance is easily maintained. Here, when the total fineness (dtex) of the conductive
composite textured yarn - the total fineness (dtex) of the non-conductive textured
yarn is less than 0, the conductive yarn is buried in the non-conductive yarn as the
base structure, whereby the conductive performance is also likely to deteriorate.
When the total fineness (dtex) of the conductive composite textured yarn - the total
fineness (dtex) of the non-conductive textured yarn exceeds 100, the convex portion
of the conductive yarn becomes too large, whereby the conductive yarn is easily damaged
due to friction during washing or wearing, and the conductive performance is also
likely to deteriorate.
[0045] The fabric of the present invention preferably has a surface resistance value of
10
10 Q or less in the method described in IEC 61340-5-1, 5-2 after 100 times of industrial
washing and after 100 times of repeated stretching in the bias direction. Conventionally,
as required characteristics of static electricity management, surface resistance values
of conductive garments have been standardized in International Electrotechnical Commission
(IEC) 61340-5-1, 5-2, and surface electrical continuity over the entire garments is
required. In recent years, customer demands for the surface resistance value have
increased, and customers require a highly durable fabric that satisfies the surface
resistance value even in a state where wearing and washing are repeated. Thus, the
surface resistance value after 100 times of industrial washing assuming repeated washing
is also required as one of the results. In the fabric of the present invention, the
surface resistance value in the method described in IEC 61340-5-1, 5-2 after 100 times
of industrial washing can be 10
10 Q or less, and high conductive performance can be exhibited even after industrial
washing. The surface resistance value is more preferably 10
7 Q or less. Here, when the surface resistance value in the method described in IEC
61340-5-1, 5-2 after 100 times of industrial washing exceeds 10
10 Q, industrial washing durability is poor, which is not preferable.
[0046] Further, the results after only repeated washing may not match the results after
the actual repeated wearing evaluation. In the fabric after the actual wearing evaluation,
a part of the conductive yarn is stretched and broken, and the conductive performance
may deteriorate. The authors have found that the fabric test for reproducing the repeated
wearing evaluation results is a repeated stretching test in the fabric bias direction.
Thus, in the evaluation of the fabric, the industrial wash 100 time test and the repeated
stretching 100 time test in the fabric bias direction are performed as pretreatment
before the IEC surface resistance value test. In the present invention, when the surface
resistance value in the method described in IEC 61340-5-1, 5-2 after these tests is
10
10 Q or less, high conductive performance can be satisfied even after repeated wearing,
which is preferable. The surface resistance value is more preferably 10
7 Q or less. When the surface resistance value in the method described in IEC 61340-5-1,
5-2 after the repeated stretching test in the fabric bias direction exceeds 10
10 Q, the repeated wearing durability is poor, which is not preferable.
[0047] Next, a method for producing the conductive composite textured yarn of the present
invention will be described.
[0048] The non-conductive yarn b and the non-conductive textured yarn used in the present
invention are preferably crimped by false twisting. Any conditions can be selected
for false twisting, and any one of a spindle type, a friction disk type, and a belt
nip type may be used as the twister. The false twist temperature can be 170 to 220°C
in the case of the contact type heater, and a higher false twist temperature is preferable
in terms of crimp durability. The number of false twists can be set such that the
false twist coefficient (the number of false twists (T/M) × fineness (dtex)
0.5) falls within the range of 18000 to 33000. A higher false twist coefficient is preferable
in terms of crimp durability.
[0049] Although a higher yarn processing speed is preferred because of higher productivity,
the yarn processing speed is preferably 100 to 800 (m/min) in consideration of stable
processability.
[0050] In order to obtain the conductive composite textured yarn of the present invention,
the conductive yarn a and the non-conductive yarn b can be combined using any mixing
means such as interlacing or Taslan processing, but the interlacing is suitable because
it can periodically impart opening and convergence and strong entanglement to the
textured yarn. In the mixing in the interlacing method, the feed rate of each yarn
(yarn feeding rate), the nozzle type for entanglement, and the pressure flow rate
are appropriately set, but it is preferable that the feed rate be set to be equal
between the conductive yarn a and the non-conductive yarn b, or the feed rate of the
conductive yarn a be set to be higher than that of the non-conductive yarn b by about
0.1 to 3.0%. When the feed rate of the conductive yarn a is smaller than that of the
non-conductive yarn b, the conductive component of the interlaced conductive yarn
a is likely to be buried, whereby the surface electric resistance in the case of a
fabric may deteriorate.
[0051] The entanglement pressure of interlacing is preferably 0.2 to 0.5 MPa. When the compressed
air of the nozzle exceeds 0.5 MPa, excessive entanglement may occur, thereby increasing
the rough and hard touch. When the compressed air of the nozzle is less than 0.2 MPa,
the number of contacts between the conductive yarns decreases, and the surface electric
resistance of the fabric may deteriorate, which is not preferable.
[0052] When the conductive composite textured yarn and the non-conductive textured yarn
to be used in the present invention are subjected to twisting, any conditions can
be selected, but it is preferable to use a double twister having high productivity.
[0053] Examples of the loom used for weaving include, but are not particularly limited to,
looms such as ordinary looms, rapier looms, water jet looms, and air jet looms that
are generally used.
[0054] Next, the dyeing processing of the fabric will be described. The dyeing processing
step can be performed in accordance with a general polyester fabric dyeing step and
conditions. In order to suppress washing shrinkage, the intermediate set temperature
is preferably 160°C or more and 210°C or less. When it exceeds 210°C, the filaments
may be fused, which is not preferable.
[0055] In addition to a method using a batch type dyeing machine such as a jet dyeing machine,
an air flow dyeing machine, a jigger dyeing machine, a wince dyeing machine, or a
beam dyeing machine, the dyeing can be performed using a well-known method such as
continuous dyeing by a padding method or textile printing, for example, a flat screen,
a rotary screen, or an inkjet.
[0056] The fabric of the present invention can also be improved in antistatic properties
by performing durable antistatic finish. In the durable antistatic finish, for example,
a film can be formed on the surface of the fabric using an antistatic polyurethane
resin, an antistatic polyester resin, an antistatic acrylic resin, an antistatic polyolefin
resin, or the like. As the means for applying the resin, for example, any means such
as a padding method, a spraying method, a printing method, a coating method, a gravure
processing method, or a foam processing method can be employed. After dyeing, heat
resistant finish, shrink resistant finish, crease resistant finish, antibacterial
finish, deodorizing finish, anti-soil finish, water absorbency finish, softening finish,
and the like may be performed as necessary.
[0057] When a garment is made using the fabric of the present invention, stitches and seams
at the time of sewing are not limited at all. Any stitches such as lock stitches,
single chain stitches, double chain stitches, or overlock stitches can be selected.
In regard to the seams, any seams such as rolled seams, flat felled seams, interlock,
piping, or the like suitable for various applications can be used without limitation.
Among them, rolled seams of four or more layers are effective for securing contacts
between conductive yarns. Furthermore, it is also effective for improving the electrical
continuity to use a thread having a lowered electric resistance value, for example,
a conductive thread as the sewing thread.
EXAMPLES
[0058] Next, the present invention will be described specifically with reference to examples,
but the present invention is not limited to these examples. Various measurement methods
in the present invention are as follows.
1. Specific resistance value
[0059] The yarns were bundled to be 2000 dtex, sufficiently refined using a weak anionic
detergent to remove an oil agent and the like, and then left to stand at 20°C and
43% RH (relative humidity) for 24 hours. Thereafter, a conductive coating material
(Dotite) was applied to both ends of the yarns and the ends were fixed. Using the
ends as electrodes, a current value at an applied voltage of 500 V was then measured
to determine a specific resistance value.
2. Fineness
[0060] A skein was produced by using a skein winder having a frame circumference of 1.0
m and rotating it 100 times, and the fineness was measured according to the following
formula.

3. Degree of entanglement
[0061] The degree of entanglement is the number of entangled parts per 1 m under a tension
of 0.1 cN/dtex. When a non-entangled part of the yarn is pierced with a pin under
a tension of 0.02 cN/dtex and the pin is moved up and down in the longitudinal direction
of the yarn with a tension of 0.1 cN/dtex over 1 m of the yarn, the part where the
pin is moved with no resistance is defined as the non-entangled part, the moved distance
is recorded, and the part where the pin stops is defined as the entangled part. This
operation is repeated 30 times, and the degree of entanglement per 1 m is calculated
from the average value of the distances of the non-entangled parts.
4. Crimp rate
[0062] The yarn is wound 10 times on a skein winder having a peripheral length of 0.8 m
under a tension of 90 mg/dtex to form a skein, then hung on a bar having a diameter
of 2 cm or less, and left for about 24 hours. The skein is wrapped in gauze, treated
with hot water at 90°C for 20 minutes under a non-tensioned state, and then hung on
a bar having a diameter of 2 cm or less and left for about 12 hours. One end of the
skein after being left to stand is hooked, an initial load and a measurement load
are applied to the other end, and the skein is suspended in water and left to stand
for 2 minutes. The initial load (g) at this time is 1.8 mg/dtex, the measurement load
(g) is 90 mg/dtex, and the water temperature is 20 12°C. The length of the inner side
of the skein that has been left is measured and designated as L. The measurement load
is removed, and only under the initial load the skein is left for another 2 minutes.
The length of the inner side of the skein that has been left is measured and designated
as L1. The crimp rate was determined by the following formula. This operation was
repeated five times, and the average value was determined.

5. Surface resistance value (initial)
[0063] In accordance with International Electrotechnical Commission (IEC) 61340-5-1, 5-2
standards, measurement was performed as follows.
[0064] Predetermined sewing is performed with a lock stitch sewing machine to prepare a
fabric sample of 50 × 50 cm including a seam. Thereafter, measurement probes of a
surface resistance value meter (Model 152AP-5P manufactured by TREK JAPAN CO., LTD.)
are placed on the fabric sample at an interval of 30 cm with a seam interposed therebetween,
and a surface electric resistance value at an applied voltage of 100 V between two
points is measured. At this time, two points are taken in the oblique direction so
as not to include the coaxial conductive yarn of the fabric sample. This was repeated
at arbitrary three points, and the arithmetic mean thereof was calculated. Fig. 1
shows a schematic diagram of surface resistance value measurement.
6. Surface resistance value (after 100 times of industrial washing)
[0065] Industrial washing is a washing method in which treatment is performed with high
temperature water and hot air drying, and washing conditions are as follows. The detergent
and the auxiliary agent are not particularly limited, but those used in this method
are as follows. The operation of washing the fabric in accordance with JIS L 1096:
2010 F-3 method and then tumbler drying at 60°C for 30 minutes is defined as 1 industrial
washing, and 100 times of industrial washing means that this operation is repeated
100 times. In this evaluation, two fabric samples of 50 × 50 cm are prepared, and
the industrial washing is performed 100 times on the two fabric samples. Thereafter,
the two fabric samples are subjected to predetermined sewing with a lock stitch sewing
machine in accordance with the International Electrotechnical Commission (IEC) 61340-5-1,
5-2 standards, measurement probes are placed with a seam interposed therebetween at
an interval of 30 cm, and the surface electric resistance value at an applied voltage
of 100 V between the two points is measured. At this time, two points are taken in
the oblique direction so as not to include the coaxial conductive yarn of the fabric
sample. This was repeated at arbitrary three points, and the arithmetic mean thereof
was calculated.
7. Surface resistance value (surface resistance value after repeated stretching)
[0066] A fabric sample of 50 × 50 cm is prepared, and the sample is stretched to 1.5 kg
at a grip interval of 50 cm and a tensile speed of 20 cm/min in a right 45° bias direction
on a diagonal line using a constant speed stretching type tensile tester, and the
grip interval at that time is measured and defined as a stretch rate of 100%.
[0067] A new sample is prepared, and the sample is stretched to a length of a stretch rate
of 80% at a grip interval of 50 cm and a tensile speed of 20 cm/min in a right 45°
bias direction on a diagonal line, and left for 1 minute, and then returned to the
original position at the same speed, and left for 1 minute. This operation is repeated
100 times.
[0068] Thereafter, the bias direction is switched to the left 45° bias direction, and the
same operation described above is repeated 100 times.
[0069] Two 50 × 50 cm fabric samples subjected to this stretching treatment are prepared.
Thereafter, the two fabric samples are subjected to predetermined sewing with a lock
stitch sewing machine in accordance with the International Electrotechnical Commission
(IEC) 61340-5-1, 5-2 standards, measurement probes are placed with a seam interposed
therebetween at an interval of 30 cm, and the surface electric resistance value at
an applied voltage of 100 V between the two points is measured. At this time, two
points are taken in the oblique direction so as not to include the coaxial conductive
yarn of the fabric sample. This was repeated at arbitrary three points, and the arithmetic
mean thereof was calculated.
(Example 1)
[0070] PET was used as a base polymer, and conductive carbon was added thereto in an amount
of 25 wt% with respect to the total amount after the addition to obtain a polymer
A, and PET was used as a polymer B. The polymer A and the polymer B were combined
such that the weight ratio of the polymer A to the polymer B was 20 : 80 and a core-sheath
cross-sectional form in which the polymer A was exposed on the entire surface of the
fiber was obtained. By spinning at a spinning speed of 1200 m/min, then drawing at
a ratio of 3.0, and heat-treating at 150°C, a conductive yarn a (33 dtex, 6 filaments,
boiling-water shrinkage rate: 6.5%, specific resistance: 450 Ω·cm) was obtained.
[0071] Next, PET as a polymer was spun at a spinning speed of 3300 m/min to obtain a highly
oriented undrawn yarn of 300 dtex/48 filaments. Thereafter, the highly oriented undrawn
yarn was false twisted in the S direction under the conditions of a processing speed
of 500 m/min, a draw ratio of 1.8, a false twist coefficient of 31000, and a false
twist temperature of 210°C by a belt nip false twisting machine MACH 33H manufactured
by TMT MACHINERY, INC. to obtain a non-conductive yarn b (167 dtex, 48 filaments,
boiling-water shrinkage rate: 7.5%, crimp rate: 48%).
[0072] Thereafter, an interlacing treatment (nozzle pressure: 0.3 MPa, processing speed:
400 m/min) was performed at a feed rate of the conductive yarn a of 1.0% and a feed
rate of the non-conductive yarn b of 0.6% to obtain a conductive composite textured
yarn having a degree of entanglement of 58 entangled parts/m and a crimp rate of 40%.
The conductive composite textured yarn was then twisted at 800 T/M in the Z direction.
[0073] On the other hand, using a PET highly oriented undrawn yarn obtained in the same
manner as in the production of the non-conductive yarn b described above, false twisting
was performed in the S direction under the conditions of a processing speed of 500
m/min, a draw ratio of 1.8, a false twist coefficient of 31000, and a false twist
temperature of 210°C by a belt nip false twisting machine MACH 33H manufactured by
TMT MACHINERY, INC., and then interlacing treatment (nozzle pressure: 0.2 MPa) was
performed to obtain a non-conductive textured yarn (yarn different from non-conductive
yarn b, 167 dtex, 48 filaments, boiling-water shrinkage rate: 7.3%, crimp rate: 45%,
degree of entanglement: 43 entangled parts/m). The non-conductive textured yarn was
then twisted at 800 T/M in the Z direction.
[0074] Next, the non-conductive textured yarns were used as warp and weft yarns for forming
the ground weave of the fabric, and a plain weave was woven by arranging the conductive
composite textured yarns such that the arrangement interval of the conductive composite
textured yarns was 5 mm for both warp and weft. In the dyeing processing, general
scouring, intermediate setting, jet dyeing, and finish setting were performed by a
standard method to obtain a plain fabric having a density of 90 × 76 yarns/2.54 cm.
[0075] Thereafter, the obtained fabric was sewn with a sewing machine, obtaining various
data of the surface resistance value (see Table 1). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had outstanding conductive performance even after industrial washing or repeated stretching
(repeated wearing evaluation).
(Example 2)
[0076] A fabric was obtained in the same manner as in Example 1 except that the conductive
composite textured yarn and the non-conductive textured yarn were not twisted.
[0077] Thereafter, the obtained fabric was sewn with a sewing machine, obtaining various
data of the surface resistance value (see Table 1). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had excellent conductive performance even after industrial washing or repeated stretching.
(Example 3)
[0078] A fabric was obtained in the same manner as in Example 1 except that the non-conductive
textured yarn was not entangled.
[0079] Thereafter, the obtained fabric was sewn with a sewing machine, obtaining various
data of the surface resistance value (see Table 1). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had excellent conductive performance even after industrial washing or repeated stretching.
(Example 4)
[0080] PET as a polymer was spun at a spinning speed of 3300 m/min to obtain a highly oriented
undrawn yarn of 350 dtex/48 filaments. Thereafter, the highly oriented undrawn yarn
was false twisted in the S direction under the conditions of a processing speed of
500 m/min, a draw ratio of 1.8, a false twist coefficient of 31000, and a false twist
temperature of 210°C by a belt nip false twisting machine MACH 33H manufactured by
TMT MACHINERY, INC. to obtain a non-conductive textured yarn (yarn different from
non-conductive yarn b, 220 dtex, 48 filaments, boiling-water shrinkage rate: 8.7%,
crimp rate: 55%, degree of entanglement: 50 entangled parts/m). The non-conductive
textured yarn was then twisted at 500 T/M in the Z direction.
[0081] A fabric was obtained in the same manner as in Example 1 except for the above.
[0082] Thereafter, the obtained fabric was sewn with a sewing machine, obtaining various
data of the surface resistance value (see Table 1). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had excellent conductive performance even after industrial washing or repeated stretching.
(Example 5)
[0083] A conductive yarn a was obtained in the same manner as in Example 1. Further, PET
as a polymer was spun at a spinning speed of 3300 m/min to obtain a highly oriented
undrawn yarn of 300 dtex/48 filaments. Thereafter, the highly oriented undrawn yarn
was false twisted in the S direction under the conditions of a processing speed of
100 m/min, a draw ratio of 1.8, a false twist coefficient of 33000, and a false twist
temperature of 215°C by a pin false twisting machine TH 312 manufactured by Aiki Seisakusyo
Ltd, thereby obtaining a non-conductive yarn b (167 dtex, 48 filaments, boiling-water
shrinkage rate: 7.2%, crimp rate: 58%). Thereafter, an interlacing treatment (nozzle
pressure: 0.35 MPa, processing speed: 400 m/min) was performed at a feed rate of the
conductive yarn a of 1.4% and a feed rate of the non-conductive yarn b of 1.0% to
obtain a conductive composite textured yarn having a degree of entanglement of 128
entangled parts/m and a crimp rate of 49%. The conductive composite textured yarn
was then twisted at 800 T/M in the Z direction.
[0084] On the other hand, a PET highly oriented undrawn yarn obtained in the same manner
as in the production of the non-conductive yarn b was false twisted, and then subjected
to an interlacing treatment (nozzle pressure: 0.3 MPa) to obtain a non-conductive
textured yarn (yarn different from non-conductive yarn b, 167 dtex, 48 filaments,
boiling-water shrinkage rate: 7%, crimp rate: 56%, degree of entanglement: 80 entangled
parts/m). The non-conductive textured yarn was then twisted at 800 T/M in the Z direction.
[0085] A fabric was obtained in the same manner as in Example 1 except for the above.
[0086] Thereafter, the obtained fabric was sewn with a sewing machine, obtaining various
data of the surface resistance value (see Table 1). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had outstanding conductive performance even after industrial washing or repeated stretching.
(Example 6)
[0087] A conductive yarn a was obtained in the same manner as in Example 1. Further, PET
as a polymer was spun at a spinning speed of 3300 m/min to obtain a highly oriented
undrawn yarn of 300 dtex/48 filaments. Thereafter, the highly oriented undrawn yarn
was false twisted in the S direction under the conditions of a processing speed of
500 m/min, a draw ratio of 1.8, a false twist coefficient of 27000, and a false twist
temperature of 180°C by a belt nip false twisting machine MACH 33H manufactured by
TMT MACHINERY, INC. to obtain a non-conductive yarn b (167 dtex, 48 filaments, boiling-water
shrinkage rate: 9.3%, crimp rate: 26%). Thereafter, an interlacing treatment (nozzle
pressure: 0.15 MPa, processing speed: 400 m/min) was performed at a feed rate of the
conductive yarn a of 0.5% and a feed rate of a non-conductive yarn b of 0.5% to obtain
a conductive composite textured yarn having a degree of entanglement of 24 entangled
parts/m and a crimp rate of 15%. The conductive composite textured yarn was then twisted
at 150 T/M in the S direction.
[0088] On the other hand, a PET highly oriented undrawn yarn obtained in the same manner
as in the production of the non-conductive yarn b was false twisted, and then subjected
to an interlacing treatment (nozzle pressure: 0.3 MPa) to obtain a non-conductive
textured yarn (yarn different from non-conductive yarn b, 167 dtex, 48 filaments,
boiling-water shrinkage rate: 9.3%, crimp rate: 25%, degree of entanglement: 14 entangled
parts/m). The non-conductive textured yarn was then twisted at 150 T/M in the S direction.
[0089] A fabric was obtained in the same manner as in Example 1 except for the above.
[0090] Thereafter, the obtained fabric was sewn with a sewing machine, obtaining various
data of the surface resistance value (see Table 1). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had excellent conductive performance even after industrial washing or repeated stretching.
(Comparative Example 1)
[0091] A conductive yarn a and a non-conductive yarn b were obtained in the same manner
as in Example 1. Thereafter, the conductive yarn a and the non-conductive yarn b were
aligned, and twisted at 800 T/M in the Z direction with a down twister to obtain a
conductive twisted yarn. Note that the interlacing treatment was not performed.
[0092] A fabric was obtained in the same manner as in Example 1 except for the above.
[0093] Thereafter, the obtained fabric was sewn with a sewing machine to obtain various
data of the surface resistance value (see Table 2). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had favorable initial conductive performance, but had significantly deteriorated conductive
performance after industrial washing.
(Comparative Example 2)
[0094] A conductive yarn a was obtained in the same manner as in Example 1. Further, PET
as a polymer was spun at a spinning speed of 3300 m/min to obtain a highly oriented
undrawn yarn of 300 dtex/48 filaments. Thereafter, the highly oriented undrawn yarn
was drawn by a drawing machine under the conditions of a processing speed of 800 m/min,
a draw ratio of 1.8, and a hot plate temperature of 210°C to obtain a non-conductive
yarn b (167 dtex, 48 filaments, boiling-water shrinkage rate: 7%, crimp rate: 0%).
Thereafter, an interlacing treatment (nozzle pressure: 0.3 MPa, processing speed:
400 m/min) was performed at a feed rate of the conductive yarn a of 1.0% and a feed
rate of the non-conductive yarn b of 0.6% to obtain a conductive composite textured
yarn having a degree of entanglement of 38 entangled parts/m and a crimp rate of 0%.
The conductive composite textured yarn was then twisted at 800 T/M in the Z direction.
[0095] A fabric was obtained in the same manner as in Example 1 except for the above.
[0096] Thereafter, the obtained fabric was sewn with a sewing machine to obtain various
data of the surface resistance value (see Table 2). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had favorable initial conductive performance, but had significantly deteriorated conductive
performance after the repeated stretching test.
(Comparative Example 3)
[0097] A conductive yarn a was obtained in the same manner as in Example 1. Further, PET
as a polymer was spun at a spinning speed of 3300 m/min to obtain a highly oriented
undrawn yarn of 300 dtex/48 filaments. Thereafter, the highly oriented undrawn yarn
was false twisted in the S direction under the conditions of a processing speed of
500 m/min, a draw ratio of 1.8, a false twist coefficient of 31000, and a false twist
temperature of 210°C by a belt nip false twisting machine MACH 33H manufactured by
TMT MACHINERY, INC., and then subjected to reheat setting under the condition of 180°C
to obtain a non-conductive yarn b (167 dtex, 48 filaments, boiling-water shrinkage
rate: 4.5%, crimp rate: 20%). Thereafter, an interlacing treatment (nozzle pressure:
0.2 MPa, processing speed: 400 m/min) was performed at a feed rate of the conductive
yarn a of 1.0% and a feed rate of the non-conductive yarn b of 0.6% to obtain a conductive
composite textured yarn having a degree of entanglement of 25 entangled parts/m and
a crimp rate of 8%. The conductive composite textured yarn was then twisted at 800
T/M in the Z direction.
[0098] On the other hand, a non-conductive textured yarn (167 dtex, 48 filaments, boiling-water
shrinkage rate: 4.5%, crimp rate: 20%) was obtained in the same manner as in the production
of the non-conductive yarn b. The non-conductive textured yarn was then twisted at
800 T/M in the Z direction.
[0099] A fabric was obtained in the same manner as in Example 1 except for the above.
[0100] Thereafter, the obtained fabric was sewn with a sewing machine to obtain various
data of the surface resistance value (see Table 2). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had favorable initial conductive performance, but had significantly deteriorated conductive
performance after the repeated stretching test.
(Comparative Example 4)
[0101] A non-conductive textured yarn was obtained in the same manner as in Example 1. Thereafter,
the non-conductive textured yarn was twisted at 800 T/M in the S direction. A plain
weave was woven using the non-conductive textured yarns as warp and weft yarns for
forming the ground weave of the fabric. In the dyeing processing, general scouring,
intermediate setting, jet dyeing, and finish setting were performed by a standard
method to obtain a plain fabric having a density of 90 × 76 yarns/2.54 cm.
[0102] Thereafter, the obtained fabric was sewn with a sewing machine to obtain various
data of the surface resistance value (see Table 2). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had low initial conductive performance.
(Comparative Example 5)
[0103] A conductive yarn a was obtained in the same manner as in Example 1. Next, a non-conductive
yarn b was obtained in the same manner as in Comparative Example 2. Thereafter, the
conductive yarn a and the non-conductive yarn b were aligned, and false twisted in
the Z direction under the conditions of a processing speed of 500 m/min, a draw ratio
of 1.02, a false twist coefficient of 31000, and a false twist temperature of 180°C
by a belt nip false twisting machine MACH 33H manufactured by TMT MACHINERY, INC.,
and then interlacing treatment (nozzle pressure: 0.3 MPa) was performed at a feed
rate of 0.6% to obtain a conductive composite textured yarn having 203 dtex/54 filaments,
a degree of entanglement of 43 entangled parts/m, and a crimp rate of 37%. The conductive
composite textured yarn was then twisted at 800 T/M in the Z direction.
[0104] On the other hand, a non-conductive textured yarn having 167 dtex/48 filaments, a
boiling-water shrinkage rate of 7.3%, and a crimp rate of 45% was obtained in the
same manner as in the production method of Example 1. The non-conductive textured
yarn was then twisted at 800 T/M in the Z direction.
[0105] A fabric was obtained in the same manner as in Example 1 except for the above.
[0106] Thereafter, the obtained fabric was sewn with a sewing machine to obtain various
data of the surface resistance value (see Table 2). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had favorable initial conductive performance, but had significantly deteriorated conductive
performance after the repeated stretching test.
(Comparative Example 6)
[0107] A conductive yarn a was obtained in the same manner as in Example 1. PBT as a polymer
was spun at a spinning speed of 3300 m/min to obtain a highly oriented undrawn yarn
of 300 dtex/48 filaments. Thereafter, the highly oriented undrawn yarn was false twisted
in the S direction under the conditions of a processing speed of 100 m/min, a draw
ratio of 1.8, a false twist coefficient of 35000, and a false twist temperature of
215°C by a pin false twisting machine TH 312 manufactured by Aiki Seisakusyo Ltd,
thereby obtaining a non-conductive yarn b (167 dtex, 48 filaments, boiling-water shrinkage
rate: 8.5%, crimp rate: 64%). Thereafter, an interlacing treatment (nozzle pressure:
0.2 MPa, processing speed: 400 m/min) was performed at a feed rate of the conductive
yarn a of 1.0% and a feed rate of the non-conductive yarn b of 0.6% to obtain a conductive
composite textured yarn having a degree of entanglement of 55 entangled parts/m and
a crimp rate of 57%. The conductive composite textured yarn was then twisted at 800
T/M in the Z direction.
[0108] On the other hand, a PET highly oriented undrawn yarn obtained in the same manner
as in the production of the non-conductive yarn b was false twisted, and then subjected
to an interlacing treatment (nozzle pressure: 0.2 MPa) to obtain a non-conductive
textured yarn (yarn different from non-conductive yarn b, 167 dtex, 48 filaments,
boiling-water shrinkage rate: 8.5%, crimp rate: 64%, degree of entanglement: 48 entangled
parts/m). The non-conductive textured yarn was then twisted at 800 T/M in the Z direction.
[0109] A fabric was obtained in the same manner as in Example 1 except for the above.
[0110] Thereafter, the obtained fabric was sewn with a sewing machine to obtain various
data of the surface resistance value (see Table 2). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had favorable initial conductive performance, but had significantly deteriorated conductive
performance after industrial washing.
(Comparative Example 7)
[0111] A conductive yarn a and a non-conductive yarn b were obtained in the same manner
as in Example 1. Thereafter, an interlacing treatment (nozzle pressure: 0.55 MPa,
processing speed: 400 m/min) was performed at a feed rate of the conductive yarn a
of 1.5% and a feed rate of the non-conductive yarn b of 1.5% to obtain a conductive
composite textured yarn having a degree of entanglement of 155 entangled parts/m and
a crimp rate of 32%. The conductive composite textured yarn was then twisted at 800
T/M in the Z direction.
[0112] On the other hand, a PET highly oriented undrawn yarn obtained in the same manner
as in the production of the non-conductive yarn b was false twisted, and then subjected
to an interlacing treatment (nozzle pressure: 0.4 MPa) to obtain a non-conductive
textured yarn (yarn different from non-conductive yarn b, 167 dtex, 48 filaments,
boiling-water shrinkage rate: 7%, crimp rate: 39%, degree of entanglement: 108 entangled
parts/m). The non-conductive textured yarn was then twisted at 800 T/M in the Z direction.
[0113] A fabric was obtained in the same manner as in Example 1 except for the above.
[0114] Thereafter, the obtained fabric was sewn with a sewing machine to obtain various
data of the surface resistance value (see Table 2). In addition, a garment (blouson)
made using the obtained fabric by predetermined sewing with a lock stitch sewing machine
had low initial conductive performance.
[Table 1]
[0115]

[Table 2]
[0116]

INDUSTRIAL APPLICABILITY
[0117] According to the present invention, a fabric excellent in conductivity and wearing
durability thereof can be provided. As a result, the fabric can be suitably used for
garments such as uniforms, hats, dust-proof garments, and other antistatic applications.
DESCRIPTION OF REFERENCE SIGNS
[0118]
- 1: Measurement probe (linear distance between probes: 30 cm)
- 2: Flat felled seam part
- 3: Surface resistance detector