JP2022183505A - Stretch woven fabric - Google Patents

Abstract

To provide a stretch woven fabric which has a characteristic of eliminating degradation of pilling resistance due to repeated washing, such a characteristic having been unachievable so far, and which also has good bounce and resilience.SOLUTION: A stretch woven fabric comprises a spun yarn as a warp yarn and a composite false-twisted yarn as a weft yarn. The composite false-twisted yarn is formed by combining a polyester false-twisted yarn A and a polyester false-twisted yarn B which are obtained by separately false-twisting in the same direction, and have the number of entangling of 30/m or more, the number of torque twisting of 40 T/m or more, and the percentage of crimp of 30% or more.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a stretch woven fabric having excellent pilling resistance even after repeated washing for a long period of time.

Fibers using thermoplastic polymers such as polyesters and polyamides have various excellent properties such as mechanical properties and dimensional stability. Therefore, it is used in various fields such as clothing, interiors, vehicle interiors, and industrial materials. On the other hand, with the diversification of uses of fibers, the properties required thereof have also become diversified.

In recent years, in particular, there has been a demand for restraint of feeling of restraint when worn and followability of movement, and demand for stretch performance of clothes, etc. has increased, and various stretch products have come to the market. In particular, woven fabrics that use spun yarn for part of the warp have a soft and fluffy texture and surface feel, and are suitable for uniform materials, casual materials, sports materials, etc., and are stretchable. There is also an increasing demand for

Conventionally, various methods have been proposed for imparting stretchability to raw yarns constituting woven fabrics. For example, there is a method of imparting stretchability to a woven fabric by using a normal false twisted yarn as the weft. However, in fabrics that use spun yarn as part of the warp, in order to develop stretchability in the weft direction, it is necessary to weaken the tension in the warp direction during the dyeing process. There was a problem of degraded quality. Furthermore, there is a problem that the fluff of the warp and the crimp of the weft become entangled due to friction and impact due to repeated washing, resulting in deterioration of pilling resistance.

There is also a method of adding stretchability to the weft by mixing polyurethane fibers. However, there are problems such as poor color fastness, easy discoloration and color transfer, and deterioration of strength due to repeated use.

A woven or woven fabric of latent crimp-developing fibers using a side-by-side composite yarn has also been proposed. For example, Patent Literature 1 proposes a latently crimpable conjugate fiber that is a conjugate fiber obtained by laminating two components of polymers having different viscosities in a side-by-side manner. When such latently crimpable conjugate fibers are used, the fibers are largely curved toward the high-shrinkage component side after heat treatment, so that the continuous fibers form a three-dimensional coil structure. For this reason, the structure expands and contracts like a spring, and stretchability can be imparted to the woven fabric. However, these side-by-side type conjugate fibers have the problem that the coil crimps pop out on the surface of the fabric due to friction and impact due to repeated washing, and peeling occurs at the conjugate fiber interface, resulting in a decrease in pilling resistance.

Further, Patent Document 2 discloses an eccentric core-sheath composite fiber in which the a component is completely covered with the b component in the cross section of the eccentric core-sheath composite fiber made of two types of polymers, the a component and the b component. have been proposed, and wear resistance is taken into account. However, even in this method, there is a problem that the coil crimp pops out on the surface of the fabric due to friction and impact due to repeated washing and entangles with the fluff of the warp, resulting in a decrease in pilling resistance.

Further, Patent Document 3 proposes a stretch fabric using a composite yarn of a false twisted crimped yarn having torque in the S direction and a false twisted crimped yarn having torque in the Z direction. It is true that this method can produce a stretchable fabric with a flat surface. There was a problem that the later pilling resistance was lowered.

JP-A-09-157941 JP 2019-214798 A JP 2009-138287 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a stretch woven fabric which eliminates the problem of conventional stretch woven fabrics, namely pilling resistance after repeated washing, and which has excellent elasticity.

In order to solve such problems, the stretch fabric of the present invention has the following configuration. i.e.
A woven fabric containing spun yarns as warps and composite false twisted yarns as wefts, wherein the composite false twisted yarns have a yarn form in which polyester false twisted yarns A and polyester false twisted yarns B are separately false twisted in the same direction, and the composite false twisted yarns are combined. The stretch fabric satisfies 30 twisted yarns/m or more, a torque twist number of 40 T/m or more, and a crimp rate of 30% or more.

In the stretch fabric of the present invention, the polyester false twisted yarn A and the polyester false twisted yarn B are preferably composed of non-conjugated yarns made of polyethylene terephthalate.

In the stretch fabric of the present invention, it is preferred that the polyester false twisted yarn A and the polyester false twisted yarn B are composed of the same polymer.

In the stretch fabric of the present invention, the yarn length difference of the composite false twisted yarn is preferably 3% or less.

The stretch fabric of the present invention preferably has a pilling level of 3.5 or higher after repeated washing.

According to the present invention, it is possible to obtain a stretch woven fabric that eliminates the pilling resistance after repeated washing, which could not be obtained in the past, and has excellent firmness and stiffness.

The stretch fabric of the present invention is a fabric containing spun yarn as warp and composite false twist yarn as weft. By using spun yarn for the warp, it is possible to obtain a soft and voluminous fabric. There was a problem that the crimps were entangled by repeated washing and easily caused pilling.

In the present invention, as a result of intensive studies, the polyester false twisted yarn A and the polyester false twisted yarn B, which are separately false twisted in the same direction as the composite false twisted yarn of the weft, are combined, and the crimps of the polyester false twisted yarns A and B are converged. By using a composite false twisted yarn with a weft entanglement number of 30 / m or more, a torque twist number of 40 T / m or more, and a crimp rate of 30% or more Even after repeated washing, fluff of the warp spun yarn and crimps of the polyester false twisted yarns A and B of the weft do not become entangled, and a stretch fabric having excellent pilling resistance was successfully obtained.

When the number of entanglements of the composite false twisted yarn constituting the stretch fabric of the present invention is 30/m or more, the crimps in the fabric can be converged. A preferable entanglement number is 60 to 150/m. When the entanglement number is less than 30/m, the crimps of the composite false twisted yarn tend to become entangled with the fluff of the spun yarn, resulting in poor pilling resistance after repeated washing.

In addition, since the torque twist number of the composite false twisted yarn constituting the stretch fabric of the present invention is 40 T / m or more, the crimp is generated during the dyeing process and the torque is also generated at the same time, so that the crimp convergence form of the composite false twisted yarn can be maintained. A preferable torque expression number is 50 to 200 T/M or less. When the number of torque manifestations is less than 40 T/M, the torque manifestation is small during the dyeing process, and the bulkiness of the composite textured yarn is increased, so that the crimps are easily entangled with the fluff of the spun yarn, and the pilling resistance after repeated washing. worsens.

Further, by setting the crimp rate of the composite false twisted yarn constituting the stretch fabric of the present invention to 30% or more, the fabric can be imparted with high stretchability. A preferred crimp rate is 30 to 60%. If the crimp rate is less than 30%, the woven fabric cannot be provided with high stretchability.

Further, the yarn length difference of the composite false twisted yarns constituting the stretch fabric of the present invention is 3% or less. preferable. More preferably, the yarn length difference of the composite false twisted yarn is 1% or less.

It is also important that the composite false twisted yarn constituting the stretch fabric of the present invention is in the form of a composite of polyester false twisted yarn A and polyester false twisted yarn B separately false twisted in the same direction.

Examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate. Among them, polyethylene terephthalate is preferable because of stable crimping.

Further, there is no problem even if any component such as a sulfonic acid component, a dicarboxylic acid component, a diol component or an oxycarboxylic acid component is copolymerized in the polymer of the polyester false twisted yarn A and the polyester false twisted yarn B. For example, if it has an anionic site such as a sulfonic acid group, it can have cationic dyeability through interaction with a cationic dye having a cationic site. It is preferable to use a cationic dyeable polymer for both of them so as to have the same dyeability, because the color pilling caused by friction or impact due to repeated washing becomes inconspicuous.

The polyester false-twisted yarn A and the polyester false-twisted yarn B are separately false-twisted in the same direction and combined, so that the crimps of different phases overlap each other, and the fluff of the spun yarn is difficult to get entangled even after repeated washing. It is preferable because the anti-pilling property is improved.

Further, when the polyester false twisted yarn A and the polyester false twisted yarn B are composed of the same polymer, the crimp development performance is the same, only the phase is different, and the crimps overlap, which is more preferable.

Moreover, the polyester false twisted yarn A and the polyester false twisted yarn B are preferably composed of non-conjugated yarns that can easily maintain a converged crimped shape. With such a structure, the coil crimps are less likely to pop out on the surface of the woven fabric due to friction and impact due to repeated washing, and pilling resistance is improved.

The polyester false twisted yarn A and the polyester false twisted yarn B have polygonal cross-sections such as round, triangular, flat, hexagonal, L-shaped, T-shaped, W-shaped, eight-leafed and dog-bone shaped, multi-shaped and hollow cross-sections. Any shape such as a mold can be selected, but if the cross sections of A and B are the same, the crimp development performance is the same, only the phase is different, and the crimps overlap. ,preferable.

The polyester false twisted yarn A and the polyester false twisted yarn B may contain inorganic fine particles and organic compounds as a matting agent such as titanium oxide, a flame retardant, a lubricant, an antioxidant, a coloring pigment, etc., within a range not impairing the object of the present invention. Carbon black may be contained as necessary, but it is preferable to use the same content, since the crimp development performance is the same, only the phase is different, and the crimps overlap.

It is preferable that the polyester false twisted yarn A and the polyester false twisted yarn B each have a fineness of 30 to 200 dtex from the viewpoint of imparting stretchability and a feeling of fullness to the woven fabric. Here, it is more preferable that the polyester false twisted yarn A and the polyester false twisted yarn B have the same fineness because only the phases are different and the crimps overlap each other.

The polyester false twisted yarn A and the polyester false twisted yarn B each preferably have a single filament fineness of 0.5 to 7 dtex from the viewpoint of imparting stretchability and softness to the woven fabric. Here, if the polyester false twisted yarn A and the polyester false twisted yarn B have the same single filament fineness, only the phases are different, and the crimps can be overlapped, which is more preferable.

Materials for spun yarns for the warp used in the present invention include not only all ordinary synthetic fibers, but also cellulosic fibers such as acetate, regenerated cellulosic fibers, natural fibers such as cotton, silk and animal fibers. Blended yarns and the like can also be applied. Among them, a polyester blend material is preferably used because short fibers are less frayed even after repeated washing. Moreover, not only spun yarns but also spun yarns and filament arrays are preferable for the warp yarns, since pilling can be suppressed even after repeated washing.

The single fiber fineness of the spun yarn is preferably in the range of 0.5 to 10 dtex, more preferably 0.5 to 10 dtex, which is used in ordinary composite spun yarn, from the viewpoint of compatibility between spinning property and soft feel. It ranges from 7 to 4.0 dtex.

Also, the fiber length of the spun yarn is preferably in the range of 25 to 80 mm, more preferably in the range of 30 to 60 mm, from the viewpoint of quality.

The yarn count of the spun yarn is preferably in the range of 10 to 100 (cotton type), but the yarn count can be appropriately selected according to the application. For example, in the case of fabrics for clothing, 20 to 80 counts (cotton type) are preferable.

The twist coefficient of the spun yarn is preferably in the range of 2.0 to 5.0, but the twist coefficient can be appropriately selected depending on the application. Further, the twist coefficient does not need to be constant, and can be changed in the longitudinal direction of the composite spun yarn depending on the application.

The stretch fabric of the present invention can be obtained by the following manufacturing method.

When spinning the base yarn of the composite false twisted yarn constituting the stretch fabric of the present invention, it is preferable that the amorphous portion is in a highly oriented state in order to improve the crimp expression rate, and the spinning speed is preferably 2,500. ~3,800 m/min.

Subsequently, in producing the composite false-twisted textured yarn used in the present invention, the raw yarn of the polyester false-twisted yarn A and the raw yarn of the polyester false-twisted yarn B are separately spun in the same false-twisted direction (S and S-direction false twisted yarns). Twisting, or false twisting in the Z and Z directions) and post-entangling can provide a composite textured yarn with high crimp and high torque expression, and can maintain the convergence of crimps in the fabric. .

Any false twisting condition can be selected as the false twisting condition. Any of a spindle type, a friction disk type, and a belt nip type may be used as the twister, but the friction disk type is preferable because it enables high-speed false twisting and relatively little single yarn snare. If the false twisting temperature is 170 to 225° C. in the case of a contact heater, it is preferable because strong crimping can be imparted. Regarding the number of false twists, setting the false twist coefficient (number of false twists (T/M) x fineness (dtex) 0.5) in the range of 27,000 to 33,000 is effective in imparting strong crimps. It is preferable in that it can be done. Here, if the number of false twists of the false twisted yarns A and B is the same, only the phases are different and the crimps overlap, which is more preferable.

As for the entangling condition, the entangling pressure is preferably 0.25 to 0.5 MPa in consideration of the balance between stretchability and convergence.

As for the yarn processing speed, the higher the productivity, the better.

The composite false-twisted textured yarn used in the present invention can be twisted using any twisting machine such as a down twister or a double twister. Preferably. More preferably, it is untwisted.

The stretch fabric of the present invention can be exemplified by commonly used looms such as ordinary looms, rapiers, water jet looms, air jet looms, etc., but can be employed without particular limitation to these. Any weave such as plain, twill, satin, Amundsen, and double weave can be selected.

In addition, the stretch fabric of the present invention may be treated with conventional water-absorbing, water-repellent, raising, ultraviolet shielding or antibacterial agents, antiviral agents, and deodorants as long as the object of the present invention is not impaired. , an insect repellent, a retroreflector, and other functions may be additionally applied.

In the stretch fabric of the present invention, in addition to the normal pilling evaluation, the pilling after repeated washing is grade 3.5 or higher, so that pilling does not occur even in an environment where actual wear after repeated washing is assumed. difficult and desirable. More preferably, the degree of pilling after repeated washing is grade 4 or higher.

The stretch woven fabric obtained by the present invention is suitably used as clothing such as uniform material, student clothing material, casual material, sports material, formal material and the like.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples.
(1) Fineness 100 skeins were produced using a measuring machine with a frame circumference of 1.0 m, and the fineness was measured according to the following formula.

Fineness (dtex) = Skein weight (g) for 100 times x 100
(2) Degree of entanglement The degree of entanglement is the number of entangled parts per 1 m under a tension of 0.1 cN / dtex. The pin was moved up and down in the longitudinal direction of the yarn with a tension of 0.1 cN/dtex over the length of the yarn, and the portion that moved without resistance was recorded as the non-entangled portion, and the distance moved was recorded. This operation is repeated 30 times, and the degree of entanglement per meter is calculated from the average distance of the unentangled portions.
(3) Crimp rate The yarn was wound 10 times under a tension of 90 mg/dtex on a measuring machine with a circumference of 0.8 m to remove the skein, then suspended from a rod of 2 cm or less and left for about 24 hours. This skein was wrapped in gauze, treated with hot water at 90° C. for 20 minutes under tensionless conditions, and then hung from a rod of 2 cm or less and left for about 12 hours. After standing, one end of the skein was hung on a hook, and the initial load and the measurement load were applied to the other end, and the skein was suspended in water and left for 2 minutes. The initial load (g) at this time was 2 mg/dtex, the measurement load (g) was 90 mg/dtex, and the water temperature was 20±2°C. The inner length of the left skein was measured and designated as L. Furthermore, the measurement load was removed and only the initial load was applied, and the sample was allowed to stand for 2 minutes. The crimp was determined by the following formula, and this operation was repeated 5 times, and the average value was determined.

Crimp rate (%) = {(L - L1) / L} x 100
(4) Torque Twisting Number About 75 cm of composite false twisted yarn is stretched horizontally, and after an initial load of 0.02 mN/dtex is hung in the center, both ends are aligned. The yarn begins to rotate due to the residual torque, but it is held as it is until the initial load stops, and a twisted yarn is obtained. The number of twists of a 25 cm length of the twisted yarn thus obtained is measured with a twist detector under a load of 1 mN/dtex. The obtained number of twists (T/25 cm) is multiplied by four to obtain the torque (T/m).
(5) Yarn length difference About 10 cm of composite false twisted yarn is carefully disassembled into polyester false twisted yarn A and polyester false twisted yarn B, the length of the disassembled yarn is measured, and the longer one is the maximum length and the short one is the minimum length. The yarn length difference was determined by the following formula. This operation was repeated 10 times, and the average value was obtained by rounding off to the first decimal place.

Yarn length difference (%) = (maximum length - minimum length) / minimum length x 100
(6) Stretch rate (%)
The elongation rate under a load of 1.5 kgf (14.7 N) was measured according to the B method described in JIS L 1096 (2010).
(7) Evaluation of Pilling Resistance Using a 2-tank washing machine, the washing cycle was 40° C. for 5 minutes, 2 minutes for rinsing at 30° C., 2 minutes for dehydration, and 1 cycle of dehydration for 30 seconds. Kao's "Attack" (registered trademark) was used as the detergent at 1 g/L, the liquid volume was 40 L, and the total weight of the test cloth and the cotton cloth used as the guide cloth was 830 g. After repeating this washing operation 20 times, according to JIS L 1076 (2018) A method, pilling evaluation was performed and class determination was performed. Grade 3.5 or higher is considered a pass.
(8) Firmness and waist In the sensory evaluation, evaluation was performed on a 4-point scale: very excellent tension, excellent tension, slightly insufficient tension, and insufficient tension. The result was close to the average of 10 randomly selected evaluations.

<Example 1>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain two partially oriented polyethylene terephthalate yarns having a fineness of 140 dtex, 36 filaments and an elongation of 140%. Then, the two partially oriented yarns are separately S-twisted by a friction false twisting machine at a processing speed of 500 m/min, a heater temperature of 215° C., a draw ratio of 1.65 times, and a false twist coefficient of 29,000. False twisting is performed in the direction, and then interlacing is performed at an entangling pressure of 0.3 MPa, fineness: 167 dtex, number of entanglements: 68 pieces/m, number of torque twists: 52 T/m (S direction), crimp rate: 41. %, yarn length difference: 0% composite textured yarn was obtained.

In addition, polyethylene terephthalate staple fibers having a single fiber fineness of 1.45 dtex and a fiber length of 38 mm and cotton fibers were blended at a ratio of 65:35, and passed through a normal spinning process to obtain a two-ply yarn of 45/2 cotton type count. A spun yarn was obtained.

Using the spun yarn as the warp and the composite textured yarn as the weft, the 2/1 twill fabric is woven with an air jet loom. , intermediate setting at 180°C, navy blue dyeing at 130°C using disperse dyes and reactive dyes, and further finishing setting at 160°C. .54 cm).

The resulting woven fabric had a stretch rate of 18% and a pilling resistance rating of 4.5 before washing and 4.5 after washing 20 times. The woven fabric was very excellent in elasticity and elasticity.

<Example 2>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain a polyethylene terephthalate partially oriented yarn having a fineness of 140 dtex, 36 filaments and an elongation of 140%.

On the other hand, polybutylene terephthalate with a round cross section was spun at a spinning speed of 3,000 (m/min) to obtain a polybutylene terephthalate partially oriented yarn with a fineness of 140 dtex, 36 filaments and an elongation of 138%.

Then, the two partially oriented yarns are separately S-twisted by a friction false twisting machine at a processing speed of 500 m/min, a heater temperature of 210° C., a draw ratio of 1.65 times, and a false twist coefficient of 28,000. False twisting is performed in the direction, then interlacing is performed with polyethylene terephthalate as the core yarn and polybutylene terephthalate as the sheath yarn, with a core-sheath overfeed difference of 4% and an entangling pressure of 0.3 MPa, fineness: 167 dtex, entangling. A composite textured yarn having a twist number of 75 twists/m, a torque twist number of 44 T/m (S direction), a crimp rate of 41%, and a yarn length difference of 4% was obtained.

Thereafter, a woven fabric was produced in the same manner as in Example 1, and dyeing was performed to obtain a product with a finished density (warp: 125/2.54 cm, weft: 105/2.54 cm).

The resulting woven fabric has a stretch rate of 20% and a pilling resistance rating of 4.5 before washing and 3.5 after washing 20 times. The woven fabric was excellent in firmness and elasticity.

<Example 3>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain two partially oriented polyethylene terephthalate yarns having a fineness of 140 dtex, 36 filaments and an elongation of 140%. Then, the two partially oriented yarns are separately S-twisted by a pin false twisting machine at a processing speed of 100 m/min, a heater temperature of 220° C., a draw ratio of 1.65 times, and a false twist coefficient of 32,000. False twisting is performed in the direction, then interlacing is performed at an entangling pressure of 0.35 MPa, fineness: 167 dtex, number of entanglements: 93 pieces/m, number of torque twists: 68 T/m (S direction), crimp rate: 48 %, yarn length difference: 0% composite textured yarn was obtained.

Thereafter, a woven fabric was produced in the same manner as in Example 1, and dyeing was performed to obtain a product with a finished density (warp: 125/2.54 cm, weft: 105/2.54 cm).

The resulting woven fabric had a stretch rate of 25% and a pilling resistance rating of 4.5 before washing and 4.5 after washing 20 times. The woven fabric was very excellent in elasticity and elasticity.

<Comparative Example 1>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain a polyethylene terephthalate partially oriented yarn having a fineness of 280 dtex, 72 filaments and an elongation of 142%. Then, the above partially oriented yarn is false twisted in the S direction by a friction false twisting machine at a processing speed of 500 m/min, a heater temperature of 215° C., a draw ratio of 1.65 times, and a false twist coefficient of 29,000. After that, interlace processing is performed at an interlacing pressure of 0.2 MPa, and the fineness is 330 dtex, the interlacing number is 50 pieces/m, the torque twist number is 45 T/m (S direction), and the crimp rate is false twisting of 29%. A textured yarn was obtained.

Thereafter, a woven fabric was produced in the same manner as in Example 1, and dyeing was performed to obtain a product with a finished density (warp: 120/2.54 cm, weft: 105/2.54 cm).

The resulting woven fabric had a stretch rate of 8% and a pilling resistance evaluation of grade 4 before washing and grade 2.5 after washing 20 times. There was, and the firmness and waist were also somewhat insufficient.

<Comparative Example 2>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain a polyethylene terephthalate partially oriented yarn having a fineness of 280 dtex, 72 filaments and an elongation of 142%. Then, the above partially oriented yarn is processed by a friction false twisting machine at a processing speed of 500 m/min, a heater temperature of 215° C., a draw ratio of 1.65 times, and a false twist coefficient of 29,000. False twisting is performed in the Z direction, then interlacing is performed at an entangling pressure of 0.3 MPa, fineness: 330 dtex, number of entanglements: 70 pieces/m, number of torque twists: 8 T/m (S direction), crimp rate: A false twisted yarn of 38% was obtained.

Thereafter, a woven fabric was produced in the same manner as in Example 1, and dyeing was performed to obtain a product with a finished density (warp: 125/2.54 cm, weft: 105/2.54 cm).

The resulting woven fabric had a stretch rate of 16% and a pilling resistance rating of grade 4.5 before washing and grade 3 after washing 20 times. Pilling resistance was insufficient.

<Comparative Example 3>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain a polyethylene terephthalate partially oriented yarn having a fineness of 140 dtex, 36 filaments and an elongation of 140%.

On the other hand, polyethylene terephthalate obtained by copolymerizing 0.3 mol% of 5-sodium sulfoisophthalic acid with a circular cross section was spun at a spinning speed of 3,000 (m/min), and a polyethylene terephthalate portion with a fineness of 140 dtex, 36 filaments, and an elongation of 145% was obtained. An oriented yarn was obtained.

Then, the two partially oriented yarns are separately S-twisted by a friction false twisting machine at a processing speed of 500 m/min, a heater temperature of 180° C., a draw ratio of 1.65 times, and a false twist coefficient of 27,000. False twisting is performed in the direction, and then interlacing is performed at an entangling pressure of 0.3 MPa, fineness: 167 dtex, number of entanglements: 64/m, number of torque twists: 55 T/m (S direction), crimp rate: 25. %, yarn length difference: 0% composite textured yarn was obtained.

Thereafter, a woven fabric was produced in the same manner as in Example 1 and dyed to obtain a product with a finished density (warp: 122/2.54 cm, weft: 105/2.54 cm).

The resulting woven fabric had a stretch rate of 10% and a pilling resistance evaluation of grade 4.5 before washing and grade 2 after washing 20 times. There was, and the firmness and waist were also somewhat insufficient.

<Comparative Example 4>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain two partially oriented polyethylene terephthalate yarns having a fineness of 140 dtex, 36 filaments and an elongation of 140%. Then, the two partially oriented yarns are separately S-twisted by a friction false twisting machine at a processing speed of 500 m/min, a heater temperature of 215° C., a draw ratio of 1.65 times, and a false twist coefficient of 29,000. False twisting is performed in the direction, then interlacing is performed at an entangling pressure of 0.15 MPa, fineness: 167 dtex, number of entanglements: 21 pieces/m, number of torque twists: 44 T/m (S direction), crimp rate: 43 %, yarn length difference: 0% composite textured yarn was obtained.

Thereafter, a woven fabric was produced in the same manner as in Example 1, and dyeing was performed to obtain a product with a finished density (warp: 125/2.54 cm, weft: 105/2.54 cm).

The resulting woven fabric had a stretch rate of 18% and a pilling resistance rating of grade 4.5 before washing and grade 3 after washing 20 times. Pilling resistance was insufficient.

<Comparative Example 5>
First, polyethylene terephthalate having a circular cross section was spun at a spinning speed of 3,000 (m/min) to obtain a polyethylene terephthalate partially oriented yarn having a fineness of 140 dtex, 36 filaments and an elongation of 140%.

On the other hand, polyethylene terephthalate and polybutylene terephthalate were extruded from a side-by-side spinneret at a weight composite ratio of 50/50 and spun at a spinning speed of 3,500 (m/min) to produce a conjugate with a fineness of 120 dtex, 36 filaments, and an elongation of 126%. A partially oriented yarn was obtained.
Then, the two partially oriented yarns were aligned by a friction false twisting machine at a processing speed of 500 m/min, a heater temperature of 215°C, a draw ratio of 1.55 times, and a false twist coefficient of 31,000. After that, composite false twisting is performed in the S direction, and then interlacing is performed at an entangling pressure of 0.3 MPa, fineness: 162 dtex, number of entanglements: 55 / m, torque twist number: 51 T / m (S direction), winding A composite textured yarn with a shrinkage ratio of 52% and a yarn length difference of 8% was obtained.

Thereafter, a woven fabric was produced in the same manner as in Example 1, and dyeing was performed to obtain a product with a finished density (warp: 128/2.54 cm, weft: 105/2.54 cm).

The resulting woven fabric had a stretch rate of 27% and a pilling resistance rating of grade 3.5 before washing and grade 2 after washing 20 times. Pilling resistance was insufficient.

The stretch woven fabric of the present invention is suitably used as clothing for uniform materials, student clothing materials, casual materials, sports materials, formal materials, and the like.

Claims (5)

A woven fabric containing spun yarns as warps and composite false twisted yarns as wefts, wherein the composite false twisted yarns have a yarn form in which polyester false twisted yarns A and polyester false twisted yarns B are separately false twisted in the same direction, and the composite false twisted yarns are combined. A stretch woven fabric having a twisted yarn entanglement number of 30/m or more, a torque twist number of 40 T/m or more, and a crimp rate of 30% or more. 2. Stretch fabric according to claim 1, characterized in that the polyester false twisted yarn A and the polyester false twisted yarn B consist of non-conjugated yarns of polyethylene terephthalate. 3. The stretch fabric according to claim 1, wherein the polyester false twisted yarn A and the polyester false twisted yarn B are composed of the same polymer. The stretch fabric according to any one of claims 1 to 3, wherein the yarn length difference of the composite false twisted yarn is 3% or less. The stretch fabric according to any one of claims 1 to 4, wherein the pilling after repeated washing is grade 3.5 or higher.