JP7275570B2 - Stretch fabric and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a stretch woven fabric having excellent down-proof properties, and more particularly to a woven fabric capable of maintaining down-proof properties even when stretched, and a method for producing the same.

Conventionally, in the field of down fabrics and futon side fabrics, stretch fabrics with low air permeability that are excellent in the effect of reducing blowout of cotton or down (down proof properties) have been used (see Patent Document 1). Moreover, in recent years, it has been proposed to impart stretchability to a woven fabric in order to improve the wearing comfort of the woven fabric. has been proposed (see Patent Document 2). However, in the manufacturing method using false twisted crimped yarn, considering the process passability of the fabric, it is practically unavoidable to entangle the yarn, and the down is pulled out from the converged entangled part during stretching. I couldn't say that I could solve the problem.

JP 2012-057265 A JP 2014-205933 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a stretch fabric with excellent downproof properties and low air permeability.

The present invention for solving such problems has any of the following configurations.
(1) A stretch woven fabric comprising bimetallic composite yarns having an entanglement degree of 1/m or less, an elongation rate of 10% or more, and an air permeability of 1 cc/cm ² /s or less.
(2) The stretch fabric according to (1) above, wherein the single filament fineness of the bimetallic composite yarn is 0.3 dtex or less.
(3) The stretch fabric according to (1) or (2) above, wherein the bimetallic composite yarn has a total fineness of 40 dtex or less.
(4) The stretch fabric according to any one of (1) to (3), wherein one component of the bimetallic composite yarn is polytrimethylene terephthalate or polybutylene terephthalate and the other component is polyethylene terephthalate.
(5) A fabric is woven using a sea-island composite yarn whose island component is a bimetallic composite yarn, and the sea component is removed in the weaving stage to develop crimps in the polyester bimetallic composite yarn, thereby forming the fabric. A method for producing a stretch fabric, characterized by imparting stretchability.

According to the present invention, it is possible to obtain a stretch woven fabric with excellent down-proof properties and low air permeability even under stretching conditions assuming wearing, which could not be obtained conventionally.

First, it is important that the stretch fabric of the present invention has an air permeability of 1 cc/cm ² /s or less. If the air permeability is higher than 1 cc/cm ² /s, the downproof property is lowered, which is not preferable. A more preferable air permeability range is 0.01 to 1 cc/cm ² /s.

Also, it is important that the stretch fabric of the present invention has an elongation rate of 10% or more. When it is 10% or more, it is possible to obtain a comfortable stretchability when actually worn. If it is less than 10%, the stretchability is insufficient. A more preferable elongation rate range is 10% or more and less than 40%.

In such a stretch fabric of the present invention, it is important that the warp or weft comprises a bimetallic composite yarn having a degree of entanglement of 1 piece/m or less. By using a bimetallic composite yarn with an entanglement degree of 1 thread/m or less, it is possible to prevent down from coming off even when the fabric is stretched at a high degree of elongation as described above. If the degree of entanglement exceeds 1 piece/m, the down will come off at the entangled portion where the yarn converges during the stretching of the crimp.

In the stretch fabric of the present invention, the bimetallic composite yarn is preferably used at a blend ratio of at least 30% or more of the warp or weft. Become. More preferably, the bimetallic composite yarn is used for part of the warp and the weft, and more preferably all of the warp and the weft are composed of the bimetallic composite yarn.

In the stretch fabric of the present invention, the bimetallic composite yarn preferably has a single filament fineness of 0.3 dtex or less. When it is 0.3 dtex or less, a soft fabric can be obtained, crimps can be made finer, and downproof properties can be improved. A more preferable single yarn fineness is 0.01 dtex or more and 0.2 dtex or less.

Moreover, in the stretch fabric of the present invention, the total fineness of the bimetallic composite yarn is preferably 40 dtex or less. When the density is 40 dtex or less, a thin fabric can be obtained, which is suitable as a down fabric. A more preferable total fineness is 20 dtex or more and 40 dtex or less.

In the stretch woven fabric of the present invention, a polyester-based or polyamide-based conjugated yarn can be used as the bimetallic conjugated yarn, but a polyester-based bimetallic conjugated yarn is preferable from the viewpoint of excellent stretchability. Furthermore, a bimetallic composite yarn in which one component is polytrimethylene terephthalate or polybutylene terephthalate and the other component is polyethylene terephthalate is preferable because it forms a large number of crimped coils and provides excellent stretchability.

The cross section of the bimetallic composite thread can be arbitrarily selected from round, triangular, flat, hexagonal, L-shaped, T-shaped, W-shaped, eight-lobed, dog-bone, hollow, eccentric core-sheath, etc. can be done.

In the stretch fabric of the present invention, filaments and spun yarns other than the bimetallic composite yarn may be mixed. For example, a bimetallic composite yarn and a false twisted yarn can be arranged in the warp, or a bimetallic composite yarn and a polyurethane covered spun yarn can be arranged in the weft.

In the present invention, there are no restrictions on the texture, density, etc. of the woven fabric, but for example, a plain weave or a ripped weave is preferable in order to obtain high downproof properties. In addition, the present invention includes, but is not limited to, spun, twisted, interwoven, etc., of natural fibers such as rayon, wool, and cotton, and bimetallic composite yarns, as long as the effects are not impaired. .

The stretch fabric of the present invention preferably has a cover factor in the range of 2000 to 3500 in order to obtain excellent downproof properties. Here, the cover factor (CF value) is calculated by the following formula.
・CF value = (DWp/1.1) ^1/2 × MWp + (DWf/1.1) ^1/2 × MWf
DWp is the warp total fineness (dtex), MWp is the warp weaving density (ply/2.54 cm), DWf is the weft total fineness (dtex), and MWf is the weft weaving density (ply/2.54 cm).

In addition, the stretch fabric of the present invention may be coated or laminated as long as the stretchability is not impaired.

The stretch fabric of the present invention as described above can be obtained, for example, by weaving a fabric using a sea-island composite yarn whose island component is a bimetallic composite yarn, and removing the sea component of the sea-island composite yarn in the weaving stage. Obtainable.

In order to weave conventionally used false twisted crimped yarns and normal bimetallic composite yarns that are not sea-island type yarns, entanglement is added in order to suppress the unraveling of the crimps and stabilize the processability. Therefore, it was necessary to suppress crimping. Therefore, there is room for improvement in terms of preventing the down from coming off during elongation. However, in the present invention, a sea-island composite yarn containing a bimetallic composite yarn as an island component is used to form a woven fabric, and then the sea component is removed from the woven fabric to develop crimps in the bimetallic composite yarn. It has become possible to produce fabrics with little entanglement in bimetallic composite yarns.

For example, two types of polyester components having different viscosities (hereinafter referred to as island component polyesters) are used for the bimetallic composite yarn forming the islands of the sea-island composite yarn.

When the island component polyester is composed of the high-viscosity polyester a and the low-viscosity polyester b, the intrinsic viscosity difference Δ[η] between the high-viscosity polyester a and the low-viscosity polyester b is preferably 0.15 or more. If Δ[η] is 0.15 or more, a sufficient difference in shrinkage between the high-viscosity polyester a and the low-viscosity polyester b is developed by the alkali weight reduction corresponding to the sea removal treatment and the subsequent heat treatment, and the winding is performed. It forms a coiled coil, making it easy to obtain excellent extensibility. Δ[η] is more preferably 0.20 or more, more preferably 0.50 or more. The larger Δ[η] is, the better the openability is. For that purpose, the intrinsic viscosity [η] of the low-viscosity polyester b is preferably 0.60 or less.

Further, in order to obtain sufficient openability after the sea removal treatment, the mass composite ratio of the high-viscosity polyester a and the low-viscosity polyester b is preferably 3:7 to 7:3. A more preferred mass compounding ratio is 4:6 to 6:4.

On the other hand, as for the sea component of the sea-island type composite yarn, when the island component is polyester, it should be a polyester that has a sea removal treatment rate (alkali weight loss rate) that is at least 5 times faster than either of the two types of island component polyester. preferable. More preferably, the polyester is 8 times faster, and more preferably 10 times faster. By setting the alkali weight loss rate ratio to 5 times or more for both types of island component polyester, incomplete sea removal (a state in which the sea component is incompletely eluted and the island parts are fused) ) can be easily avoided, and an excellent fabric with few defects such as uneven dyeing and raised unevenness can be easily obtained.

Specifically, any of the known polyesters may be combined as the two island component polyesters. Examples thereof include polyethylene terephthalate (hereinafter referred to as PET), polytrimethylene terephthalate (hereinafter referred to as 3GT), polybutylene terephthalate (hereinafter referred to as PBT), and aliphatic polyesters such as polylactic acid. In these polyesters, a part of the diol component and the acid component each contain a copolymer component capable of forming other ester bonds at a ratio of 20 mol % or less, more preferably 10 mol % or less. good too. Examples of copolymerizable compounds include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, 5-sodium sulfoisophthalic acid, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, Diols such as cyclohexanedimethanol, polyethylene glycol and polypropylene glycol can be mentioned. These polyesters may contain additives such as matting agents, flame retardants, antistatic agents and pigments.

As the sea component polyester, polyethylene terephthalate obtained by copolymerizing 1.5 to 10 mol % of 5-sodium sulfoisophthalic acid component and 2 to 15% by mass of polyethylene glycol is preferable. In addition, since the sea-component polyester forms the fiber surface of the sea-island type composite yarn, it is necessary to have strength to maintain stable process passability. If it is too much, the fiber strength will be lowered. Therefore, the copolymerization amount of 5-sodiumsulfoisophthalic acid is preferably 10 mol % or less, and the copolymerization amount of polyethylene glycol is preferably 15% by mass or less. More preferably, the copolymerization amount of 5-sodium sulfoisophthalic acid is 2 mol % or more and 8 mol % or less, and the copolymerization amount of polyethylene glycol is 4 mass % or more and 12 mass % or less.

The mass ratio of the sea component polyester/island component polyester of the sea-island type composite yarn is preferably 10/90 to 50/50 from the viewpoint of the stability of the composite form, the spinnability, and the productivity. If the mass ratio of the sea component polyester is too low, an abnormality in compounding occurs, resulting in poor division, or even if the dispersion form is normal, poor dissolution of the sea component polyester tends to cause poor division. Conversely, if the mass ratio of the sea-component polyester exceeds 50%, the productivity will decrease. More preferably, the mass ratio of sea component polyester/island component polyester is 20/80 to 30/70.

It is also preferable that the bimetallic composite yarn forming the island portions of the sea-island type composite yarn is a polyamide-based bimetallic composite yarn instead of the above-described polyester-based bimetallic composite yarn. In that case, basically, the conditions may be appropriately set from the same point of view as for the polyester-based bimetallic composite yarn. .

The island component polyamide preferably has an intrinsic viscosity difference Δ[η] between one polymer and the other polymer of 0.03 or more and 0.15 or less. If the intrinsic viscosity difference Δ[η] is less than 0.03, the crimp development effect due to the viscosity difference is small, and if the viscosity difference is greater than 0.15, poor bonding between polyamide polymers and poor spinning occur. , quality problems may occur.

Specifically, the two types of island component polyamides may be combined with any known polyamides. It is preferable to use a polymer, and to use nylon 6, nylon 66, or a copolymer thereof as the low-viscosity polymer.

As the sea-component polyester, the polyester-based bimetallic composite yarn described above can be used.

In producing the sea-island composite yarn as described above, any process can be applied, such as a method in which the spinning and drawing steps are continuously performed, and a method in which the yarn is once wound as an undrawn yarn and then drawn. For example, there is a method of drawing the spun yarn at 600 m/min to 5000 m/min, followed by drawing and heat setting at 3000 m/min to 6000 m/min.

The islands-in-the-sea composite yarn thus produced can be made into a woven fabric using a known weaving method. Any known weave can be applied as the weave, but a plain weave or a lip weave is preferable in order to obtain high down-proof properties.

The loom used for weaving is not particularly limited, and may be a commonly used ordinary loom, a rapier, a water jet loom, an air jet loom, or the like. Among them, an air jet loom, in which excessive tension is not applied to the weft, is a preferred embodiment.

The woven fabric is subjected to a treatment to remove the sea component of the sea-island type composite yarn, thereby causing the bimetallic composite yarn of the island component to develop crimps. As the sea-removal step for developing crimps, it is preferable to subject the woven fabric to alkali weight reduction. As for weight reduction, it is preferable to perform a treatment that completely removes the sea component. For example, the fabric may be immersed in an aqueous sodium hydroxide solution (NaOH: 0.1 to 10 g/L) at 30 to 100°C. As for the alkali weight reduction, basically known methods and apparatuses can be employed, but the sea removal method using a jet dyeing machine is preferable because the sea water can be uniformly removed from the fiber surface.

Further, in order to impart a stronger crimp to the bimetallic composite yarn, it is preferable to apply a heat treatment after the sea removal treatment. Specifically, a stronger crimp can be imparted by imparting a relaxation treatment at 120° C. or higher using a jet dyeing machine.

Furthermore, dyeing processing may be performed after the alkali weight reduction treatment. The dyeing process can be carried out according to the dyeing process and conditions for general fabrics.

The stretch fabric of the present invention obtained as described above uses yarns that are not crimped during weaving, so that the processability is stable, and the yarns that constitute the final stretch fabric exhibit crimps. In addition, since there is substantially no entanglement that causes down to come off, the down proof performance and stretchability are excellent, and air permeability can be stably kept low. Therefore, it is suitably used for down wear, down jackets, futons, sleeping bags, sports clothing, and the like.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples.

(1 ₎ Intrinsic viscosity A value (IV ).
Relative viscosity [η _r ] = η/η ₀ = (t x q)/(t ₀ x q ₀ )
Intrinsic viscosity [IV] = 0.0242 η _r + 0.2634
However, η: viscosity of polymer solution, η ₀ : viscosity of OCP, t: drop time of solution (seconds), q: density of solution (g/cm ³ ), t ₀ : drop time of OCP (seconds), q ₀ : Density of OCP (g/cm ³ ).

(2) Total fineness, single yarn fineness The target yarn is extracted from the woven fabric, and the total fineness is determined by B method of JIS L1013:2010 8.3.1 b). After that, the single yarn fineness is calculated by dividing the fineness by the number of filaments constituting the fineness.

(3) Degree of entanglement A subject yarn is pulled out from the woven fabric, and a length of 1 m is taken under a load of 0.1 g/dtex.

(4) Elongation rate The elongation rate of the woven fabric is measured according to JIS L 1096:2010 8.16 B method.

(5) Air Permeability It was determined by a method based on the air permeability (Frazier method) specified in JIS L 1096:2010 8.26.1.

(6) Down-proof property A 12 cm × 12 cm miniature futon stuffed with 5 g of feathers is prepared using the target fabric (seams are sealed with resin), and this sample is measured according to JIS L1076: 2012 6.1 A method. , into the ICI tester. At that time, one hard rubber ball (4 cm in diameter, 45 g in weight) was tied with a string of 10 cm in length to each of the four central portions of each side forming the circumference of the dough, and thrown into the dough. Three sets of 60 rpm, one hour operation are repeated, and the average number of fallen feathers in each set is determined.

<Example 1>
Two types of island component polymers were PBT (island 1 component) with an intrinsic viscosity of 1.2 and PET (island 2 component) with an intrinsic viscosity of 0.50. Polyethylene terephthalate copolymerized with 10% by mass of polyethylene glycol was separately melted and flowed into a spinneret with 24 islands to form a side-by-side sea-island composite structure. The mass ratio of sea/island 1/island 2 components was 20/40/40. The fiber was wound at a spinning speed of 1500 m/min and drawn at a draw ratio of 2.8 to obtain a sea-island type polyester filament of 42 dtex-12 filament with 24 islands.

Using these yarns for the warp and weft, an air-jet loom was used in a plain weave and woven at a gray fabric density (warp: 154/inch (2.54 cm), weft: 135/inch (2.54 cm)).

Next, the obtained woven fabric is subjected to continuous scouring by spreading at 98°C, and then immersed in a 1% by mass aqueous solution of caustic soda at 90°C for sea removal, thereby developing crimps in the polyester filaments constituting the fabric. rice field. The polyester filaments were 35 dtex-288 filaments (single filament fineness: 0.12 dtex). After that, by applying a liquid flow relaxation treatment at 130° C., crimps were further developed on the surface of the warp and weft. After that, intermediate setting at 180° C., dyeing at 130° C., and finishing setting at 160° C. were performed to obtain a product.

The resulting woven fabric had a working density (warp: 239/inch, weft: 189/inch) and a CF value of 2,414. In addition, the degree of entanglement was 0/m for both warp and weft, the elongation rate was 15% for warp and 25% for weft, the air permeability was 0.8 cc/cm ² /s, and no down was removed in the down proof test. The number was 0. Down garments using this fabric had excellent stretchability and downproof properties, had a very soft texture, and had a smooth and comfortable surface.

< Reference example 1 >
3GT (island 1 component) with an intrinsic viscosity of 1.1 and PET (island 2 component) with an intrinsic viscosity of 0.50 as two types of island component polymers; Polyethylene terephthalate copolymerized with 10% by mass of polyethylene glycol was separately melted and flowed into a spinneret with 24 islands to form a side-by-side sea-island composite structure. The mass ratio of sea/island 1/island 2 components was 20/40/40. The fiber was wound at a spinning speed of 1500 m/min and drawn at a draw ratio of 2.8 to obtain a sea-island type polyester filament of 70 dtex-12 filament with 24 islands.

Using this yarn as the warp and weft, a 2/1 twill structure was woven using an air jet loom at a gray fabric density (warp: 173/inch, weft: 132/inch).

Next, after continuous scouring of the obtained woven fabric at 98° C., it is immersed in a 1 mass % aqueous solution of caustic soda at 90° C. to remove the sea, thereby developing crimps in the polyester filaments constituting the fabric. rice field. The polyester filaments were 56 dtex-288 filaments (single filament fineness: 0.19 dtex). After that, intermediate setting at 180° C., dyeing at 130° C., and finishing setting at 160° C. were performed to obtain a product.

The resulting woven fabric had a working density (warp: 245/inch, weft: 176/inch) and a CF value of 3,004. In addition, the degree of entanglement was 0/m for both warp and weft, the elongation rate was 11% for warp and 18% for weft, the air permeability was 0.5 cc/cm ² /s, and no down was removed in the down proof test. The number was 0. The down garment using this fabric had excellent stretchability and down proofing properties, had a soft texture, and had a smooth and comfortable surface.

< Reference example 2 >
Nylon 6 (island 1 component) with an intrinsic viscosity of 2.6 and nylon 610 (island 2 component) with an intrinsic viscosity of 2.7 as two types of island component polymers, and 5-sodium sulfoisophthalic acid 8.0 as a sea component polymer Polyethylene terephthalate copolymerized with mol % and 10% by mass of polyethylene glycol was separately melted and flowed into a spinneret of 24 islands to form a side-by-side sea-island composite morphology. The mass ratio of the components was 20/40/40, taken up at a spinning speed of 1500 m/min, and drawn at a draw ratio of 2.8 to obtain a sea-island polyamide filament of 42 dtex-12 filament with 24 islands.

Using these yarns for the warp and weft, an air-jet loom was used in a plain weave and woven at a gray fabric density (warp: 154/inch (2.54 cm), weft: 135/inch (2.54 cm)).

Next, after continuous scouring of the obtained woven fabric at 98° C., it is immersed in a 1% by mass aqueous solution of caustic soda at 90° C. to remove the sea, thereby developing crimps in the polyamide filaments constituting the fabric. rice field. The polyamide filaments were 35 dtex-288 filaments (single filament fineness: 0.12 dtex). After that, by applying a liquid flow relaxation treatment at 120° C., further crimps appeared on the surface of the warp and weft. After that, intermediate setting at 170° C., dyeing at 120° C., and finishing setting at 160° C. were applied to obtain a product.

The resulting woven fabric had a working density (warp: 225 threads/inch, weft: 178 threads/inch) and a CF value of 2,384. In addition, the degree of entanglement was 0/m for both warp and weft, the elongation rate was 12% for warp and 20% for weft, the air permeability was 0.9 cc/cm ² /s, and no down was removed in the down proof test. The number was 0. Down garments using this fabric had excellent stretchability and downproof properties, had a very soft texture, and had a smooth and comfortable surface.

<Comparative Example 1>
A drawn yarn of 56 dtex-144 filaments was obtained by spinning PET having an intrinsic viscosity of 0.55 (single filament fineness: 0.39 dtex). Thereafter, using a TFT-6M machine from Aiki Seisakusho, pin false twisting was carried out at 210° C., and interlacing was carried out at a pneumatic pressure of 2 kgf/cm ² (196 kPa) to obtain a false twisted entangled yarn.

Using these yarns as warps and wefts, plain weave fabric was woven using an air jet loom at a greige density (warp: 154/inch, weft: 135/inch).

Next, the obtained woven fabric was subjected to continuous scouring at 98°C, followed by liquid flow relaxation treatment at 130°C, intermediate setting at 180°C, dyeing at 130°C, and finishing setting at 160°C to produce a product.

The resulting woven fabric had a working density (warp: 185 threads/inch, weft: 155 threads/inch) and a CF value of 2,426. The degree of entanglement was warp: 35 threads/m, weft: 32 threads/m, elongation rate was warp: 10%, weft: 12%, and air permeability was 0.9 cc/cm ² /s. . Although the down garment using this fabric has stretchability, 10 pieces of down fell out in the down proof test, and there was a problem that a lot of down fell out from the entangled parts.

<Comparative Example 2>
PET having an intrinsic viscosity of 0.55 as the island component polymer and polyethylene terephthalate obtained by copolymerizing 8.0 mol % of 5-sodium sulfoisophthalic acid and 10% by mass of polyethylene glycol as the sea component polymer were separately melted to form a sea-island composite form. 24 islands were flowed into the nozzle to form. The sea/island component mass ratio was set to 50/50. The fiber was wound at a spinning speed of 1500 m/min and drawn at a draw ratio of 2.8 to obtain a sea-island type polyester filament of 56 dtex-12 filament with 24 islands. Thereafter, the yarn was subjected to pin false twisting at 180° C. using a TFT-6M machine manufactured by Aiki Seisakusho, and subjected to interlacing at an air pressure of 2 kgf/cm 2 to obtain a false twisted entangled yarn.

Using these yarns for the warp and weft, the fabric was woven in a plain weave with an air jet loom at a gray fabric density (warp: 154/inch, weft: 135/inch).

Next, after continuous scouring of the obtained woven fabric at 98 ° C., it is immersed in a 1% by mass 90 ° C. caustic soda aqueous solution to remove the sea, thereby removing the polyester filaments constituting the fabric from 56 dtex-288 filaments ( Single yarn fineness: 0.19 dtex). After that, intermediate setting at 180° C., dyeing at 130° C., and finishing setting at 160° C. were performed to obtain a product.

The resulting woven fabric had a working density (warp: 165/inch, weft: 140/inch) and a CF value of 2,176. In addition, the degree of entanglement was warp: 2 threads/m, weft: 3 threads/m, elongation rate was warp: 1%, weft: 3%, and air permeability was 4.5 cc/cm ² /s. . A down garment using this fabric has a smooth touch, but the stretchability is insufficient, and the down proof test shows that 22 down strands are missing, which is a problem.

Claims (3)

A stretch fabric containing bimetallic composite yarn having a total fineness of 40 dtex or less, a single yarn fineness of 0.01 dtex or more and 0.3 dtex or less, and an entanglement degree of 1 piece/m or less , wherein one component of the bimetallic composite yarn is polybutylene. A stretch fabric comprising terephthalate, the other component being polyethylene terephthalate, having an elongation rate of 10% or more, an air permeability of 1 cc/cm ² /s or less, and a cover factor of 2000 to 3500. A 12 cm x 12 cm miniature futon was prepared from the stretch fabric, and 5 g of feathers were stuffed inside, and a hard rubber ball with a diameter of 4 cm and a weight of 45 g was tied at the center of each side constituting the periphery with a string of 10 cm length. 2. The stretch fabric according to claim 1, wherein the sample is put into an ICI tester and operated at 60 rpm for 1 hour according to JIS L1076:2012 6.1 A method. . A fabric is woven using a sea-island type composite yarn in which one component is polybutylene terephthalate and the other component is polyethylene terephthalate, and the island component is a bimetallic composite yarn . By applying a relaxation treatment at a temperature of ℃ or higher, the bimetallic composite yarn is crimped to impart stretchability to the fabric, and the bimetallic composite yarn in the fabric has a total fineness of 40 dtex or less and a single yarn fineness of A method for producing a stretch woven fabric, characterized in that bimetallic composite yarn having a entanglement degree of 0.01 dtex or more and 0.3 dtex or less and an entanglement degree of 1 piece/m or less is used, and the cover factor of the woven fabric is set within a range of 2000 to 3500.