JPH10292237A - Composite processed yarn and method for producing the same - Google Patents

Abstract

(57) [Summary] [Problem] Composite processed yarn having soft texture, glossiness, firmness, waist, stretchability, etc. and suitable for women's material and coated fabric material having span silky tone stretchability. And a method for producing the same. A composite processing comprising a core yarn composed of a multifilament yarn as a drawn yarn and a sheath yarn composed of a multifilament yarn as an incompletely drawn yarn alternately wound in an S direction or a Z direction and having an interlaced portion. The yarn is characterized in that the yarn has an elasticity recovery ratio of 3 to 20%, the number of residual torque twists is 20 times / m or less, and the shape does not change in both the yarn longitudinal direction and the direction perpendicular to the yarn longitudinal direction. After multi-filament yarn which is a composite processed yarn, an undrawn yarn or an incompletely drawn yarn, and a multi-filament yarn which is a drawn yarn are aligned and subjected to an entanglement treatment, the multi-filament yarn is subjected to a glass transition point temperature or lower. A method for producing a composite processed yarn, comprising performing a temporary twist drawing process of twisting and untwisting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a composite yarn. In more detail, soft texture, gloss and firmness,
The present invention relates to a spun silky composite processed yarn having waist and stretch properties.

[0002]

2. Description of the Related Art Conventionally, two or more kinds of yarns having different elongations are combined, supplied to a feed roller, and subjected to false twisting of twisting, heat setting, and untwisting. The small yarn constitutes a core portion, and the yarn having high elongation is twisted as a sheath so as to surround the outer layer portion of the yarn because it is easy to stretch, and in this state, heat fixing and untwisting are performed. It has been known that a yarn having a low elongation becomes a core yarn, and a composite false twisted yarn in which a yarn having a high elongation is alternately wound around the yarn.

[0003] When the yarn processing speed of the composite false twisted yarn is increased, the composite false twist structure surrounding the alternately twisted shape changes, and each yarn separates.
No. 733, JP-B-61-20662, JP-B-61-52254, etc., two or more kinds of yarns are combined and pre-entangled, and then supplied to a feed roller for false twisting. A method for producing a composite false twisted yarn obtained as described above has been proposed. These composite false twisted yarns have a worsted appearance and feel and have been used as knitted and woven products as outer materials for autumn and winter.

[0004] However, these worsted-tone materials have inherent quality problems such as a twitching feeling and a rough feeling peculiar to the processed yarn, and a loss of glossiness.

Conventionally, as another technique, Japanese Patent Publication No. 7-9
In Japanese Patent No. 1709, a multifilament yarn having a degree of orientation (Δn) of 0.03 or more and a multifilament yarn of 0.02 or less are aligned and entangled, and then a temporary twisting treatment is performed at a temperature lower than the glass transition point to obtain a super soft Methods for producing multifilament yarns have been proposed. However, since the degree of orientation (Δn) of the core yarn is extremely low, there is a problem that the yarn strength is low and the yarn breakage during the process passage or the tear strength of the fabric is low. In addition, although it has a soft spun-like feel, there is a problem that it lacks resilience and glossiness such as firmness and waist and lacks luxury.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the prior art, has soft texture, glossiness, firmness, waist and stretchability, etc. It is an object of the present invention to provide a composite processed yarn suitably used for a coated fabric material and a method for producing the same.

[0007]

The composite yarn of the present invention has the following structure to solve the above-mentioned problems.

[0008] That is, a composite yarn comprising a core yarn consisting of a multifilament yarn which is a drawn yarn and a sheath yarn consisting of a multifilament yarn which is an incompletely drawn yarn alternately wound in the S or Z direction to have an interlaced portion. It is a processed yarn, the elasticity recovery ratio is 3 to 20%, the residual torque twist number is 20 times / m or less, and the shape does not change in any of the yarn longitudinal direction and the direction perpendicular to the yarn longitudinal direction. It is a composite yarn that is characterized.

Further, the method for producing a composite textured yarn according to the present invention comprises:
The following structure is provided to solve the above-mentioned problem.

That is, a multifilament yarn which is an undrawn yarn or an incompletely drawn yarn and a multifilament yarn which is a drawn yarn are aligned and entangled, and then heated at a temperature lower than the glass transition temperature of the multifilament yarn. This is a method for producing a composite processed yarn, which comprises performing a temporary twist drawing process of twisting and untwisting.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a yarn morphology model of the spun silky composite textured yarn of the present invention. The core yarn (a) covered with the sheath yarn and almost invisible from the outside is the sheath yarn (b)
It is wound in an alternately twisted shape in the direction (c) or the Z direction (d), the reversal portion (e) has a non-twisted shape, and the strong entangled portion (f) has a yarn structure showing a focused state.

In the present invention, a drawn yarn is used as the core yarn. As the core yarn, a multifilament yarn having a low sagging can be used, and a processed yarn having a low sagging having a very small torque can be used. An incompletely drawn yarn is used as the sheath yarn. As such a sheath yarn, a low-shrink processed yarn having very little torque or snare unique to false twist yarn can be used.

[0013] The composite processed yarn of the present invention is obtained by winding the sheath yarn around the core yarn in an alternately twisted shape in the S direction or the Z direction. Having a confounding part.

The composite yarn of the present invention has an expansion / contraction restoration ratio of 3 to 2.
It is in the range of 0%, and is characterized in that almost no shrinkage due to snare, torque or loop, which occurs in normal false twisting, appears.

The magnitude of the elasticity restoration rate greatly affects the texture such as bulkiness, swelling or stretchability, but if it is less than 3%, there is a problem that the bulkiness, swelling or stretchability is almost lost. %, On the contrary, the bulkiness, the swelling feeling or the stretchability is too high, and there is a problem that the feeling of the swelling and the feeling of swelling is obtained. In ordinary men's and women's clothing, some stretchability is functionally required, and the elasticity restoration ratio is set in the range of 3% to 20%.

The number of residual torque twists is 0 to 20 times / m. The number of residual torque twists of a normal composite temporary twisted yarn is 30.
The number is about 150 times / m, but the number of the composite textured yarn of the present invention is extremely small because there is no temporary twisted snare or loop as described above. 2 residual torque twists
If it exceeds 0 times / m, the expansion / contraction restoration rate increases and the bulkiness, swelling feeling or stretchability gradually increases, and there is a problem in that a feeling of swelling and a feeling of flapping occurs.

Further, the feature of the composite textured yarn of the present invention is that there is no change in the cross-sectional shape and side surface trace of the multifilament yarn used. This is thought to be caused by the temporary twist stretching process, which temporarily causes the deformation, but this deformation is restored by the temporary twist re-heat treatment in the subsequent step or the dyeing relaxation heat treatment after forming the fabric. As a result, the characteristics of the luster and the cross-sectional shape or the side shape of the filament yarn, which is the original yarn, are not lost, and a high-quality feel and gloss of appearance can be obtained. For example, when a normal yarn is subjected to a normal twisting process on a base yarn having a round cross-sectional shape, the cross-section changes to a hexagonal cross-section, and traces of a change from a round shape to a shape having corners are observed on the side surfaces.
However, in the present invention, it is considered that no trace of shape change is given to restore the shape of the original yarn.

In the present invention, it is important that there is no expansion / contraction restoration ratio in a specific range, residual torque in a specific range and no trace of yarn shape change.

In the present invention, from the viewpoint of greatly improving the stretchability and the texture such as firmness and waist, particularly the drapability, and improving the tailoring appearance, eliminating the loss of shape and improving the comfortable feeling when worn. It is also preferable to use a latent silk yarn for the core yarn.

The structure of the latent sagged yarn used for the core yarn may be any type such as a core / sheath type, an unevenly distributed core / sheath type, a slit type, and a bimetal type. Is only required to have a characteristic that makes it apparent.

The latent saponified yarn may be a composite elastic fiber containing a polyurethane elastic fiber or a polyester elastomer or a polybutylene terephthalate fiber alone.

These are preferred methods because a slight shrinkage expression effectively acts to improve the entanglement with the sheath thread.

In the present invention, it is also preferable to use a thick and thin multifilament yarn for the core yarn and the sheath yarn. In particular, the use of thick and thin sheath yarns produces thick and light colored polished surface effects and coarse density in the wrapped shape. Can be obtained.

In the present invention, it is also preferable to use a multi-filament yarn having a modified cross section as the incompletely drawn sheath yarn. For example, in the hollow cross-sectional shape, since the heat treatment is performed at a temperature equal to or lower than the glass transition point, the hollow cross-sectional shape does not collapse, so the weight is substantially reduced by the hollow, and the heat retention is high by holding air in the hollow part. It is considered to be.

In addition, triangle, square, pentagon, octagon, field type,
Any cross-sectional shape such as flat, elliptical, U-shaped, and H-shaped can make use of the original yarn characteristics.

Next, a method for producing a composite textured yarn of the present invention will be described.

According to the present invention, a multifilament yarn, which is an undrawn yarn or an incompletely drawn yarn, and a multifilament yarn, which is a drawn yarn, are aligned and entangled, and then subjected to a glass transition temperature of the multifilament yarn. In this method, a temporary twist stretching process of twisting and untwisting is performed.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a schematic view showing an example of the steps of the method for producing a composite textured yarn of the present invention. A filament yarn (1) composed of an undrawn yarn or a semi-drawn yarn and a filament yarn (2) composed of a drawn yarn are respectively aligned and supplied to a feed roller (3), and a entanglement nozzle (4) is formed between the filament yarn (1) and the feed roller (5).
To perform confounding processing. The entangled filament yarn is subjected to a twist-twisting temporary twist drawing process, and the heat treatment during twisting is performed at a temperature equal to or lower than the glass transition temperature of the filament yarn (1). In the present invention, the heat treatment during twisting is preferably performed at room temperature or higher. For example, the range of 25 to 85 [deg.] C. is preferable for polyester yarns. If the set temperature cannot be set low due to the heater equipment, the heater may be used with a reduced length. As described above, the heater (6) may be used, but if the room temperature is controlled, there is no need to provide a heater. Therefore, it is preferable that the treatment is performed at a temperature closer to the glass transition temperature, since the quality may be affected in some cases.

Twist is applied by a false twist twister (7),
After untwisting, it is pulled out from the delivery roller (8) and wound up on the cheese (11) by a winding roller. In the present invention, twisting and untwisting are performed for the purpose of stretching.

When the latent yarn is used in place of the drawn yarn, the expression of the stretch property can be achieved by performing a relaxing heat treatment with a heater (9) between the relaxing roller (10) and the delivery roller (8). Can be.

As a result, it is possible to obtain a composite textured yarn having both soft texture and stretchability. The filament yarn (1) used in the present invention is mainly composed of polyester, but may be polyamide yarn, and may be any of undrawn yarn, semi-drawn yarn, and thick and thin yarn obtained by a usual spinning method. .

The semi-drawn yarn referred to in the present invention is a yarn obtained by a usual spin drawing method, and is a high-speed spinning yarn of a polyester yarn which is drawn at a spinning speed of 2500 to 3500 m / min to 5000 to 7000 m / min. Refers to a thread that has been made Further, the undrawn yarn is a yarn in which the molecular chains are hardly oriented in the yarn before being drawn, and the drawing is not sufficiently advanced with the semi-drawn yarn, and the orientation of the molecular chains is insufficient. Refers to yarn.

For example, a semi-drawn polyester filament yarn has a birefringence Δn of 120 × 10 ⁻³ or less, and an undrawn yarn has a range of 20 × 10 ⁻³ or less.

The total fineness of the filament yarn (1) is 50 to 3
A range of 00 denier is preferred. The fineness of the single fiber is preferably 3d or less, and it is more preferable to use a fine denier of 1d or less, since a soft-textured composite yarn can be obtained. It is more preferable to use one having a thickness of 0.1 d or less, since a texture such as slimy feeling and firm feeling can be obtained.

As described above, since the cross-sectional shape is not subjected to the mechanical deformation due to the temporary twist drawing, the glossy state of the original yarn before the temporary twist processing can be restored.

The filament yarn (2) used in the present invention is:
Although a normal drawn yarn can be used, a composite yarn formed by using a high shrinkage yarn or a latent crimped yarn is also preferable. In particular, the structure of the latent crimped yarn may be any structure such as a bimetal type, a core / sheath type, or an eccentric type, an uneven distribution type, a dispersion type, a split type, and a peeling type.

The entanglement process is performed between the feed roller (3) and the feed roller (5). The overfeed rate is preferably +1 to + 5%. Excess supply rate is +1
If it is less than 5%, the winding type of the sheath yarn is less likely to have a core-sheath structure, and if it exceeds + 5%, the yarn amount of the core and the sheath becomes too large. Tend.

The heat treatment is carried out at a temperature lower than the glass transition point of the sheath yarn. However, the higher the temperature set is above room temperature, the more stable the yarn workability is.

The temporary twist drawing may be performed by any method such as a spindle type, a belt type, and a friction type. However, the belt type and the friction type are preferred because they are excellent in thread processing and high speed. It is.

The number of twists is preferably in the range of the ordinary number of temporary twists. For example, with a total of 150 deniers of 75 deniers / 75 deniers, a twist number of 2000 to 3000 T / m can be obtained. This is preferable because a composite textured yarn having the following texture can be obtained.

In the present invention, the composite yarn of the present invention drawn from the delivery roller (8) is heat-treated by the heater (9) or directly from the delivery roller (8) to the cheese (11) by the winding roller. You may wind up. When the heat treatment is performed by the heater (9), when the heat treatment is performed while relaxing, the filament yarn of the core yarn is slightly shrunk, so that the stretchability is slightly imparted and the bulky composite processed yarn can be obtained. On the other hand, when heat treatment is performed while tension is applied, on the other hand, the development of shrinkage of the core yarn is suppressed, and the shrinkage of the sheath yarn is slightly extended, so that a glossy composite processed yarn can be obtained. However, the stretch property is suppressed on the contrary.

The heat treatment conditions may be appropriately selected according to the purpose of use, but the temperature range is preferably not lower than the glass transition temperature and not higher than the melting point. The post-remaining process passability is improved and preferable. Conversely, when the temperature is high and the overfeed rate is set too low, the shrinkage tends to disappear and the shrinkage rate is low and the drape property is improved, which is preferable.

[0043]

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

Example 1 Assuming that latent latent crimped yarn was used as the core yarn, 85 denier of polyester filament yarn was used as the incompletely drawn yarn (1) (POY at a spinning speed of 3000 m / min) in the process of FIG. Using 48 filaments (bright, round cross section) and polyester filament 75 denier 12 filaments (bright, round cross section) as latent sacrificed yarn (2), a entanglement pressure of 4 kg / cm ² ,
After entanglement of both yarns at the entanglement overfeed rate of + 2%, the twister rotation speed is 4150 rpm with a heater at a heat treatment temperature of 85 ° C.
m, Twisted urethane 12 sheets and 4 metal sheets were subjected to a temporary twisting process in the S direction, and 30 pieces were delivered by a delivery roller.
It was picked up at 0 m / min and rolled up into cheese.

As a result, a glossy soft composite processed yarn having an elasticity recovery ratio of 15.5% and a residual torque twist of 7 turns / m was obtained.

Further, the number of additional twists is 1500 in the twisting direction of the false twist.
T / m twisted, 75 ° C ×
A 60 minute wet heat setting was performed. The obtained yarn was used as a weft, and a plain weave fabric was woven using a normal polyester filament (round section, bright, 75 denier 36 filament) as the warp. Then, soda ash 2g / l
60 ° C × 30 minutes scouring, 98 ° C × 60 minutes relaxed hot water treatment, dry heat 160 ° C × 90 seconds Relaxed hot water treatment After the intermediate set, both the width and length are 5% strained. At 98 ° C. × 4 using NaOH (30 g / l).
After a 0-minute weight reduction process (weight reduction rate: 24%), the intermediate set was subjected to a width-long and length-end finishing set at 170 ° C. for 90 seconds to produce a woven fabric.

From the obtained woven fabric, a high-quality spun silky new synthetic fiber woven fabric excellent in gloss, stretchability, soft texture, drapability, color development and the like was obtained.

Example 2 In the case where a drawn yarn having a high shrinkage rate was used as the core yarn, an incompletely drawn yarn (1) (POY having a single fiber filament denier of 0.5 denier) was used in the step of FIG. Using 115 denier 136 filament (bright, round cross section) of polyester filament yarn and 75 filament 36 denier filament of polyester filament (21% shrinkage in boiling water) as the drawn yarn (2), entanglement pressure 4 kg / cm ² , entanglement After the two yarns are entangled at an overfeed rate of + 2%, a temporary twisting process in the S direction is performed with a twister rotation speed of 4150 rpm by a heater having a heat treatment temperature of 85 ° C. and 12 twister urethanes and four metals, and a delivery roller at 300 m / min. Picked up and rolled it up into cheese.

As a result, a glossy soft composite yarn having an elasticity recovery ratio of 6.7% and a residual torque twist of 8 turns / m was obtained.

Further, the number of additional twists is 1200 in the twisting direction of the false twist.
T / m twisted, 75 ° C ×
A 60 minute wet heat setting was performed. Example 1
The same woven fabric was produced. The resulting woven fabric was a high-quality spun silky tone new synthetic fiber woven fabric having excellent gloss, warp-like texture, soft cellulose-like texture, drape property, and coloring property.

Example 3 Assuming that a hollow cross-section yarn is used as the sheath yarn, in the step of FIG. 2, 85 denier of a polyester filament yarn is used as the incompletely drawn yarn (1) (POY at a spinning speed of 3000 m / min). 36 filaments (bright, hollow cross section, hollow ratio 20%) and latent silk yarn (2)
Polyester filament yarn 75 denier 12 filaments (bright, round cross section), entangled both yarns at an entangling treatment pressure of 4 kg / cm ² and an entangling overfeed rate of + 2%, and then twisted with a heater at a heat treatment temperature of 85 ° C. Number 4150rpm, Twister configuration 12 urethane
Temporary twisting in the S direction was performed with four pieces of metal, the piece was taken up by a delivery roller at 300 m / min, and wound up into cheese.

As a result, a soft multifilament yarn having an expansion / contraction restoration rate of 13.1%, a residual torque twist of 6 turns / m, and a hollow rate of 18% in which the hollow shape of the sheath yarn cross section was hardly crushed was obtained.

A woven fabric was produced from the obtained yarn in the same manner as in Example 1. The obtained woven fabric provided a high-quality spun silky tone new synthetic fabric having glossiness, stretchability, soft texture, drape and lightness.

Example 4 In the case where thick and thin yarn is used as the core yarn, 75 denier 36 of polyester filament yarn is used as the incompletely drawn yarn (1) (thick and thin) in the process shown in FIG. A filament (bright, round section) and a polyester filament 75 denier 12 filament (bright, round section) were used as the latent silk yarn (2) at a confounding treatment pressure of 4 kg / cm ^{2 and a} confounding overfeed rate of + 2%. After entanglement of the yarn, twister rotation speed 4150 rpm with a heater at a heat treatment temperature of 85 ° C
m, S by twister configuration 12 urethane and 4 metal
Direction temporary twisting process, 300
m / min and rolled up into cheese.

As a result, the expansion / contraction restoration ratio was 11.2%, the number of residual torque twists was 6 times / m, and the wool of the yarn unevenness was 7.1%.
Was obtained.

Further, the number of additional twists is 1500 in the twisting direction of false twist.
T / m twisted, 75 ° C ×
A 60 minute wet heat setting was performed. Example 1
A woven fabric was produced in the same manner as described above. The obtained woven fabric was a new synthetic fiber woven fabric having a heather feeling, a stretch property, a dry texture, a soft texture, a drape property, a soft feel, an excellent sense of unevenness and a relatively dry feel.

Example 5 In the case where re-heat treatment was performed, in a process using the heater (9) shown in FIG. 2, a polyester filament yarn was used as an incompletely drawn yarn (1) (POY at a spinning speed of 3000 m / min). Using an 85 denier 48 filament (bright, round cross section) and a polyester filament 75 denier 12 filament (bright, round cross section) as the latent sagging yarn (2), the entanglement pressure was 4
After entanglement of both yarns at kg / cm ² and entanglement overfeed rate of + 2%, temporary twisting in the S direction was performed with a twister rotation speed of 4150 rpm by a heater having a heat treatment temperature of 85 ° C. and 12 twister-structured urethanes and 4 metals. Then, it was picked up by a delivery roller at 300 m / min, reheat-treated at 140 ° C. at an overfeed rate of + 5%, and rolled up into cheese.

As a result, a glossy soft composite processed yarn having an expansion / contraction restoration rate of 7.8% and a residual torque twist of 2 turns / m was obtained.

Further, the number of additional twists is 1500 in the twisting direction of false twist.
T / m twisted, 75 ° C ×
A 60 minute wet heat setting was performed. Example 1
The same woven fabric was produced. The resulting woven fabric was a high-quality silky tone new synthetic fiber woven fabric having excellent gloss, firmness, waist, soft slimy texture, drapability and coloring.

Comparative Example 1 JP-B-61-19733, JP-B-61-20662, and JP-B-61-52
No. 254, etc., two or more yarns were combined and pre-entangled, fed to a feed roller, and false-twisted to produce a false twisted composite yarn. In the process shown in FIG. 2, 85 denier 48 filament (bright, round section) of polyester filament yarn as incompletely drawn yarn (1) (POY at a spinning speed of 3000 m / min) and polyester filament as drawn yarn (2) After entanglement of both yarns at an entangling treatment pressure of 4 kg / cm ² and an entangling overfeed rate of + 2% using 75 denier yarn 12 filaments (shrinkage ratio in boiling water: 21%), twisting is performed with a heater at a heat treatment temperature of 170 ° C. Number 4150 rp
m, S by twister configuration 12 urethane and 4 metal
Ordinary temporary twisting processing was performed in the direction, and the wound cheese was wound up at 300 m / min by a delivery roller.

As a result, a composite processed yarn having an expansion / contraction restoration rate of 41.5%, a residual torque twist of 88 turns / m, and a shrinkage in boiling water of 11% was obtained.

Further, the number of twists in the twisting direction of the false twist is 1500.
T / m twisted, 85 ° C ×
A 60 minute wet heat setting was performed. The obtained yarn was used as a weft, and a plain weave fabric was woven using a normal polyester filament (round section, bright, 75 denier 36 filament) as the warp. Then, soda ash 2g / l
At 60 ° C. × 30 min., Relaxed hot water treatment at 98 ° C. × 60 min, intermediate set of dry heat 160 ° C. × 90 seconds, 5% tension, 98 ° C. × 60 using NaOH (30 g / l). 1 minute (weight loss rate 22%)
At 70 ° C. for 90 seconds, the intermediate set was subjected to a finishing set by processing with a width and a length, and a woven fabric was produced.

Although the obtained woven fabric did not have a glossiness and was excellent in stretchability, a soft and high-quality woven fabric having a crisp texture and a slightly crisp feeling could not be obtained.

[0064]

According to the present invention, it is possible to obtain a soft-textured fabric having no stretchiness, a slight stretch property and a high drape property.

In addition, silky gloss can be exhibited, and a material excellent in lightness and heat retention can be obtained.

Further, in the present invention, since there are very few torques and snares, and it has a slight stretchability, it has good passability in post-processes such as linen yarn, warping, and weaving.

In addition, as a use, general women's knitted fabric material,
Suitable for new synthetic fabric materials with stretch properties, such as knitted fabrics for medium-thick fabrics, casual jackets, etc.

In addition, it is possible to obtain a knitted fabric having excellent coloring properties.

[Brief description of the drawings]

FIG. 1 is a schematic external view schematically showing an example of a composite textured yarn of the present invention.

FIG. 2 is a schematic process diagram schematically illustrating an example of a method for producing a composite textured yarn of the present invention.

[Explanation of symbols]

 1: Multi-filament yarn composed of half-drawn yarn 2: Multi-filament yarn composed of fully-drawn yarn 3: Feed roller 4: Entangling nozzle 5: Feed roller 6: Heater 7: Temporary twister 8: Delivery roller 9: Heater 10: Relax roller 11: Winding Taking cheese

Claims (8)

[Claims] 1. A composite comprising a core yarn comprising a multifilament yarn which is a drawn yarn and a sheath yarn comprising a multifilament yarn which is an incompletely drawn yarn alternately wound in an S direction or a Z direction, and having an entangled portion. It is a processed yarn, the elasticity recovery ratio is 3 to 20%, the residual torque twist number is 20 times / m or less, and the shape does not change in any of the yarn longitudinal direction and the direction perpendicular to the yarn longitudinal direction. Characterized composite processed yarn. 2. The composite yarn according to claim 1, wherein the core yarn and the sheath yarn are multifilament yarns made of polyethylene terephthalate. 3. The composite yarn according to claim 1, wherein the core yarn has latent shrinkability. 4. The composite yarn according to claim 1, wherein the core yarn or the sheath yarn is a thick and thin yarn. 5. The composite yarn according to claim 1, wherein the sheath yarn is a modified cross-section yarn. 6. A multifilament yarn which is an undrawn yarn or an incompletely drawn yarn and a multifilament yarn which is a drawn yarn are aligned and entangled, and then heated at a temperature not higher than the glass transition temperature of the multifilament yarn. A method for producing a composite textured yarn, which comprises performing a temporary twist drawing process of twisting and untwisting. 7. The method according to claim 6, wherein the multifilament yarn is made of polyethylene terephthalate. 8. The multi-filament yarn according to claim 6, wherein the multi-filament yarn is heat-treated at a temperature equal to or higher than the glass transition point and equal to or lower than the melting point temperature after the preliminary twist drawing and twisting. Manufacturing method.