JP2001355136A - Multicolored composite textured yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multicolored grain-like composite false-twist textured yarn excellent in soft feeling and resilience. SOLUTION: This composite false-twist textured yarn is obtained by applying false twisting to yarn having core-sheath conjugate filament yarn (A) consisting of a polymer (Aa), composed substantially of polyester, arranged in a sheath part and a polymer (Ab), whose temperature dependence of elongation viscosity is larger than that of the above polymer (Aa), arranged in a core part. The false-twist textured yarn is characterized by continuously possessing irregular thick part and thin part in both of the above filament yarns (A) and (B) in longitudinal direction of yarn length and partially possessing hollow parts in the polymer (Ab) arranged in the core part of the above core-sheath conjugate filament yarn (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention forms a fabric which has an unprecedented multicolor heather surface change, is excellent in softness and resilience, and is also excellent in wearing comfort such as lightness and heat retention. TECHNICAL FIELD The present invention relates to a composite temporary twisted yarn suitable for use and a method for producing the same.

[0002]

2. Description of the Related Art There have heretofore been proposed several composite false-twisted yarns in which two kinds of filaments are compounded to obtain a difference in light and shade dyeing by a difference in dyeing effect in the length direction of the yarn and a method for producing the same.

For example, Japanese Patent Publication No. 55-45653 proposes a method of producing a special marbled yarn by giving an irregular undrawn portion to any one of two types of filaments and subjecting the filament to temporary twisting. I have. But,
It has been pointed out that there are manufacturing problems such as a short change in the length of the density difference of the filament, a monotonous pattern, insufficient contrast, and partial fusion at the undrawn portion.

Japanese Patent Application Laid-Open No. 07-324237 proposes a marbled polyester composite yarn which is obtained by fluidly entanglement of a cationic dyeable thick and thin yarn and a filament yarn and which is easy to separate. However, the change in the length of the color difference is short, and the pattern is still monotonous, and the number of colors is limited.

Further, Japanese Patent Publication No. Sho 62-031094 proposes a heat-treated composite yarn in which undrawn yarns of different filaments are aligned, subjected to a thick and thin process, and then subjected to a temporary twisting process. . This method certainly produces a processed yarn with a strong contrast of shading, but because there are many undrawn parts, when knitted and woven, the texture becomes hard and lacks softness. there were.

[0006] In recent years, the demand for polyester fabrics has been further enhanced, and in addition to the above-mentioned feeling, wearing comfort such as lightness and heat retention is also required as basic performance. However, in the above-mentioned prior art, these wearing comforts are no longer at a satisfactory level.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. By providing a hollow portion in a yarn having large and thin spots, various kinds of surface changes can be achieved. An object of the present invention is to provide a composite false twisted yarn for knitted and woven fabrics having excellent softness and resilience, and a method for producing the same.

[0008]

Means for Solving the Problems The composite false twisted yarn of the present invention and the method for producing the same employ the following constitution. That is, (1) a polymer (Aa), which is substantially a polyester, is disposed in a sheath portion, and the temperature dependence of the elongational viscosity is such that the polymer (Aa)
a) a core-sheath composite filament yarn (A) in which a polymer (Ab) larger than that of (a) is disposed in the core portion, and a filament yarn (B) substantially composed of polyester;
A composite false twisted yarn subjected to false twisting, wherein the filament yarns (A) and (B) both have irregularly thick portions and details continuously in the yarn longitudinal direction, and the core A composite false twisting yarn, wherein the polymer (Ab) disposed in the core of the sheath composite filament yarn (A) has a hollow portion partially.

(2) The core-sheath composite filament yarn (A)
And the filament yarn (B) has a yarn length difference of 1 to 10%.

(3) The composite false twisted yarn according to (1) or (2), wherein the yarn spot variation rate U% is 4 to 15%.

(4) The core-sheath composite filament yarn (A)
The composite false twisted yarn according to any one of the above (1) to (3), wherein a hollow portion formed in the yarn exists only in a detail in a yarn longitudinal direction.

(5) The core-sheath composite filament yarn (A)
The composite false twisted yarn according to any one of the above (1) to (4), wherein the core polymer (Ab) is a polystyrene-based polymer.

(6) A core in which a polymer (Aa), which is substantially a polyester, is disposed in a sheath portion, and a polymer (Ab) having a temperature dependence of elongational viscosity greater than that of the polymer (Aa) is disposed in a core portion. A yarn having a sheath composite filament yarn (A) and a filament yarn (B) substantially made of polyester is naturally drawn to the lower of the core-sheath composite filament yarn (A) and the filament yarn (B). A method for producing a composite false-twisted yarn, comprising drawing the yarn at a draw ratio or less and then performing a false twisting process.

(7) The core-sheath composite filament yarn (A)
(6) The method for producing a composite false-twisted yarn according to the above (6), wherein the yarn is stretched at a temperature not higher than the glass transition temperature of the core polymer (Ab).

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The composite false twisted yarn of the present invention has a polymer (Aa), which is substantially a polyester, disposed in a sheath, and the elongational viscosity has a higher temperature dependency than that of the polymer (Aa). A composite false twisted yarn obtained by subjecting a core-sheath composite filament yarn (A) having a large polymer (Ab) to the core thereof to a filament yarn (B) substantially made of polyester, and performing a false twisting process. Characterized in that the polymer (Ab) disposed on the core of the core-sheath composite filament has a hollow portion partially, having irregularly thick portions and details continuously in the longitudinal direction of the yarn. Things.

In the method for producing a composite false twisted yarn of the present invention, the polymer (Aa), which is substantially a polyester, is disposed in the sheath, and the temperature dependency of the elongational viscosity is higher than that of the polymer (Aa). A yarn having a core-sheath composite filament yarn (A) in which a large polymer (Ab) is disposed in a core portion, and a filament yarn (B) substantially made of polyester are combined with the core-sheath composite filament yarn (A). Filament yarn (B)
And then performing a false twisting process after stretching at a lower natural stretching ratio.

Hereinafter, the present invention will be described in detail, but the present invention is not limited to the embodiments and the like. The evaluation in the examples was performed by the following method. (1) Evaluation of softness The softness of the woven fabrics obtained by the methods described in Examples and Comparative Examples was sensory-evaluated by touch. At this time, the woven fabric of Comparative Example 2 was used as a standard, and a five-step evaluation was performed according to the following criteria, and the evaluation results of ten panelists were averaged and judged.

5: Extremely soft texture 3: Texture equivalent to standard fabric 1: Extremely hard texture (2) Evaluation of resilience Sensory evaluation of the resilience of the fabrics obtained by the methods described in Examples and Comparative Examples by touch. did. At this time, the woven fabric of Comparative Example 2 was used as a standard, and a five-step evaluation was performed according to the following criteria, and the evaluation results of ten panelists were averaged and judged.

5: Extremely high resilience 3: Resilience equivalent to that of standard fabric 1: Extremely low resilience (3) Evaluation of heat treatment (3) Evaluation of heat treatment of the fabric obtained by the method described in Examples and Comparative Examples. The color difference was visually evaluated. At this time, the woven fabric of Comparative Example 2 was used as a standard, and a five-step evaluation was performed according to the following criteria, and the evaluation results of ten panelists were averaged and judged.

5: Extremely large difference in heather color mixing 3: 3: Same heather color difference as standard fabric 1: Very small heather color difference FIG. 1 shows the cross-sectional shape of filament yarns (A) and (B) according to the present invention. It is a cross section showing an example. In the present invention, as shown in FIG. 1, a polymer (Aa) 2 which is substantially a polyester is disposed in a sheath portion, and a polymer (Aa) having a temperature dependence of elongational viscosity larger than that of the polymer (Aa).
b) Core-sheath composite filament yarn (A) 1 having 3 disposed on the core
And a filament yarn (B) 4 substantially made of polyester, which has been subjected to false twisting, and has a continuous irregular thick portion and detail in the yarn longitudinal direction, and a core-sheath composite. It is characterized in that the polymer (Ab) 3 disposed on the core of the filament is partially cut to have a hollow portion.

Conventionally, the difference in shading of a woven or knitted fabric is caused by a difference in dye adsorption between an unstretched portion (thick portion) and a stretched portion (detail).
The unstretched portion has a weak molecular orientation and is thick and absorbs the dye well, but the stretched portion has a fine molecular orientation and is thin and has a weak power of absorbing the dye. Due to this property, a shade difference in hue occurs.

FIG. 2 is a schematic view showing an example of the side shape of the processed yarn. When each of the core-sheath composite filament yarn (A) 1 and the filament (B) 4 substantially composed of polyester has irregular thick and thin spots in the undrawn portion (thick portion) 5 and the drawn portion (detail) 4, When these are stained, each of (A) and (B) has an irregular shade. Since each of (A) and (B) has two colors, dark and light, the composite false-twisted yarn obtained by blending them has a fine shade of 2 colors x 2 colors. Become.

In the composite false twisted yarn of the present invention, in addition to the shading, the polymer (Ab) disposed on the core of the core-sheath composite filament yarn (A) 1 is cut to partially form the hollow portion 7. By having, the hollow portion 7 shows a lighter color. In other words, this has a more detailed light and dark spot of 2 × 3 colors. The presence of the hollow portion 7 not only in the color difference but also in the glossy surface gives a calm silk-like luster. This is considered to be due to the difference in refractive index and light reflection.

[0024] In addition, even with respect to the texture, which is a problem with the conventional thick and thin mottled yarn, the hollow portion 7 of the composite false twisted yarn of the present invention is present in a state in which the filament yarn (A) has a different phase from each other. It will be good. A normal thick and thin mottled yarn is inferior in soft feeling because an undrawn portion exists. Even in the same hollow portion, the hollow portion connected on the filament axis has a soft but not repulsive feeling. As shown in FIG. 2, the hollow portions 7 are intermittently present on the filament axis, and their phases are different for each filament, so that a soft and coreless repulsive feeling is exhibited. .

In addition, the presence of the hollow portion provides characteristics that are superior in wearing comfort, such as light weight and heat retention, as compared with the conventional thick and thin plaques.

When false-twisting the core-sheath composite filament yarn (A) and the filament yarn (B), the difference in yarn length is 1 to 1
0% is preferable in terms of swelling and resilience.
If the yarn length difference is less than 1% in the woven or knitted fabric, not only the swelling feeling is lost but also the resilience due to the filament (A) is lost when making the woven or knitted fabric. If the yarn length difference exceeds 10%, the woven or knitted fabric is undesirably fuzzy. The yarn length difference is longer for the filament yarn (A) than for the filament yarn (B).

More preferably, the yarn unevenness variation rate U% is 4
１５15%. If the yarn unevenness variation rate is expressed as U%, a preferable surface effect can be obtained in the range of 4% to 15%. If U% is less than 4%, the variation rate of yarn unevenness becomes small and inconspicuous, and if it exceeds 15%, the processability of knitted fabric production decreases, so that it is not preferable in this range. In addition, the measurement method of the yarn unevenness variation rate U% was measured at a yarn speed of 25 m / min using an EVENESSTESTER80 TYPE80 manufactured by Keisoku Kogyo Co., Ltd.

More preferably, the hollow portion formed in the core-sheath composite filament yarn (A) exists only in details in the longitudinal direction of the yarn. It is more effective that the hollow portion exists in the details than the thick portion from the viewpoint of softness and resilience.

The polyester used as the polymer (Aa) disposed on the sheath portion of the core-sheath composite filament yarn refers to a polymer having an ester bond, and polyethylene terephthalate (PET) is the most general and preferred.
In addition, the diol component and a part of the acid component are each 15 mol.
It may be substituted with another copolymerizable component within the range of 1% or less. They may also contain additives such as other polymers, matting agents, flame retardants, antistatic agents, pigments and the like. As the polymer (Ab) disposed on the core, it is important to use a polymer whose temperature dependence of elongational viscosity is larger than that of the polymer (Aa). This can be selected by the method described in JP-A-8-246247. When PET is used as the polymer (Aa), the polymer (Ab) can be a polystyrene-based polymer, a polyacrylate-based polymer, or methylpentene. And the like. From the viewpoint of cost and spinnability, polystyrene polymers are most preferred.

The higher the viscosity of the polymer (Ab) is, the higher the contribution of the hollow portion due to the partial cutting of the polymer (Ab) becomes, and the softness, resilience, lightness and heat retention can be improved. The polymer (Ab) is disclosed in
As described in Japanese Patent No. 246247, there is also an advantage that the productivity can be improved by the effect of suppressing the orientation, and from this viewpoint, it is preferable that the viscosity of the polymer (Ab) is high. In the case of polystyrene, the melt flow rate (MFR,
The smaller the value, the higher the viscosity) is preferably 3.0 or less, more preferably 1.5 or less.

It is important that the polymer (Ab) is disposed at the core of the core-sheath composite filament yarn and is not exposed on the fiber surface. When the polymer (Ab) is exposed on the fiber surface, troubles such as fusing at the time of drawing or yarn processing and dullness when fabric and dyed after fabricating occur. In addition, when the polymer (Ab) is not a core-sheath composite filament yarn but a polymer blend, not only the same trouble occurs, but also a decrease in the spinning property due to blend unevenness and unevenness in physical properties are likely to occur. The form of the core-sheath composite may be concentric or eccentric, but concentric circles are preferred in view of composite stability.

If the composite ratio of the polymer (Ab) disposed in the core to the whole core-sheath composite filament yarn is 1% by weight or more, the contribution of the hollow portion due to partial cutting of the polymer (Ab) described later increases, The feeling, resilience, lightness and heat retention can be improved, which is preferable. In addition, the composite ratio is preferably 1% by weight or more from the viewpoint of improving the effect of suppressing the orientation of the polymer (Ab). However, if the composite ratio of the polymer (Ab) is excessively high, the spinning property is degraded or the yarn strength is reduced. Therefore, the composite ratio of the polymer (Ab) is 20% by weight.
The following is preferred. In particular, in the case of fibers having an irregular cross-section, when the alkali is reduced, the polymer (Aa) in the sheath is removed, so that the polymer (Ab) is easily exposed to the fiber surface.
Therefore, the composite ratio of the polymer (Ab) is preferably 10% by weight or less.

It is particularly important that the core-sheath composite filament yarn of the processed yarn has a hollow part partially by cutting the polymer (Ab) disposed in the core. An example of this is shown in FIG. 2, in which a solid portion in which the polymer (Ab) is present and a hollow portion 7 in which the polymer (Ab) is cut and a hole is formed alternately exist. The presence of the hollow portion lowers the bending rigidity as compared with a normal solid yarn, and develops a sufficiently soft feeling even when the yarn is stretched to an elongation of 100% or less. is there.
In addition, this hollow portion serves as a cushion, and not only improves the soft feeling, but also dramatically improves the rebound feeling of the yarn. Here, the hollow portion has a length of 1
Cracks having a size of μm or more are mentioned, and cracks which may enter a solid portion in some cases are not included in the hollow portion. Furthermore, when the hollow part is slightly crushed, it becomes a super-fine, thick and thin yarn with alternating thick parts / details that is incomparable to conventional thick and thin yarns. It is preferable because a dry touch and beautiful gloss due to irregular reflection of light are obtained. Further, the specific gravity of the PET yarn is usually about 1.37, but the core-sheath composite filament yarn of the processed yarn has a hollow portion, and the polymer (Ab) is a lightweight polymer such as polystyrene or polymethylpentene. , The apparent specific gravity is usually P
One of the features of the present invention is that it is smaller than the ET yarn and can obtain a large lightening effect. The specific gravity of polystyrene is 1.1 and that of polymethylpentene is 0.8. In addition, this hollow part also keeps warm
It is improved as compared with the T yarn.

Hereinafter, the method for producing the composite false twisted yarn of the present invention will be described.

In the present invention, the multi-color heat sink which has not been available in the prior art is obtained by drawing at a lower natural draw ratio of the core-sheath composite filament yarn (A) or the filament yarn (B) or lower, and then performing false twisting. A composite false twisted yarn which forms a fabric having a surface change of and excellent in softness and resilience can be produced.

Here, in a state where the core-sheath composite filament yarn (A) and the filament yarn (B) are blended or combined, when drawing before false twisting, the lower one of (A) and (B) is used. It is particularly important to stretch at a natural stretching ratio or less. Thereby, both (A) and (B) have unevenness of thickness in the length direction, and the processed yarns have different thickness unevenness ratios and pitches. Thereby, when dyeing the knitted and woven fabric product of the processed yarn, it is possible to obtain a surface change of a multicolored heather which has never existed before.

After stretching at a stretch ratio higher than the lower of the natural stretch ratios (A) and (B), false twisting is performed.
Since the yarn drawn on the side drawn at a ratio higher than the natural drawing ratio does not have thick and thin unevenness, a multicolor heather like the present processed yarn cannot be obtained.

More preferably, after the core-sheath composite filament yarn (A) is drawn at a temperature not higher than the glass transition temperature of the core polymer (Ab), false twisting is performed. When pre-stretching is performed at a temperature higher than the glass transition temperature, the core polymer (Ab) is hardly cut, and as a result, the number of hollow portions is reduced, and desired softness and resilience cannot be obtained.
Therefore, it is preferable that the pre-stretching is performed at a temperature equal to or higher than the glass transition temperature of the core polymer (Ab) and then the false twisting be performed.

The false twist temperature is not particularly limited, but preferably 8 in consideration of fusing and fluff.
The temperature is 0 to 230 ° C., and preferably 150 to 220 ° C. in consideration of maximizing the shrinkage setting effect.

The conditions such as the spinning speed, fineness, cross-sectional shape, shrinkage, gloss, dyeing degree, and easy elution degree of the filament yarns (A) and (B) to be used can be combined with filament yarns of all kinds. A composite temporary twisted yarn having a desired texture can be designed.

At this time, as the blending or combining method of the core-sheath composite filament yarn A and the filament yarn B, any of spinning blending, pre-entanglement, simple alignment, or whatever may be used.

The pre-drawing does not necessarily have to be performed continuously with the false twist, and there is no problem if false twist is performed after obtaining a thick and thin drawn yarn in a separate step.

Further, in order to improve the unwinding property and the bunching property, a confounding treatment may be performed before or after false twisting. Further, the balance of unevenness can be designed by changing the magnitude of the stretching ratio of the first stretching or the length of the stretching zone.

[0044]

FIG. 3 shows a typical example of the manufacturing process.

A composite yarn of the core-sheath composite filament yarn (A) and the filament yarn (B) obtained by the spinning blending and having a high distribution and undrawn yarn 8 is supplied to a feed roller 9 and fed to a feed roller 11.
Then, pre-stretching is performed with a hot pin 10. Twister
In this method, false twisting and twisting are performed at 14, heat setting is performed by a heater 12, unrolling is performed, the roll is drawn out from a delivery roller 15, and wound up into a cheese by a winding roller 16.

Regarding the twister 14 of the twisting tool,
Any method such as a spindle type, a friction disk type, a belt nip type and a swirling flow type may be used.

If necessary, there is no problem even if the air entanglement treatment is performed after the false twisting in consideration of the passability in the subsequent step. In this case, the air treatment nozzle may be any of a confounding type, a turbulent type, and a swirling type, but the confounding type is most preferable from the viewpoint of yarn formation and shape stability.

Regarding the reheat treatment, the delivery heat treatment was performed for the purpose of adjusting to a soft texture and improving the passability of the post-process.
The composite yarn may be heat-set from the rubber 15 and wound.

Example 1 The core polymer (Ab) of the filament (A) in the example was polystyrene “Stylon” 685 manufactured by Asahi Kasei Corporation.
And polyethylene terephthalate was used for the sheath polymer (Aa). At this time, the core polymer composite ratio was set to 5.1% by weight of the whole filament yarn (A), and (A)
The total was 70 dtex and 18 filaments. The filament (B) used was polyethylene terephthalate, 70 dtex, 18 filaments.
This composite yarn was subjected to predrawing false twisting under the following conditions.・ Processing speed 400 (m / min) ・ First draw ratio 1.50 times ・ Twisting draw ratio 1.20 times ・ D / Y ratio 1.7 ・ Hot pin temperature 90 (° C) ・ Heater temperature 180 (° C) The composite false twisting yarn has U% = 6.0%, and the polystyrene disposed in the core is cut to form a hollow part partially. Had to have. The obtained yarn length difference was 4.5.
%, And the processed yarn was excellent in softness and swelling.
This was subjected to a weak twist having a twist coefficient of 3000, and a twist preventing set was performed with steam. Plain weave was created using this yarn as a warp and a weft. It was shrunk by relaxing scouring in hot water at 90 ° C, and then intermediate set at 180 ° C. Then, after the alkali weight was reduced by 20% by weight according to the conventional method, the product was dyed blue using the disperse dye according to the conventional method. The resulting fabric had an unprecedented multicolor heather surface change due to fine and irregular thick spots and hollow portions. In addition, there was a delicate swelling feeling, and the texture was excellent in softness and resilience. In addition, it was excellent in wearing comfort such as lightweight feeling and heat retention. In addition to the color difference alone, the presence of the hollow part on the glossy surface also showed a calm silky gloss.

Example 2 Prestretching was performed in the same manner as in Example 1 except that the core polymer composite ratio of the filament (A) was changed to 5.1% by weight of the whole (A). False twisting was performed. The obtained composite false twisted yarn has U% = 5.5%, and the polystyrene disposed in the core is cut to form a hollow part partially, and fine thick spots in the yarn longitudinal direction. It had alignment unevenness. The obtained yarn length difference is 0.5%
The soft feeling and the swelling feeling were a step further than in Example 1. Using this yarn, a fabric was prepared in the same manner as in Example 1. The resulting fabric had an unprecedented multicolor heather surface change due to fine and irregular thick spots and hollow portions. In addition, it was excellent in wearing comfort such as lightweight feeling and heat retention.
In addition to the color difference alone, the presence of the hollow portion on the glossy surface also showed a calm silky gloss.

Example 3 Pre-drawing false twisting was performed in the same manner as in Example 1 except that the temperature of the hot pin was 115 ° C. The above composite false twisted yarn is U% =
6.3%, and had fine thick and thin spots and orientation unevenness in the yarn longitudinal direction. The obtained yarn length difference was 4.7.
%, And the processed yarn was excellent in softness and swelling.
However, since the core polymer (Ab) is pre-drawn at a glass transition temperature (100 ° C.) or higher of polystyrene as the core polymer (Ab) and then false-twisted, the core polymer (Ab) is hard to be cut. The feeling of rebound was one step further than in Example 1. Using this yarn, a fabric was prepared in the same manner as in Example 1. The resulting fabric had an unprecedented multicolor heather surface change due to fine and irregular thick spots and hollow portions. In addition, there was a delicate swelling feeling and the texture was excellent in softness.

Comparative Example 1 Filaments (A) and (B) were each spun at 3000
(M / min) As a polyethylene terephthalate highly oriented undrawn yarn of 3700 (m / min), predrawing false twisting was performed in the same manner as in Example 1. Using this yarn, a fabric was prepared in the same manner as in Example 1. Although the obtained fabric had some heather-like surface change, it was inferior in gloss, softness and resilience.

Comparative Example 2 Pre-stretching false twisting was performed in the same manner as in Example 1 except that the pre-stretching ratio was 1.7. Since the filament yarn (B) is stretched at a natural stretching ratio or more, the obtained composite false twisted yarn does not have a fine thick and thin spot of U% = 2.6%, and the multicolor heather is not formed. No fabric was obtained.

[0054]

[Table 1]

[0055]

According to the present invention, it is possible to provide a fabric which has an unprecedented surface change of a multicolored heather, and which is excellent in softness and resilience, and further excellent in wearing comfort such as lightness and heat retention. it can.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a cross-sectional form of the filament yarns (A) and (B) of the present invention.

FIG. 2 is a schematic view showing an example of a side surface form of the composite false twisted yarn of the present invention.

FIG. 3 is a process schematic diagram showing an example of a process for producing a composite false twisted yarn of the present invention.

[Explanation of symbols]

1: core-sheath composite filament yarn (A) 2: polymer (Aa) which is substantially a polyester 3: polymer (Ab) having a temperature dependency of elongational viscosity greater than that of 2: 4: filament substantially consisting of polyester Yarn (B) 6: Unstretched portion (thick portion) 5: Stretched portion (detailed) 7: Hollow portion formed by cutting polymer (Ab) during stretching 8: Highly oriented unstretched having filament yarns A and B Thread 9: Feed roller 10: Hot pin 11: Feed roller 12: Heater 13: Cooling plate 14: Twister 15: Delivery bell roller 16: Winding roller

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Claims (7)

[Claims] 1. A polymer (A) which is substantially a polyester.
a) a core-sheath composite filament yarn (A) in which a polymer (Ab) having a temperature dependency of elongational viscosity greater than that of the polymer (Aa) is disposed in a core, and a polyester substantially comprising Is a composite false twisted yarn obtained by subjecting a yarn having a filament yarn (B) made of false twist to a false twisting process, wherein both the filament yarns (A) and (B) are irregularly thick in the yarn longitudinal direction. Wherein the polymer (Ab) disposed on the core of the core-sheath composite filament yarn (A) partially has a hollow portion. yarn. 2. The composite false twisted yarn according to claim 1, wherein the core-sheath composite filament yarn (A) and the filament yarn (B) have a yarn length difference of 1 to 10%. 3. The composite false twisted yarn according to claim 1, wherein the yarn spot variation rate U% is 4 to 15%. 4. The composite false twisted yarn according to claim 1, wherein the hollow portion formed in the core-sheath composite filament yarn (A) exists only in the details in the yarn longitudinal direction. 5. The composite false twisted yarn according to claim 1, wherein the core polymer (Ab) of the core-sheath composite filament yarn (A) is a polystyrene-based polymer. 6. A polymer (A) which is substantially a polyester.
a) a core-sheath composite filament yarn (A) in which a polymer (Ab) having a temperature dependency of elongational viscosity greater than that of the polymer (Aa) is disposed in a core portion, and substantially a polyester. The yarn having the following filament yarn (B) is drawn at a lower natural draw ratio of the lower of the core-sheath composite filament yarn (A) and the filament yarn (B), and then false twisted. A method for producing a composite false twisted yarn. 7. The composite false twist according to claim 6, wherein the core-sheath composite filament yarn (A) is drawn at a temperature not higher than the glass transition temperature of the core polymer (Ab) and then subjected to false twisting. Manufacturing method of processed yarn.