JP2003055847A - Conjugate false-twisted yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conjugate false-twisted yarn having high stretchability and bulkiness and exhibiting excellent surface quality and processability. SOLUTION: The conjugate false-twisted yarn is composed of at least two kinds of polyester polymers bonded in side-by-side state along the length of the fiber, at least one of the polyester polymers is composed of a core yarn A comprising a conjugate fiber filament composed mainly of polytrimethylene terephthalate and a sheath yarn B composed of a polyester, the core yarn A and the sheath yarn B are interlocked with each other and the false-twisted yarn satisfies the formulas: crimp recovery under load (SR) (%) >=15 and interlace-retention (C value) (%) >=80 (wherein C value (%)=(CF1/CF0)×100; CF0 is the number of interlace points before repeated stretch (number/meter); and CF1 is the number of interlace points after repeated stretch (number/meter).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite false twisted yarn having both high stretchability and high entanglement retention, bulging, soft and good surface quality, and a method for producing the same. .

[0002]

2. Description of the Related Art Conventionally, a composite false twisted yarn is generally manufactured by a method in which two types of filament yarns having different elongations are aligned and entangled and then false twisted. That is,
When filament yarns with different elongations are aligned and false twisted, the filament yarns with low elongation are located in the core, and the filament yarns with high elongation are wound around the core yarn and wound around them. Then, a composite false twisted yarn having a two-layer core-sheath structure is produced (Japanese Patent Publication No. 59-39526 and Japanese Patent Publication No. 61).
-19733 publication).

However, in the core-sheath two-layer structure processed yarn obtained by such a method, since the sheath yarn is generally wound around the core yarn in an alternate twisted yarn shape, the twisted yarn structure causes an ordinary temporary yarn to be wound. It is characterized by improving the feeling of sticking and the rubber state, which are the drawbacks of twisted yarn woven fabrics, but on the other hand, since the core yarn is tightened by the sheath yarn, the crimp of the core yarn is originally crimped. Since it is located at, it has a drawback that it is difficult to develop crimp of the core yarn and lacks in stretchability like ordinary false twisted yarns, in combination with the crimp form having a low sweet twist state. It was

If the difference in yarn length is large, a bulky and bulged composite false-twisted yarn can be obtained. However, if the yarn length difference in the conventional composite false-twisted yarn is increased, for example, the twisted yarn will be twisted during additional twisting. The yarn is squeezed by the traveler of the machine, and the sheath yarn shifts in the longitudinal direction of the yarn and becomes unevenly distributed, which causes a rough texture and white streaks in terms of product quality. The occurrence of so-called nep, which causes the problem, has been a problem.

For example, in Japanese Unexamined Patent Publication No. 2000-328376, the core yarn is made of polytrimethylene terephthalate,
There has been proposed a composite false twisted yarn in which polyethylene terephthalate is aligned with a sheath yarn, false twisted after entanglement.

[0006] However, although this processed yarn surely exhibits excellent stretchability, when the core-sheath yarn length difference is large and a bulky and bulged processed yarn is to be obtained, the entanglement of the yarn length difference becomes unfavorable, and nep There was a big problem, such as the occurrence of.

It is considered that this is because the structural elasticity of the polytrimethylene terephthalate filament of the core yarn repels the core yarn immediately before it is entangled with the sheath yarn by the interlace nozzle, and the entanglement retention rate becomes weak.

[0008]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a composite false twisted yarn having both high stretchability and high entanglement retention, and having a bulge, soft and good surface quality, and its production. To provide a method.

[0009]

In order to achieve the above-mentioned object, a composite filament processed yarn and a method for producing the same according to the present invention have the following constitutions. That is, (1) a core yarn A in which different types of polyester polymers are bonded side by side along the fiber length direction, and at least one of the polyester polymers is a composite fiber filament mainly composed of polytrimethylene terephthalate. , The sheath yarn B made of polyester, the core yarn A and the sheath yarn B are entangled with each other, and the sag recovery rate under load (SR) and the entanglement retention rate (C value) satisfy the following expressions. Characteristic composite false twisted yarn.

Recovery rate under load (SR) (%) ≧ 15 Entanglement retention rate (C value) (%) ≧ 80 where C value (%) = (CF1 / CF0) × 100 CF0: Before repeated extension Entanglement number (co / m) CF1: Entanglement number after repeated elongation (co / m) (2) Of the polyester polymer components constituting the composite fiber filament of the core yarn A, the other is mainly composed of polyethylene terephthalate. The composite false twisted yarn according to (1) above, which is composed of components.

(3) 70% recovery of elongation at 20% elongation
The composite false twisted yarn according to any of (1) or (2) above, which is the above.

(4) Different polyester polymers are laminated side by side along the fiber length direction, and at least one of the polyester polymers is a composite fiber filament containing polytrimethylene terephthalate as a main component, and the composite fiber. A method for producing a composite false twisted yarn, which comprises twisting together a filament made of polyester having a higher elongation than the filament and then false twisting the filament.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The composite false twisted yarn of the present invention is a core yarn A.
By using a filament satisfying the following formula for the sheath yarn B, it is possible to have both high stretchability and entanglement retention.

Recovery rate under load (SR) (%) ≧ 15 Entanglement retention rate (C value) (%) ≧ 80 However, entanglement retention rate (C value) (%) = (CF1 / CF
0) × 100 CF0: Entanglement number before repeated elongation (co / m) CF1: Entanglement number after repeated elongation (co / m) Ken shrink recovery rate under load (SR) is the actual weaving structure This is a method for measuring the degree of contraction assuming the degree of contraction. In this method, the yarn is heat-treated in a state where the yarn is tightened by restraint. In order to achieve a high stretch, it is necessary that a large amount of crimping be manifested during heat treatment. The degree of occurrence of crimping under a load is determined by the crimping stress. The recovery rate under load is a stretch measurement method in which a heat treatment is performed under a load in order to assume the stress that causes shrinkage.

The elastic recovery characteristics of the composite fiber filaments mainly composed of polytrimethylene terephthalate after being subjected to extensional deformation are very excellent as compared with other fibers such as polyethylene terephthalate fiber, and further the coil crimp By false-twisting the manifested filament, it is possible to obtain a composite false-twist textured yarn having high stretchability.

If the rate of recovery from shrinkage under load (SR) is less than 15%, the resulting woven or knitted fabric will have poor stretchability. Also,
If it exceeds 60%, the crimping is too strong to give a textured fabric, which is not preferable. Therefore, SR is preferably 60% or less.

The entanglement retention rate (C value) is an index showing how strongly the entanglement composed of the core yarn A and the sheath yarn B is entangled.

In the present invention, since the difference in yarn length is large, a bulky and bulged composite false twisted yarn can be obtained. However, in the conventional composite false twisted yarn, when the difference in yarn length is increased,
For example, the yarn is twisted by the traveler of the twisting machine at the time of additional twisting, and the sheath yarn shifts in the longitudinal direction of the yarn and becomes unevenly distributed, which causes a rough texture and white streaks in terms of the quality of the product. The problem is the occurrence of so-called nep, which causes defective setting and yarn breakage. To prevent the occurrence of nep,
It is important to make a composite false twisted yarn that has a entanglement that cannot be unraveled even after repeated stretching.

In the composite false-twisted yarn of the present invention, at least two kinds of polyester polymers are attached to the core yarn A side by side along the fiber length direction, and at least one of the polyester polymers is polytrimethylene terephthalate. The main component is a composite fiber filament.

The side-by-side type composite fiber develops crimps due to the difference in elastic recovery rate and shrinkage characteristics thereof, and distortion occurs within the single fiber to take the form of three-dimensional coil crimp. The core yarn A in which the coil crimp is manifested is easily opened in the nozzle, and the entanglement with the sheath yarn can be made stronger. In addition, when the crimp having excellent stretch characteristics peculiar to polytrimethylene terephthalate becomes apparent, the core yarn A stretches back immediately before the interlace nozzle and is entangled while winding the sheath yarn B. The sheath yarn B is twisted and inverted around the periphery, and there are substantially many non-opened portions. Therefore, the composite false twisted yarn of the present invention can have a strong entanglement against a load that satisfies the above formula.

Further, the number of confounding before and after the repeated elongation (CF
0, CF1) is preferably 50 or more. When it is less than 50, nep occurs in the processed yarn having a large difference in yarn length, which is not preferable.

However, even if there is too much entanglement, the surface of the woven or knitted fabric may be irritated or the texture may be hard. From this, CF0 and CF1 are preferably 200 or less.

The yarn length difference of the composite false twisted yarn of the present invention is preferably 15% or more, more preferably 50% or less.
If the yarn length difference is less than 15%, it becomes difficult to obtain a bulky and bulged textured yarn. Also, the difference in yarn length is 50%
If it exceeds, nep is likely to occur and yarn breakage is likely to occur, which is not preferable.

In the present invention, at least one of the two types of side-by-side polyester polymers constituting the composite fiber of the core yarn A is made of polytrimethylene terephthalate.

Polytrimethylene terephthalate (hereinafter P
TT) means that terephthalic acid is the main acidic component,
It is a polyester obtained by using 1.3 propandiol as a main glycol component. Further, that the yarn is made of polytrimethylene terephthalate means that the polymer component constituting the fiber has trimethylene terephthalate as a main repeating unit.

The yarn made of PTT has a low bending rigidity, and when the processed yarn of the present invention is used as a fabric, a soft texture can be obtained. Other copolymerizable components capable of forming an ester bond may be contained in a range that does not impair the effects of the present invention, preferably 20 mol% or less, more preferably 10 mol% or less. Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while the glycol component includes, for example, ethylene glycol-
Examples thereof include, but are not limited to, ethylene glycol, butenediol, butanediol, neopentyl glycol, cyclohexane dimethanol, polyethylene glycol and polypropylene glycol.
Further, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, a hindered phenol derivative as an antioxidant, a color pigment and the like can be added as required.

The intrinsic viscosity of this polytrimethylene terephthalate is preferably 0.5 or more and 1.2 or less.
By setting it to 0.5 or more, stable spinning becomes possible,
Thread breakage does not occur. In addition, it is possible to obtain a yarn in which unevenness in fineness is suppressed and which is excellent in tensile strength and flex abrasion resistance. Further, by setting the intrinsic viscosity to 1.2 or less, stable spinning can be performed, and the texture of the fibers can be made soft. More preferably, it is 0.8 or more and 1.0 or less.

Further, of the two kinds of polyester polymer components of the core yarn A, the other component is preferably composed mainly of polyethylene terephthalate.

The side-by-side type composite fiber develops crimps due to the difference in elastic recovery rate and shrinkage characteristics thereof, and distortion occurs within the single fiber to take the form of three-dimensional coil crimp.

When polyethylene terephthalate and polytrimethylene terephthalate are side-by-side type,
Due to the large difference in shrinkage characteristics between the two, the resulting three-dimensional coil crimp diameter is reduced and the number of coils per unit fiber length is increased. As a result, the crimp pitch of the core yarn can be made fine, and a soft-touch woven or knitted fabric can be obtained.

The composite ratio of both components of the composite fiber constituting the core yarn A of the composite false twisted yarn of the present invention is 8: 2 by weight.
The range of 2: 8 is preferable. More preferably, it is from 6: 4
It is 4: 6. Outside of this range, the components on the high shrinkage side or the low shrinkage side are reduced and the coil crimp becomes coarse, which is not preferable.

On the other hand, a yarn made of polyester is used for the sheath yarn B of the processed yarn of the present invention. The polyester yarn refers to a filament yarn whose main component is any one of polyethylene terephthalate, polymethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyhexamethylene terephthalate. From the viewpoint of iron resistance, it is preferable to use polyethylene terephthalate. When polytrimethylene terephthalate is used for the sheath yarn, the surface touch of the woven fabric has a nylon-like soft touch, which is also preferable.

Regarding the elastic recovery of the composite false twisted yarn used in the present invention, the elongation recovery rate at 20% elongation is preferably 70% or more, and more preferably 99.5% or less. In order to obtain a woven and knitted fabric with excellent wear comfort in which the expansion and contraction of the woven and knitted fabric easily follow the movements of various parts of the body, it is preferable that the elastic recovery is large. It is not preferable because the tightening feeling is too strong.

The Young's modulus of the composite false twisted yarn of the present invention is preferably 15 cN / dtex or more and 35 cN / dtex or less. The Young's modulus of the processed yarn can be controlled by, for example, the type of the original yarn, the filament composition, the provisional twisting condition, the additional twisting condition, etc., but it is a main factor that determines the texture such as bending softness when the knitted fabric is formed. Become. When the Young's modulus is 35 cN / dtex or less, the texture becomes soft, and when the Young's modulus is 15 cN / dtex or more, the firmness and resilience can be maintained.

When a knitted fabric using the composite false twisted yarn of the present invention is dyed, a spunlike knitted fabric having a dull color difference can be obtained. By surrounding the core yarn A, which is a component of polytrimethylene terephthalate, which is dyed more deeply than polyethylene terephthalate, with a sheath yarn B yarn made of polyester such as polyethylene terephthalate, it is possible to obtain a natural-looking dullness difference with a blurred color difference You can

The fibers of the core yarn and the sheath yarn of the present invention may be uniform or thick in the length direction of the cross section of the single yarn, and the cross section is round, triangular, flat, hexagonal, L-shaped. , T type, W
Types, polygonal types such as Yachiba type, dogbone type, various types,
Although a hollow type or the like can be arbitrarily selected, in the core yarn, a round type is selected if the stretch back property is important, and a dogbone type or a flat type is preferable if a smooth texture is desired.

When the dog-bone type or flat type is selected for the core yarn, the phase of coil crimping for each single-filament filament is deviated, so that the fibers are more easily opened during entanglement, resulting in strong entanglement.

The total fineness of the false twisted yarn of the present invention is 3
It may be appropriately selected within the range of 0 Dtex to 1000 Dtex according to the purpose of use. In order to obtain a soft touch, the filament fineness of the filament yarn of the sheath yarn B is 3 dte.
x or less, more preferably 0.5 to
It is 1.5 dtex. The monofilament fineness of the composite fiber composing the core yarn A is 1 dt in order to give the fabric elasticity and elasticity.
It is preferably ex or more, more preferably 1.
It is 5-8 dtex.

Next, a method of false twisting using the core yarn A and the sheath yarn B will be described. In the method for producing a composite false twisted yarn of the present invention, a polytrimethylene terephthalate filament and a filament made of polyester having a greater elongation than the polytrimethylene terephthalate filament are combined and entangled, and then false twisting is performed. Give.

When two or more kinds of filaments having different elongations are combined and subjected to an entanglement treatment, first, a fixation between both filaments that can withstand false twisting can be obtained.
If false twisting is performed without performing this entanglement treatment, it may cause fuzz and tarmi. Next, when false twisting is performed, the filament on the high elongation side is selectively drawn in the false twisting step, and a yarn length difference occurs between the filament on the low elongation side and
A composite false twisted yarn can be obtained in which the low elongation side is the core yarn and the high elongation side is the sheath yarn. The elongation difference is as follows: 40 ≦ elongation on high elongation side (%) − elongation on low elongation side (%)
≦ 200 · 60 ≦ elongation (%) on high elongation side ≦ 250 · 10 ≦ elongation (%) on low elongation side ≦ 50

In the present invention, the core yarn A can be supplied as a drawn yarn and the other sheath yarn B made of polyester can be supplied as a semi-drawn yarn.

Alternatively, a semi-stretched yarn may be used for both filaments, and the core yarn A on the low elongation side may be stretched at a temperature not lower than the glass transition temperature via a hot pin and then combined with the other semi-stretched yarn.

FIG. 2 is a schematic view showing an example of the method for producing the composite false twisted yarn of the present invention. The core yarn A and the sheath yarn B are aligned on the feed roller 1 and preferably 1.0 by the nozzle 2.
Entanglement treatment is performed at ˜5.0 MPa. Of course, if the pneumatic pressure of the nozzle is increased, a strong entanglement can be imparted, but fluffing and yarn breakage increase, so it is not preferable that the pressure exceeds 5.0 MPa. If it is less than 1.0 MPa, strong entanglement cannot be imparted.

As the nozzle for performing the entanglement treatment in the present invention, either a fluid disturbing nozzle such as a so-called Taslan nozzle or an interlaced nozzle may be used. Here, the core yarn A is pulled by the feed roller 1, is guided to the entanglement zone composed of the nozzles 2 via the feed roller 1 while being unwound, and is relaxed at the moment of entering the entanglement zone. In A, since the crimp is actualized, it stretches back immediately before the nozzle 2 and is entangled while winding the sheath yarn B, and the sheath yarn B is separated into the core yarn A after false twisting by the twisted body 5. It becomes a core-sheath structure in which it is tightly wrapped around in an alternating twisted shape without any matter.

Further, if the pneumatic pressure of the nozzle 2 is increased and a strong entanglement is imparted, the generation of nep can be suppressed, but fluffing and yarn breakage increase, and the sheath yarn is restrained by the entanglement, so that the stretchability disappears. In addition, as a core-sheath structure in which the core yarn is wound in an alternate twist shape, the yarn length difference is extremely small, and the textured yarn has no bulge and has a strong coarse and hard feeling.

It is preferable to provide an overfeed of 0.5 to 5.0% between the feed roller 1 and the feed roller 3 because the entanglement can be performed more efficiently.

The entangled yarn is introduced into the false twist heater 4 while being false twisted by the twisted body 5, and heat set. As the twisted body used for false twisting, a pin, a friction, a belt nip, or the like can be used. The false twist heater temperature is preferably in the range of 130 ° C to 200 ° C. By setting the false twisting temperature to 130 ° C. or higher, sufficient crimping is provided and good stretchability is obtained.
Further, by setting the false twisting temperature to 200 ° C. or less, it is possible to suppress the strength decrease due to the heat deterioration of the fiber, the breakage of single yarn and the generation of fluff. In particular, when polytrimethylene terephthalate yarn is also used for the sheath yarn, the false twisting temperature is more preferably 170 ° C. or lower because the melting point is low.

The false twisted processed yarn passes through the delivery roller 6 and is wound up by the take-up roller 7.

After the actual twist is put into the false twist textured yarn of the present invention and further made into a woven fabric, it is possible to add a weight reduction or the like to give an appropriate elasticity.

The entanglement retention rate, the compression recovery rate under load, the extension recovery rate, and the Young's modulus in the present invention are evaluated by the following methods. (1) Entanglement retention rate (C value) -Measurement of the number of entanglements The number of entanglements is the number of entangled parts per 1 m under a tension of 0.1 g / d, and the number of entangled parts in a non-entangled part is 0.02 g / d. The pin is pierced, and the pin is moved up and down in the longitudinal direction of the yarn with a tension of 0.1 g / d over 1 m of the yarn, and the moved distance is defined as the non-entangled part, and the part where the pin stops is defined as the entangled part. Here, the untwisted portion of the yarn is also counted as the entangled portion. Further, the portion in which the sheath yarn is wound around the core yarn at 360 ° or more is counted as the entangled portion, and the number of entanglements per 1 m is calculated.・ Repeated extension Using a constant-speed extension type tensile tester with a self-recording device, it was attached at a gripping interval of 20 cm with an initial load of 0.08826 cN per decitex and a pulling speed of 20 cm.
/ Min, stretch to 10% elongation, immediately unload at the same speed and completely unload. This work 1
Repeat 0 times. -Calculation of entanglement retention ratio (C value) Repeatedly measuring the number of entanglement before and after extension,
Calculate the value (%).

C value (%) = (CF1 / CF0) × 100 CF0: Number of entanglements before repeated extension CF1: Number of entanglements after repeated extension (2) Ken shrinkage recovery rate under load (SR) Perimeter of 0.8 m The tape is wound around a measuring machine 10 times under a tension of 90 mg / dtex to remove the burrs, then hung on a rod of 2 cm or less and left for about 24 hours. 4mg / dt of this syrup
Under a tension of ex, hot water treatment is performed at 90 ° C. for 20 minutes, and then the piece is hung on a rod of 2 cm or less and left for about 12 hours. After leaving, the hook is hooked at one end and an initial load and a measurement load are applied to the other end, and the hook is hung in water and left for 2 minutes. Initial load at this time (g) = 1.8 mg / dtex, measured load (g) = 9
0 mg / dtex, water temperature = 20 ± 2 ° C. Measure the length of the inside of the left case and set it as L. Furthermore, the measurement load is removed and the load is left for 2 minutes with only the initial load, and the inner length of the left cassette is measured and designated as L1. From the following formula, the recovery rate under load is calculated. Recovery rate under load (SR) (%) = {(L-L1) /
L} × 100 (3) Elongation recovery rate Using a constant speed extension type tensile tester with a self-recording device, it was installed at a gripping interval of 20 cm with an initial load of 0.08826 cN per decitex applied, and a pulling speed of 20 cm.
/ Min to 20% elongation, and immediately unloading at the same speed. Immediately after complete unloading,
Elongate to the initial load and obtain the elongation recovery rate from the recovery elongation at this time. (4) Young's modulus Measured using a constant speed extension type tensile tester according to the initial tensile resistance measurement described in JIS-L-1013, 8.10.

[0052]

EXAMPLES The present invention will be specifically described below with reference to examples.

The evaluation in the examples was carried out 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, Comparative Example 1 which is a conventional product
Using the woven fabric of No. 2 as a standard, the following criteria were used to perform a five-level evaluation, and the evaluation results of 10 panelists were averaged for the judgment. 5: Extremely soft texture 4: Slightly soft texture 3: Texture equivalent to standard woven fabric 2: Slightly hard texture 1: Extremely hard texture.

(2) Evaluation of surface quality The surface quality of the woven fabric obtained by the method described in Examples and Comparative Examples is
Sensory evaluation was performed by touch. At this time, the woven fabric of Comparative Example 1 which is a conventional product was used as a standard, and a five-level evaluation was performed according to the following criteria, and the evaluation results of 10 panelists were averaged and judged. 5: Extremely good surface quality 4: Slightly good surface quality 3: Surface quality equivalent to standard woven fabric 2: Slightly poor surface quality 1: Extremely poor surface quality (Example 1) Polytrimethylene terephthalate for core yarn Using 83 dtex, 24 filaments, and drawn yarn having an elongation of 36.2%, which was obtained by side-by-side compounding polyethylene and polyethylene terephthalate with a compounding ratio of 5: 5.

As the sheath yarn, a highly oriented undrawn yarn of polyethylene terephthalate having 106 dtex, 36 filaments and an elongation of 168.2% was used.

Using the false twisting process shown in FIG. 2, composite false twisting was carried out under the conditions shown in Table 1 to obtain a composite false twisted yarn. The C value of the obtained processed yarn was 95.6%, and the bulky core yarn,
It was found that the sheath threads were tightly entangled with each other. Also,
The SR was 24.2%, the elongation recovery rate was 86.3 (%), and the Young's modulus was 16 (cN / dtex), and the stretchability was also good.

The composite false-twisted yarn thus obtained was applied in the S direction by 50
Additional twist at 0T / m and used as weft, 56Dt as warp
Using ex, 24-filament polyethylene terephthalate stretched yarn (twisted at 250 T / m in the S direction) was woven with a rapier loom using a 3/1 twill to form a woven fabric. Continue to relax scouring with hot water at 97 ℃, dye with Terrasil navy blue disperse dye at 130 ℃,
Final heat fixing was performed at 160 ° C. to obtain a composite temporary twist process. A fabric using this composite false twisted yarn had high stretchability, swelling, and a feeling of repulsion, and also had a soft touch. In addition, the texture was spun-like and the surface quality of the fabric was good.

(Comparative Example 1) 83 dtex, 24 for core yarn
A filament and drawn polytrimethylene terephthalate yarn having an elongation of 35.4% were used. The same polyethylene terephthalate highly oriented undrawn yarn as in Example 1 was used for the sheath yarn. Using the false twisting process shown in FIG. 2, composite false twisting was performed under the conditions of Table 1 to obtain a composite false twisted yarn. The obtained textured yarn has an SR of 22.1 (%) and an elongation recovery rate of 82.9.
(%), Young's modulus was 16.4 (cN / dtex), and the stretchability was good, but the C value showing the entanglement performance was 7
With 3%, there was a problem that the entanglement was insufficient and a nep was generated.

Using this processed yarn, a fabric was prepared in the same manner as in the example. The obtained fabric showed high stretchability, but the fabric had a rough texture and white streaks, probably because the sheath yarns were displaced in the longitudinal direction of the yarn and were unevenly distributed. Further, due to poor weft unwinding, the loom was frequently stopped, and process passability became a problem.

Comparative Example 2 83 dtex, 24 for the core yarn
A filament and a polyethylene terephthalate drawn yarn having an elongation of 36.6% were used. The same polyethylene terephthalate highly oriented undrawn yarn as in Example 1 was used for the sheath yarn. Using the false twisting process shown in FIG. 2, composite false twisting was performed under the conditions of Table 1 to obtain a composite false twisted yarn. The C value showing the entanglement performance of the obtained textured yarn was 81.3, which showed a good entanglement performance, but the SR was 9.8 (%) and the elongation recovery rate was 45.5.
(%), Young's modulus was 32.2 (cN / dtex), and stretchability was poor.

Using this processed yarn, a fabric was prepared in the same manner as in the example. Although the obtained fabric had a bulge, it had poor stretchability, lacked a soft feel, and had a coarse and hard feel.

[0063]

[Table 1]

[0064]

As described above, the composite false twisted textured yarn of the present invention is a composite false twisted textured yarn having both high stretchability and high entanglement retention.

In the present invention, since the core yarn A has the actualized coil crimp, it is possible to obtain a composite false twisted yarn which is bulky, swelling and repulsive. Further, since the entanglement performance is high, nep and thread breakage do not occur.

Further, the elastic recovery property of the composite fiber filament mainly composed of polytrimethylene terephthalate after the extensional deformation is imparted is very excellent, and further the false twisting of the added filament in which the coil crimp is actualized is carried out. It can give high stretchability.

When polyethylene terephthalate and polytrimethylene terephthalate are made side-by-side in the core yarn, the crimp pitch of the core yarn can be made fine, and a soft-touch woven or knitted fabric can be obtained.

When the knitted fabric using the composite false twisted yarn of the present invention is dyed, a spun-like knitted fabric having a natural-feeling scrapy dyeing difference in which the color difference is blurred can be obtained.

If the cross-sectional shape of the core yarn is round, the stretch-back property can be emphasized, and if it is dog-bone type or flat type, a fabric with a smooth texture can be obtained.

Since the composite false twisted yarn of the present invention is excellent in bulkiness, it is a woven or knitted fabric having a bulge and being excellent in lightness and heat retention. Moreover, since it is also excellent in entanglement properties, it becomes a woven or knitted fabric having excellent surface quality.

Further, since the stretch characteristics are excellent, the woven and knitted fabric can sufficiently follow the stretch, especially in sports clothing, and the occurrence of cracks on the elbows and knees can be suppressed.

A fabric made of the composite false twisted yarn of the present invention is
Outerwear such as jackets and bottoms, women's clothing such as dresses, skirts, arm warmers, and stockings, sports clothing such as jerseys, athletic wear, and ski wear, and towels, umbrellas, and cores for industrial use. It can be used as a stretch material for ground, toothbrush, fishing line, rope, artificial grass, car seat and the like.

[Brief description of drawings]

FIG. 1 is a side view of a composite false twisted yarn obtained according to the present invention.

FIG. 2 is a schematic view showing an example of a processing step for obtaining a processed yarn of the present invention.

[Explanation of symbols]

A: Core thread B: sheath thread 1: Feed roller 2: Interlace nozzle 3: Feed roller 4: Hot plate 5: twisted body 6: Delivery roller 7: Take-up roller

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Claims (4)

[Claims] 1. A core yarn A in which different kinds of polyester polymers are laminated side by side along the fiber length direction, and at least one of the polyester polymers is a composite fiber filament mainly composed of polytrimethylene terephthalate. , The sheath yarn B made of polyester, the core yarn A and the sheath yarn B are entangled with each other, and the sag recovery rate under load (SR) and the entanglement retention rate (C value) satisfy the following expressions. Characteristic composite false twisted yarn. Recovery rate under load (SR) (%) ≧ 15 Entanglement retention ratio (C value) (%) ≧ 80 However, C value (%) = (CF1 / CF0) × 100 CF0: Entanglement number before repeated extension ( Co / m) CF1: Number of entanglements after repeated elongation (co / m) 2. The composite false twisting process according to claim 1, wherein, of the polyester polymer components constituting the composite fiber filament of the core yarn A, the other is composed of a component mainly composed of polyethylene terephthalate. yarn. 3. The composite false twisted yarn according to claim 1, wherein the elongation recovery rate at 20% elongation is 70% or more. 4. A composite fiber filament in which different kinds of polyester polymers are laminated side by side along the fiber length direction, and at least one of the polyester polymers is mainly composed of polytrimethylene terephthalate.
A method for producing a composite false twisted yarn, which comprises twisting together a filament made of polyester having a higher elongation than the composite fiber filament, and then performing false twisting.