JPH09195142A - Conjugated yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester conjugated yarn suitable as a woven or a knitted fabric, excellent in touch feeling and stretchability without deteriorating the touch feeling even after recovery from extension. SOLUTION: This conjugated yarn comprises a yarn composed of a polyester containing polypropylene terephthalate having >=0.8 intrinsic viscosity as a main constituent component as a core yarn and a yarn composed of synthetic fibers and/or natural fibers comprising a polymer other than the polypropylene terephthalate as a sheath yarn in the periphery and is obtained by winding the sheath yarn around the core yarn so as to provide (2/8) to (8/2) weight ratio of the core to the sheath components.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite yarn suitable for a woven or knitted fabric which is excellent in feeling and stretchability.

[0002]

2. Description of the Related Art Conventionally, long fibers made of synthetic fibers such as polyethylene terephthalate (PET) have been used as core yarns.
Since the composite yarn wound with short fibers made of natural fibers such as cotton and wool has the mechanical properties such as the feel of natural fibers and the strength of synthetic fibers, socks and dresses for woven and knitted fabrics are used. , Mainly used for suits and other clothing.

However, since such a composite yarn is not sufficiently stretchable, it has not been suitable for sports applications where stretch materials are preferably used.

Therefore, in order to impart elasticity to the woven or knitted fabric, there has been proposed a composite yarn in which a fiber having a polyurethane or polyether ester as a constituent component is used as a core yarn. Although it is excellent, the tensile stress generated during stretching is so low that the fiber stretches too much, and the core yarn and sheath yarn of the composite yarn that composes the woven or knitted fabric may separate, resulting in poor texture after stretching and recovery. ， There was a problem that the knee was missing.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a composite yarn which does not have such problems, is excellent in feeling, has sufficient stretchability, and is suitable for a woven or knitted fabric which does not deteriorate in feeling even after elongation and recovery. Is what you are trying to do.

[0006]

SUMMARY OF THE INVENTION The present invention achieves the above object, and its gist is as follows.

That is, according to the present invention, a yarn made of polyester having polypropylene terephthalate having an intrinsic viscosity of 0.8 or more as a main constituent is used as a core yarn, and a sheath yarn is formed around the core yarn from a chemical fiber and / or a natural fiber. The core component and the sheath component are 2/8 by weight ratio.
The gist is a composite yarn characterized by being 8/2.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. In order to obtain a woven or knitted fabric which is excellent in texture and does not deteriorate in texture even after elongation and recovery, which is the target of the present invention, the core yarn constituting the composite yarn has an intrinsic viscosity of 0.
A yarn made of polyester having 8 or more polypropylene terephthalate (PPT) as a main constituent is used. When the intrinsic viscosity is less than 0.8, a fiber having practically sufficient strength cannot be obtained, and a composite yarn suitable for the target woven or knitted fabric of the present invention cannot be obtained, which is not preferable. Considering the characteristics and productivity of the obtained PPT, it is preferable to use one having an intrinsic viscosity in the range of 0.8 to 1.3. When the intrinsic viscosity exceeds 1.3, it is necessary to raise the temperature and the pressure in the melt spinning considerably, which causes the decomposition of the polymer and the obtained yarn tends to be poor in the uniformity, which is not preferable. .

The tensile stress at 30% elongation of the core yarn of the composite yarn of the present invention is preferably 3.0 g / d or more. 3
When the tensile stress at 0% elongation is less than 3.0 g / d, the fibers are excessively elongated when elongated, and the core yarn and the sheath yarn of the composite yarn tend to be separated, which is not preferable.

If necessary, the PPT of the present invention contains isophthalic acid, phthalic anhydride, dodecanedioic acid, azelaic acid, sebacic acid, bisphenol A, bisphenol S, as long as the object of the present invention is not impaired. p,
p'-bisphenol, 1,4-naphthalenedicarboxylic acid,
Other auxiliary materials such as 2,4-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid and their ester-forming derivatives may be copolymerized, and various additives are included. It may be.

The intrinsic viscosity of the composite yarn of the present invention is 0.8.
An example of the manufacturing method for obtaining the above PPT will be specifically described, but the manufacturing method is not limited to this.

First, 1,3-propanediol (1,3-P
D) and terephthalic acid (TPA) are subjected to an esterification reaction to obtain a reaction product having an esterification reaction rate of 92 to 98%. Next, a catalyst (tetrabutyl titanate or sulfosalicylic acid is preferable) is added to the obtained reaction product, and the mixture is concentrated under reduced pressure.
By carrying out the polycondensation reaction at a temperature of 240 to 250 ° C. for 3 to 5 hours, PPT having an intrinsic viscosity of 0.8 or more can be obtained.

When melt-spinning the PPT obtained by the above method, additives such as a stabilizer, a fluorescent agent, a pigment and a reinforcing agent may be present together.

In order to obtain a woven or knitted fabric which is excellent in desired texture and does not deteriorate in texture even after being stretched, the composite yarn of the present invention is made of a chemical fiber and / or a natural fiber around the core yarn. It is necessary to wind the following yarn as a sheath yarn. As the sheath yarn, it is not always necessary to use PPT, and polyester fibers such as polyethylene terephthalate, polyamide fibers such as nylon 6, chemical fibers such as rayon and acetate, and / or natural fibers such as cotton, wool and hemp can be appropriately selected. Good. Examples of the form of the yarn used as the sheath yarn include slit yarns made of polyester-based synthetic polymers such as polyethylene terephthalate, polyamide-based synthetic polymers such as nylon 6, unprocessed yarns of long fibers, false twisted yarns and the like. . Alternatively, a spun yarn obtained by mixing polyester fibers such as polyethylene terephthalate and the like, polyamide materials such as nylon 6 and short fibers such as rayon, acetate, cotton, wool and hemp may be used. The fiber material and form of these sheath yarns are arbitrarily selected according to the purpose such as feeling.

The weight ratio of the core component composed of the core yarn and the sheath component composed of the sheath yarn must be 2/8 to 8/2, and the weight of the core component / the sheath component is required. When the ratio is less than 2/8, sufficient stretchability is not provided and the object satisfying the object of the present invention is not obtained, which is not preferable, while when it exceeds 8/2, the fibers constituting the sheath component are The core component cannot be sufficiently wrapped, and the texture of the fibers constituting the sheath component is not sufficiently expressed.

As a method for obtaining the composite yarn of the present invention by arranging the above-mentioned sheath yarn around the core yarn made of polyester whose main component is PPT, a spinning machine is used, and the core yarn is placed at the center of the sheath yarn. Examples thereof include a feeding method, a method of overfeeding a sheath yarn by using a false twisting machine, and a general covering method, which may be appropriately selected according to the use of the woven or knitted fabric made of the composite yarn of the present invention.

Further, the cross-sectional shape of the fiber group constituting the composite yarn of the present invention may be a round cross section, a triangular cross section or the like, and is not particularly limited.

[0018]

The composite yarn of the present invention is composed of three core yarns constituting the composite yarn.
The recovery rate at 0% elongation is higher than that of polyethylene terephthalate and polybutylene terephthalate, and the tensile stress generated during elongation is high. Not too much. For this reason, the core yarn and the sheath yarn do not separate, and it is presumed that the texture after elongation recovery does not decrease.

[0019]

EXAMPLES Next, the present invention will be specifically described with reference to examples. The method for measuring the characteristic values is as follows.

(1) Intrinsic viscosity [η]: Measured at a temperature of 20 ° C. using an equal weight mixture of phenol and ethane tetrachloride as a solvent.

(2) Tensile strength (g / d), tensile stress at 30% elongation (g / d): Tensilon UTM-4-1 manufactured by Oriental Co., Ltd. using a core yarn constituting a composite yarn as a sample.
The measurement was performed using a 00 type with a sample length of 10 cm and a pulling speed of 10 cm / min. The number of measurements was 10 and the average value was used.

(3) Restorability (R): A core yarn constituting a composite yarn is used as a sample, a sample length L ₀ is measured by applying a load of 100 mg / d to the sample, and then stretched by 30%. Next, the sample is left unloaded for 30 minutes. After repeating this operation 10 times, a load of 100 mg / d is applied again and the sample length L ₁ is measured and calculated by the following formula. R is 100
The closer to, the better the resilience. R value is 95-100
It was judged to be in the range of. R = (L ₁ / L ₀ ) × 100
.

(4) Feeling, feeling after elongation recovery: Each of the swelling, softness, drape, and tension of the woven fabric woven by using the composite yarn was judged by sensory evaluation in eight stages. Grade 8 is the best case, 1 is the worst case
It was evaluated as a grade, and all grades of 5 or higher were accepted.

Next, a sample of 10 cm × 30 cm was applied with a load of 5 kg in the long piece direction, stretched, and allowed to stand for 30 minutes with no load applied to the sample for swelling, softness, drape, and tension. The evaluation was made in 8 grades. Grade 8 was the best case, and grade 1 was the worst, and all grades 5 and above were accepted.

Production Example 1,3-Propanediol (1,3-P was added to the esterification reactor.
D) 30.4 kg and terephthalic acid (TPA) 33.2 kg were charged, and the esterification reaction was carried out at 240 ° C. for 4 hours under the suppression of 3 kg / cm ² G. The obtained esterification reaction product 40k
transferring the g in the polymerization reactor, acid component per mol of tetrabutyl titanate 2 × 10 ^-4 mol was added, under a reduced pressure of 0.5 Torr, for 3 hours polycondensation reaction at 250 ° C., the chip by a conventional method The P having an intrinsic viscosity of 0.92
I got PT.

Example 1 PPT spinning temperature 290 ° C., spinning speed 1400 m / mi
The unstretched yarn spun at n is drawn at a drawing speed of 700 m.
/ Min, heating roller temperature 80 ℃, hot plate temperature 16
It was stretched 3.5 times under the condition of 0 ℃ and wound up.
A drawn yarn having a yarn quality of 0d / 12f, elongation of 42% and boiling water shrinkage of 10% was obtained. Using a normal ring spinning machine, 15
In the center of the 0th cotton spun yarn, the drawn yarn (3
0d / 12f), and the weight ratio of the PPT drawn yarn (core component) and the spun cotton yarn (sheath component) (core component / sheath component) = 5
A 0/50 composite yarn was obtained. When the elastic properties of this composite yarn were evaluated, it was found to have sufficient elastic properties. Furthermore, this thread is sized (30 ° C), dried (85 ° C), warped, woven, relaxed and scoured with hot water at 97 ° C, 160 ° C.
After finishing and heat setting, the twill weave was woven with a twill weave density of 120 warp yarns / inch and weft yarn density of 90 yarns / inch.
As a result of the sensory evaluation of this twill fabric, the twill fabric was provided with a high degree of feeling and the feeling after elongation recovery was also good.

Examples 2 and 3 The same procedure as in Example 1 was repeated except that the ratio of the core component / the sheath component in Example 1 was changed as shown in Table 1.
It had excellent stretchability and a high degree of texture, and the texture after extension recovery was also good.

Examples 4 to 7 The procedure of Example 1 was repeated, except that the spun yarn was replaced with the long fibers or short fibers shown in Table 1 as a sheath component. The texture was good, and the texture was good after extension and recovery.

Example 8 Instead of the spun yarn in Example 1, the thickness is 20 μm and the width is 0.
The same procedure as in Example 1 was carried out except that a 3 mm polyethylene terephthalate slit yarn was used. As a result, the stretchability was excellent, the texture was high, and the texture after extension and recovery was good.

Examples 9 and 10 When carried out in the same manner as in Example 1 except that PPTs having different intrinsic viscosities were used, excellent stretchability was obtained.
It had a high degree of texture and had a good texture after elongation recovery.

Comparative Examples 1 and 2 Example 1 was repeated except that the ratio of the core component / the sheath component was changed.

Comparative Example 3 The same procedure as in Example 1 was carried out except that a drawn yarn made of 30d / 12f polyethylene terephthalate (PET) shown in Table 1 was used as the core component in place of the drawn yarn of PPT. did.

Table 1 shows the characteristic values and evaluation results of Examples 1 to 10 and Comparative Examples 1 to 3.

[0034]

[Table 1]

As is clear from Table 1, Examples 1-10
The yarn made of PPT which is the core yarn of the composite yarn of the present invention is
Since the tensile stress at 30% elongation is high and the recoverability is good, the woven fabric made of the composite yarn of the present invention had a good texture even after the elongation recovery.

On the other hand, the woven fabric made of the composite yarn of Comparative Example 1 in which the weight ratio of the core component / sheath component was less than 2/8, was not imparted with sufficient stretchability. The feeling was declining.

The woven fabric composed of the composite yarn of Comparative Example 2 in which the weight ratio of the core component / the sheath component exceeded 8/2 could not sufficiently express the texture of the fibers constituting the sheath component, and the initial texture and elongation The texture after recovery was poor.

Since the woven fabric made of the composite yarn of Comparative Example 3 using PET as the core component did not have sufficient stretchability, the texture after stretching and recovery of the woven fabric was lowered.

[0039]

The polyester composite yarn of the present invention can be easily processed with conventional equipment and can be manufactured at low cost.
It is economical and has excellent stretchability. Therefore, by using the polyester composite yarn of the present invention, it is possible to obtain a woven or knitted fabric that does not impair the feeling after elongation recovery by utilizing the stretchability.

Claims (1)

[Claims] 1. A yarn made of polyester having a limiting viscosity of 0.8 or more as a main component of polypropylene terephthalate as a core yarn, and a yarn made of a chemical fiber and / or a natural fiber as a sheath yarn around the core yarn. And place
A composite yarn characterized in that the core component and the sheath component are in a weight ratio of 2/8 to 8/2.