JPH1121732A - Conjugate yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject yarn, capable of being knitted into a texture excellent both in outer appearance and feel of touch, and useful for socks, stockings, underwear or the like by compositing a polytrimethylene terephthalate fiber with an elastic fiber. SOLUTION: This conjugate yarn is obtained by compositing (A) a fiber of polytrimethylene terephthalate, which is synthesized by reacting terephthalic acid or its functional derivative with trimethylene glycol or its functional derivative in the presence of a catalyst, with (B) an elastic fiber, e.g. polyurethane-, polyester-, or polyether esterbased fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite yarn represented by a coated elastic yarn formed by winding an inelastic fiber around an elastic fiber such as polyurethane, and more particularly, useful as a material for socks, stockings or underwear. The present invention relates to a complex yarn.

[0002]

2. Description of the Related Art Nylon or the like is wound around an elastic fiber such as polyurethane (covering), so that it is widely used to cover the drawbacks of elastic yarn, such as dyeing characteristics, mechanical strength, and friction resistance. I have. This covered elastic yarn is generally manufactured by winding a nylon covering yarn in a single (single covering) or double (double covering) around a 20 to 70 denier elastic yarn, and is used for socks, stockings, underwear and the like. Is widely used in

[0003] The appearance and texture of socks, stockings, underwear and the like are greatly affected by the physical properties of the coated yarn in the coated elastic yarn, and a satisfactory appearance and texture have not yet been obtained. Various attempts have been made to improve the physical properties of the covering yarn. For example, there is a coating yarn in which the torque of the coating elastic yarn is lowered by paying attention to the Young's modulus of the nylon fiber of the coating yarn (see Japanese Patent Application Laid-Open No. 62-263339), but the appearance and texture are not sufficiently satisfied.

[0004]

SUMMARY OF THE INVENTION The present invention provides a sock,
An object of the present invention is to provide a composite yarn typified by a coated elastic yarn obtained by winding an inelastic fiber around an elastic fiber such as polyurethane, which has a good appearance and feel that can be used in stockings and underwear.

[0005]

Means for Solving the Problems The present inventors have conducted various studies on a coating fiber having a good appearance and texture as a material for conventional socks, stockings or underwear, and as a result, have obtained the following findings. The present invention has been reached.

That is, the cause of the poor appearance and texture of the product is that the resilience (retraction force) and the resilience of the elastic fiber and the inelastic fiber after knitting in the knitting process and the recovery are too different. This is because the elastic yarn has a high elongation, irregular stitches caused by uneven knitting tension caused by high instantaneous recovery properties, if only elastic fibers, return to the original by its excellent elastic force, uniform Although it can be a stitch, the covering yarn with a high initial tensile resistance covering the elastic yarn presses the elastic fiber to be recovered, so it is not balanced and leaves irregular stitches, The consequences of inducing defects. That is, the inventors have found that it is based on the difference in physical properties between the elastic fiber and the coated yarn.

[0007] The present inventors do not solve such a drawback,
As a result of intensive studies, the present invention has been completed. That is, the present invention is a composite yarn comprising a composite of polytrimethylene terephthalate fiber and elastic fiber. Hereinafter, the present invention will be described in detail.

In the present invention, the polytrimethylene terephthalate fiber is a polyester fiber having a polytrimethylene terephthalate unit as a main repeating unit, and the trimethylene terephthalate unit contains about 50 mol% or more, preferably 70 mol% or more. Preferably 80
Mol% or more, particularly preferably 90 mol% or more. Therefore, the total amount of the other acid component and / or glycol component as the third component is within a range of about 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, and particularly preferably 10 mol% or less. And polytrimethylene terephthalate.

Polytrimethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof and trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions.
In this synthesis process, an appropriate one or two or more third components may be added to form a copolymerized polyester,
Further, after separately synthesizing polyester or nylon other than polytrimethylene terephthalate such as polyethylene terephthalate and nylon and polytrimethylene terephthalate, these may be blended or composite-spun (sheath core, side-by-side, etc.).

The third components to be added include aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexane dicarboxylic acid, etc.), aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.). ), Aliphatic glycols (ethylene glycol, 1,2
-Propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanediol, etc.), aromatic dioxy compounds (hydroquinone, bisphenol A, etc.), aliphatic glycols containing aromatic [1,
4-bis (β-hydroxyethoxy) benzene, etc.], polyether glycol (polyethylene glycol, polypropylene glycol, etc.), aliphatic oxycarboxylic acid (ω-oxycaproic acid, etc.), aromatic oxycarboxylic acid (P-oxybenzoic acid) Etc.). Also, 1
Compounds having one or more ester-forming functional groups (such as benzoic acid or glycerin) can also be used in a range where the polymer is substantially linear.

Further, polytrimethylene terephthalate includes a matting agent such as titanium dioxide, a stabilizer such as phosphoric acid, an ultraviolet absorber such as a hydroxybenzophenone derivative, a crystallization nucleating agent such as talc, a lubricating agent such as aerosil, An antioxidant such as a hindered phenol derivative, a flame retardant, an antistatic agent, a pigment, a fluorescent brightener, an infrared absorber, an antifoaming agent, and the like may be contained.

In the present invention, the polytrimethylene terephthalate fiber is spun at a winding speed of about 1500 m / min to obtain an undrawn yarn, and then is twisted at a rate of about 2 to 3.5 times. -Direct-rolling method directly connected to the twisting process,
Any method such as a high-speed spinning method (spin draw or spin take-up method) with a winding speed of 5000 m / min or more may be adopted.

The form of the fiber may be a long fiber or a short fiber, may be uniform or thick in the length direction, and may be round, triangular, L-shaped, T-shaped or Y-shaped in cross section. , W
It may be a polygonal type such as a mold, an eight-leaf type, a flat shape, a dogbone type, etc., a multi-leaf type, a hollow type or an irregular shape. Further, as the form of the yarn, a spun yarn such as a ring spun yarn and an open-end spun yarn, a multifilament yarn (including an ultrafine yarn) having a single yarn denier of about 0.1 to 5 denier, a sweet twisted yarn to a strong twisted yarn,
Mixed fiber yarns, false twisted yarns (including drawn false twisted yarns of POY), fluid jet processed yarns such as so-called Taslan processed yarns, and the like.

Incidentally, within a range not to impair the object of the present invention,
Usually 30% by weight or less of other fibers such as wool and other fibers such as wool are blended (silospan, silofil, etc.), interlaced mixed fibers (different shrinkage mixed fibers with high shrinkage yarns, etc.), intertwist, Mixed false twist (elongation difference false twist, etc.) and two-feed tanran processing may be used.

In the present invention, as the elastic fiber, it is possible to use polyurethane-based, polyester-based, polyetherester-based, etc. elastic fibers, for example, ordinary polyurethane-based elastic fibers obtained by dry spinning or melt spinning. Can be used, and the polymer and the spinning method are not particularly limited. The denier of the fiber is preferably in the range of 20 to 70. It has a breaking elongation of 400% to 1000% and has excellent stretchability.
It is preferred that the elasticity be maintained at around 90 ° C. For example, it comprises a copolymer obtained from a copolymerized polyalkylene ether diol, an aromatic diisocyanate mainly composed of 4,4 ′ diphenylmethane diisocyanate and a difunctional diamine, and a polyurethane having a number average molecular weight of 6,000 to 9,500 in a urethane part and a urea part in the polyurethane. Number average molecular weight of 650 to 950 and 30
Examples include polyurethane elastic fibers having a 0% modulus of 0.20 g / denier or less, but the present invention is not limited thereto.

Means for combining the elastic fiber and the polytrimethylene terephthalate fiber include a single (single covering) or double (double covering) winding of the elastic fiber with a polytrimethylene terephthalate fiber, or a combination of the two with a fluid. Examples include entangled yarns that have been subjected to injection processing. Hereinafter, the present invention will be described in more detail using examples and the like.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

<Method for producing polytrimethylene terephthalate fiber> ηsp
The polytrimethylene terephthalate of /c=0.8 is spun at a spinning temperature of 265 ° C. and a spinning speed of 1200 m / min to obtain an undrawn yarn, then a hot roll temperature of 60 ° C., a hot plate temperature of 140 ° C., and a draw ratio of 3 times. , Stretching speed 800m
/ M / min to obtain a drawn yarn of 15d / 5f. The strength and elongation of the drawn yarn, elastic modulus and elastic recovery at 10% elongation are as follows:
They were 3.2 g / d, 46%, 30 g / d and 98%, respectively.

The elastic recovery at 10% elongation was as follows: the sample was subjected to an initial load of 0.01 g / d, and was stretched at a constant rate of 20% elongation per minute to reach an elongation of 10%. By the way, on the contrary, it contracts at the same speed, and draws a stress-strain curve.
Assuming that the residual elongation when the stress is reduced to 0.01 g / d, which is equal to the initial load, during contraction is L, it is a value calculated by the following equation. Elastic recovery rate at 10% elongation = [(10−L) / 10] ×
100 (%)

Example 1 Polytrimethylene terephthalate fiber 15d / 5f obtained by the above-mentioned production method was used as a covering yarn, and a polyurethane fiber (available from Asahi Kasei Corporation: trade name)
While stretching 20 denier 3 filaments 3.2 times,
A double covering yarn (2400 T / m in the lower twist Z direction, 2200 T / m in the upper twist S direction) was prepared. Subsequently, the base of the sock is knitted with a sock knitting machine of 3.5 inches in diameter and 360 needles using the yarn, and the texture of the sock obtained by dyeing and finishing in a conventional manner is soft. The surface was very high quality with almost no surface irregularities and no disturbance of loops.

(Example 2) A knitted fabric was prepared in the same manner as in Example 1 except that a single covering (1500 T / m in the Z twist direction) was formed using 40 denier 4 filaments as the polyurethane fiber. As a result of evaluating the obtained knitted fabric, the texture and the appearance were excellent as in Example 1.

Comparative Example 1 A knitted fabric was prepared and obtained in the same manner as in Example 1 except that nylon 66 (Leona, trade name, manufactured by Asahi Kasei Corporation) 15d / 5f was used instead of the polytrimethylene terephthalate fiber. The result of evaluating the knitted fabric is
Surface irregularities and loop disturbance were scattered, and the texture was harder than that of Example 1.

(Comparative Example 2) A knitted fabric was prepared in the same manner as in Example 2 except that 50d / 17f nylon 66 was used instead of the polytrimethylene terephthalate fiber, and the obtained knitted fabric was evaluated. Needle streaks, surface irregularities, and disorder of the loop were scattered, and the texture was harder than that of Example 2.

[0023]

As described above, with the composite yarn of the present invention, a knitted fabric excellent in both appearance and texture can be obtained as compared with a conventional yarn using nylon yarn.

Claims (1)

[Claims] 1. A composite yarn comprising a composite of polytrimethylene terephthalate fiber and elastic fiber.