JP2000273732A - Covered elastic yarn composed of polyester fiber and stocking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a covered elastic yarn having excellent feeling, appearance of fabric, durability and wash fastness and suitable for stockings, etc., by using an elastic fiber as a core yarn and winding a specific polyester fiber around the core yarn. SOLUTION: The objective covered elastic yarn is produced by using an elastic fiber such as polyurethane yarn as the core yarn and winding a polybutylene terephthalate fiber having a single fiber fineness of <=2.0 d, a Young's modulus of <=45 g/d and a strength of >=3.5 g/d and/or a polypropylene terephthalate fiber having a single fiber fineness of <=2.0 d, a Young's modulus of <=35 g/d and a strength of >=3.5 g/d around the core yarn. Preferably, the winding number (Y) of the covered elastic yarn satisfies the inequality 9,000/D1/2 >=Y>=5,000.D1/2 (D is the total denier of the polyester fiber) and stockings are produced by using the covered elastic yarn as at least a part of the leg part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a covering elastic yarn made of polyester fiber and a stocking. In particular, the present invention relates to covering elastic yarns and stockings that are useful as sock materials such as stockings and socks and have a texture, a fabric appearance, durability, and washing fastness.

[0002]

2. Description of the Related Art In recent years, stocking has been remarkably changed, and a support type using a covering elastic yarn obtained by winding nylon around a polyurethane elastic yarn has become mainstream from a conventional one using a wooly nylon yarn. This support type has been well received in the market for its excellent fit, stretch recovery characteristics and durability.

The characteristics required for the pantyhose are fit and texture for the purpose of improving comfort when worn, and fabric appearance, transparency and color development are desired from the viewpoint of aesthetics. From the viewpoint of color fastness (weather resistance) and durability after washing are regarded as important.

[0004] Polyethylene terephthalate (hereinafter PE)
Fibers (abbreviated as T) have excellent physical and chemical properties, and are superior in light resistance, washing fastness, and dimensional stability to polyamide fibers, and are used in various fields such as clothing and industrial materials. However, since PET fibers generally have a higher Young's modulus than polyamide fibers or the like, knitted stockings have a hard texture or are inferior in normal-pressure dyeing properties, and have not been developed for stocking applications.

On the other hand, among polyester fibers, polybutylene terephthalate fiber and polypropylene terephthalate fiber have low Young's modulus, are chemically stable, and have characteristics suitable for clothing.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a covering elastic yarn made of polyester fiber which is excellent in texture, appearance of fabric, durability and washing fastness in view of the conventional disadvantages. Things.

[0007]

In order to solve the above-mentioned problems, a covering elastic yarn comprising a polyester-based fiber of the present invention mainly has the following constitution. That is, in a covering elastic yarn obtained by winding a polyester-based fiber around an elastic fiber as a core yarn, the polyester-based fiber is a polybutylene terephthalate fiber and / or a polypropylene terephthalate fiber. It is.

The stocking of the present invention mainly has the following configuration. That is, it is a stocking using the covering elastic yarn for at least a part of the leg portion.

[0009]

DETAILED DESCRIPTION OF THE INVENTION Polybutylene terephthalate (hereinafter abbreviated as PBT) is a polyester obtained by using terephthalic acid as a main acid component and 1,4 butanediol as a main glycol component. However, 20 mol%
It may contain another copolymer component capable of forming an ester bond in the following ratio. Examples of the copolymerizable acid component include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimeric acid, and sebacic acid. On the other hand, copolymerizable glycol components include, for example, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol and the like.

[0010] The limiting viscosity of PBT or PPT used in the present invention is PBT per 10 ml of orthochlorophenol.
Alternatively, it refers to a value obtained by dissolving 0.10 g of a PPT sample and measuring the temperature at 25 ° C. using an Ostwald viscometer.

The intrinsic viscosity of PBT used in the present invention is preferably 0.7 to 2.0. By setting the intrinsic viscosity to such a preferable range, it is possible to stably spin without fineness unevenness and yarn breakage during spinning, and the obtained fiber satisfies practical aspects such as tensile strength and bending wear resistance. There is good meterability of a gear pump etc. from the point of melt viscosity, it can be spun stably, and the texture of the obtained fiber tends to be soft and not hard, especially preferred for stocking applications where a soft feeling is required .

Polypropylene terephthalate (hereinafter referred to as P
PT) and terephthalic acid as the main acid component,
Polyester obtained by using 1,3 propanediol as a main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol% or less. As a copolymerizable acid component,
For example, dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid can be mentioned. On the other hand, copolymerizable glycol components include, for example, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol and the like.

As necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives, coloring pigments, etc. as antioxidants are added to these PBT fibers and PPT fibers. Can be.

The intrinsic viscosity of PPT used in the present invention is 0.5
It is preferable that the number is 1.2. By setting the intrinsic viscosity to 0.5 or more, the fiber can be stably spun without fineness unevenness and yarn breakage during spinning, and the obtained fiber satisfies practical aspects such as tensile strength and bending wear resistance. It is. In addition, when the intrinsic viscosity is 1.2 or less, the meterability of a gear pump or the like is good in terms of melt viscosity, stable spinning can be performed, and the texture of the obtained fiber tends to be soft and not hard, and particularly soft. It is preferred for stocking applications where a sense is required. More preferably, the intrinsic viscosity of PPT is 0.8 to
1.0.

[0015] The PBT fiber and the PPT fiber used in the present invention are produced by a melt spinning method which is a usual spinning method. The spinning method is a normal spin-drawing method after melt spinning, cooling, and oiling, and a spinning speed of 1000 m / m.
A direct spinning drawing method in which the film is taken up in minutes or more and then drawn and wound without being wound once, or a high-speed spinning method in which the film is spun at a high speed of 3000 m / min or more and wound up without drawing.

The cross-sectional shape of a single fiber of the PBT fiber and the PPT fiber used in the present invention is not particularly limited, but may be a non-circular shape such as a flat, four-lobe, three-lobe, or lens type in addition to a normal round cross-section. Further, the form of the PBT fiber and the PPT fiber used in the present invention is not particularly limited, but may be a false twisted yarn in addition to a normal raw yarn.

The PBT fiber used in the present invention has a single fiber fineness of 2.0 d or less, a Young's modulus of 45 g / d or less, further 25 to 45 g / d, and a strength of 3.5 g / d or more, and further 4.0 g. / D or more. When the single fiber fineness of the PBT fiber is 2.0 denier or less, the texture of the resulting stocking can be excellent, and the Young's modulus is 45%.
When the weight is not more than g / d, the texture of the obtained stocking can be softened, and when the strength is 3.5 g / d or more, the durability of the obtained stocking can be excellent.

The PPT fiber used in the present invention has a single fiber fineness of 2.0 d or less, a Young's modulus of 35 g / d or less, further 20 to 40 g / d, and a strength of 3.5 g / d or more, and further 4.0 g. / D or more. When the single fiber fineness of the PPT fiber is 2.0 denier or less, the texture of the resulting stocking can be excellent, and the Young's modulus is 35%.
When the g / d is not more than g / d, the texture of the obtained stocking can be excellent, and when the strength is 3.5 g / d or more, the durability of the obtained stocking can be excellent.

Further, the number of times of covering winding of the covering elastic yarn of the present invention preferably satisfies the following inequality. 9000 / D ^1/2 ≧ Y ≧ 5000 · D ^1/2 (where D is the fineness of polybutylene terephthalate) When the number of times of covering winding is within such a preferable range, the fit of the stockings obtained is excellent, and uneven covering coverage is obtained. The resulting stocking is hard to be caught and is excellent in durability, unevenness is hardly generated on the surface and excellent in softness, and the fabric appearance can be excellent.

The covering elastic yarn of the present invention may be a single covering elastic yarn (SCY) or a double covering elastic yarn (DCY). The single covering elastic yarn is a composite elastic yarn obtained by winding a covering yarn around an elastic fiber yarn. The double covering elastic yarn is a composite elastic yarn obtained by winding a covering yarn around the elastic fiber yarn in different winding directions.

As the elastic yarn forming the core yarn of the covering elastic yarn, there are usually polyurethane elastic fibers, polyamide elastomer elastic fibers, polyester elastomer elastic fibers, natural rubber fibers, synthetic rubber fibers, butadiene fibers and the like. Among them, polyurethane-based elastic fibers and polyamide-based elastomeric elastic fibers are preferred for stocking because of their elastic properties, thermal properties, durability and the like.

The fineness of these elastic fibers varies depending on the application of the stocking and the setting of the tightening pressure.
It may be in the range of about 70 denier. Particularly preferred is 10 to 40 denier. Within such a preferred range, the yarn strength is sufficient, troubles such as breakage of the core yarn during covering and knitting are unlikely to occur, and the stretchability and durability as stockings are sufficient, but the tightening force does not become too strong. , Transparency can be maintained and there is no rough or hard feeling.

The stockings of the present invention can be made in two or four
Using a yarn feeding knitting machine, a method of knitting only with the covering elastic yarn of the present invention, knitting alternately the elastic yarn covered with a different material such as polyamide fiber and the above-described covering elastic yarn of the present invention alternately The knitting method may be used. In any case, the stocking of the present invention only needs to use the above-described covering elastic yarn of the present invention for at least a part of the leg portion.

The stockings targeted by the present invention are stockings products represented by pantyhose, long stockings, short stockings, and tights.

[0025]

The following method was used to evaluate the leg portion of the stocking product in the following. (1) Texture (soft feeling, dry feeling) Put stocking products on human foot, and inspector (5 persons)
The soft feeling and the dry feeling of the texture were relatively evaluated by the tactile sensation, and the results were shown in four stages: ◎: extremely good, ：: good, Δ: slightly poor, ×: poor. (2) Fit The evaluation was made by a wearing test in which subjects (five persons) were worn for 8 hours a day for 3 days, and the results are shown by the same standard as the above-mentioned texture. (3) Burst Strength Burst strength was measured by a rupture strength test method using a JIS P8131 Mullen high-pressure tester. (4) Scratch Strength The stocking product was rubbed 6000 times on a nylon taffeta in the well direction, and the stocking product after rubbing was compared in terms of tearing. As a result, ◎: no damage,
：: No damage (about pilling), Δ: damage (perforated state), ×: damage (conducted state). (5) Washing fastness Measured according to JIS L 0844 A-2 method. (6) Appearance of the fabric The relative appearance was visually evaluated by the inspectors (five), and the results are shown by the same standard as the above-mentioned texture.

Example 1 A PBT pellet having an intrinsic viscosity [η] of 0.86 was spun at a spinning temperature of 260 ° C. at a spinning take-off speed of 1500 m / min. The obtained undrawn yarn is stretched at a first HR temperature of 90 ° C. and a second HR temperature of 120 ° C. with an elongation of 40 to 45% using a normal hot roll (HR) drawing machine.
And stretched so that it becomes 10 denier and 5 filament P
A BT fiber was obtained. This fiber is used as a covering yarn, and
An 8-denier polyurethane elastic yarn “Operon” manufactured by Toray Dupont Co., Ltd.) is used as the core yarn, the draft is set to 2.6 times, the single covering is performed at a covering twist number of 2000 t / m, and the single covering elastic yarn (SCY) is formed. Obtained.
The characteristics of this covering elastic yarn and the fabric obtained by knitting the legs in plain with a sock knitting machine with 400 needles and a four-neck yarn feeder are subjected to high-pressure dyeing with a disperse dye, and finishing and patterning. Table 1 shows the characteristic evaluation results of the stocking products obtained by setting. The pantyhose obtained in Example 1 was excellent in all of softness, dry feeling, burst strength, abrasion test, washing fastness, and fabric appearance.

[0027]

[Table 1]

Example 2 A PPT pellet having an intrinsic viscosity [η] of 0.90 was spun at a spinning temperature of 260 ° C. at a spinning take-off speed of 1500 m / min. The obtained undrawn yarn is stretched at a first HR temperature of 90 ° C. and a second HR temperature of 120 ° C. with an elongation of 40 to 45% using a normal hot roll (HR) drawing machine.
And stretched so that it becomes 10 denier and 5 filament P
PT fiber was obtained. This fiber is used as a covering yarn, and
An 8-denier polyurethane elastic yarn "Operon" (registered trademark, manufactured by Toray Dupont Co., Ltd.) is used as a core yarn, and a draft 2.
It is set to 6 times, and single covering is performed with a covering twist number of 2000 t / m, and a single covering elastic yarn (SC
Y) was obtained. The characteristics of this covering elastic yarn and the fabric obtained by knitting the legs in plain with a sock knitting machine with 400 needles and a four-neck yarn feeder are subjected to high-pressure dyeing with a disperse dye, and finishing and patterning. Table 1 also shows the characteristic evaluation results of the set stocking products. The pantyhose obtained in Example 2 was excellent in all of softness, dry feeling, burst strength, abrasion test, washing fastness, and fabric appearance.

(Comparative Example) P having an intrinsic viscosity [η] of 0.68
The ET pellet was spun at a spinning temperature of 290 ° C. at a spinning take-off speed of 1500 m / min. The obtained undrawn yarn is drawn using a normal hot roll (HR) drawing machine so as to have a first HR temperature of 90 ° C., a second HR temperature of 130 ° C. and an elongation of 40 to 45%, and to obtain 10 denier 5 filaments. PE
A T fiber was obtained. This fiber is used as a covering yarn, and
A denier polyurethane elastic yarn “Operon” (registered trademark, manufactured by Toray Dupont Co., Ltd.) is used as a core yarn, and a draft 2.
It is set to 6 times, and single covering is performed with a covering twist number of 2000 t / m, and a single covering elastic yarn (SC
Y) was obtained. The characteristics of this covering elastic yarn and the fabric obtained by knitting the legs in plain with a sock knitting machine with 400 needles and a four-neck yarn feeder are subjected to high-pressure dyeing with a disperse dye, and finishing and patterning. Table 1 also shows the characteristic evaluation results of the set stocking products. The pantyhose obtained in the comparative example was inferior in softness, dryness, abrasion test and fabric appearance.

[0030]

According to the present invention, it is possible to obtain a covering elastic yarn having a feeling, a fabric appearance, durability and washing fastness, which is useful as a stocking material or sock material for socks.

Claims (5)

[Claims] 1. A covering elastic yarn comprising an elastic fiber as a core yarn and a polyester fiber wound therearound, wherein the polyester fiber is a polybutylene terephthalate fiber and / or a polypropylene terephthalate fiber. Covering elastic yarn. 2. The stocking according to claim 1, wherein the polybutylene terephthalate fiber has a single fiber fineness of 2.0 d or less, a Young's modulus of 45 g / d or less, and a strength of 3.5 g / d or more. 3. The stocking according to claim 1, wherein the polypropylene terephthalate fiber has a single fiber fineness of 2.0 d or less, a Young's modulus of 35 g / d or less, and a strength of 3.5 g / d or more. 4. The number of windings of the covering elastic yarn (Y)
2. The covering elastic yarn according to claim 1, wherein the following inequality is satisfied. 9000 / D ^1/2 ≧ Y ≧ 5000 · D ^1/2 (where D: total fineness of polyester fiber) 5. A stocking using the covering elastic yarn according to claim 1 for at least a part of a leg portion.