JPH11279881A - Antistatic double covered elastic yarn and stocking by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a covered elastic yarn having an improved antistatic property, feeling and fabric appearance and to provide stockings. SOLUTION: This double covered elastic yarn obtained by using an elastic yarn as a core yarn 1 and doubly coiling a synthetic yarn filament around the core yarn 1 comprises an under covering yarn 2 comprising filaments including an electroconductive inorganic powder, and having <=15 de fiber size and 1-15 filament count, and an upper covering yarn 3 comprising a crimped textured yarn having <=2 de single fiber size. The stockings are obtained by using the covered elastic yarn at least at one part of a leg part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic double covering elastic yarn and a stocking using the same. More specifically, the present invention relates to improvement of a covering elastic yarn having excellent antistatic properties. In particular, the present invention relates to a covering elastic yarn having antistatic properties, antistatic washing durability, texture, and fabric appearance, which is useful as a stocking material for socks.

[0002]

2. Description of the Related Art When stockings, skirts, pants and slips are worn, a phenomenon occurs in which they are attached to the feet due to the interaction due to their electrostatic charging. Therefore, in order to prevent this cling, knitting using antistatic long fibers containing a conductive polymer compound,
Post-processing in which a stocking knitting is followed by treatment with an antistatic component is known.

[0003] These methods can impart antistatic properties to stockings without impairing the strength and elongation, fabric appearance, color, and the like. Under a low humidity environment such as 40% RH or less, the antistatic effect is poor, and it is difficult to obtain a practically satisfactory antistatic effect. Further, when post-processing is performed using an antistatic component, there is a disadvantage that the antistatic component drops off when washing is repeated, thereby greatly reducing the antistatic effect and reducing the antistatic durability.

[0004] To solve this problem, Japanese Patent Laid-Open Publication No. Hei.
Japanese Patent Publication No. 902 proposes manufacturing a stocking from an antistatic filament yarn (hereinafter referred to as an antistatic yarn) containing a conductive inorganic powder.

[0005]

However, simply adding the antistatic yarn to the upper part of the stocking leg portion does not
Although wearing a skirt and slip has an antistatic effect, there is a problem in that while pants fashion is rapidly increasing and established, clinging occurs at the bottom of the stockings when wearing pants and the antistatic effect is insufficient. further,
Since the anti-static yarn has a basic knitted structure and is added to the structure, the feeling of the stocking becomes rough and hard, and softening is required.

On the other hand, as an antistatic yarn exhibiting high antistatic properties even under low humidity, a fiber (conjugate fiber) in which conductive inorganic powder such as conductive carbon black is locally dispersed in the fiber.
Is known and used for various applications as a mixed fiber or a mixed spun yarn. However, there is a disadvantage that the inorganic powder appears on the fiber surface and the color of the fiber itself is poor. Therefore, when added to the upper portion of the leg portion, the fabric appearance becomes particularly poor in color.

Accordingly, the present invention provides a covering elastic yarn and stocking which improves the above-mentioned disadvantages of the prior art and further improves antistatic properties, texture and fabric appearance.

[0008]

Means for Solving the Problems To solve the above problems, the antistatic double covering elastic yarn of the present invention has the following constitution. That is, in a double covering elastic yarn in which an elastic fiber is used as a core yarn and a synthetic fiber filament is wound twice around the core yarn, the lower winding yarn for covering contains a conductive inorganic powder, the yarn fineness is 15 denier or less, the number of filaments 1 to 15 filaments, wherein the upper winding yarn for covering is a crimped yarn having a single fiber fineness of 2 denier or less.

Further, the stocking of the present invention has the following configuration. That is, in a double covering elastic yarn in which an elastic fiber is used as a core yarn and a synthetic fiber filament is wound twice around the core yarn, the lower winding yarn for covering contains a conductive inorganic powder, the yarn fineness is 15 denier or less, the number of filaments A stocking comprising 1 to 15 filaments, wherein the upper winding yarn for covering is formed by using a covering elastic yarn which is a crimped yarn having a single fiber fineness of 2 denier or less for at least a part of a leg portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The covering elastic yarn of the present invention is such that the lower winding yarn for covering contains a conductive inorganic powder. If the conductive inorganic powder is not contained, the antistatic property of the stocking becomes insufficient.

As the conductive inorganic powder, conductive carbon black, metal powder such as copper, or conductive metal compound such as zinc oxide is preferably used.

[0012] As a mode of inclusion, a composite fiber in which such a conductive inorganic powder is partially localized in a fiber at a high concentration is preferable. As the conjugate fiber, a core-sheath type conjugate fiber having a single conductive layer dispersedly containing a conductive inorganic powder,
Bonded conjugate fibers and the like. The raw material polymer of the fiber containing the conductive inorganic powder is preferably a normal polyamide such as nylon 6 or nylon 66, or may be a polymer such as polyester or polyethylene.

The covering elastic yarn of the present invention has a yarn fineness of 15 denier or less, preferably 10 denier or less, of the lower winding yarn for covering. Yarn fineness is 15
If it exceeds denier, the texture of the stocking becomes coarse and hard.

The number of filaments of the lower winding yarn for covering is 1 to 15, preferably 1 to 10 filaments or less. If the number of filaments exceeds 15, there are problems such as lack of stability in yarn production, reduction in raw yarn strength, and lack of high-order workability such as yarn breakage during covering.

On the other hand, the upper winding yarn for covering used in the present invention is a crimped yarn having a single fiber fineness of 2 denier or less, preferably 1.5 denier or less.

If the single fiber fineness exceeds 2 denier, the texture of the stocking becomes coarse and hard. In addition, if the upper winding yarn for covering is not a crimped yarn, the texture of the stocking becomes rough and hard, and the covering ability is poor, and the color of the fiber itself, which is a defect of the antistatic yarn, is poor. There are problems such as deterioration of the fabric appearance.

In order to obtain a crimped yarn, known crimping methods such as false twisting, abrasion, and knit denit can be employed.

As the material of the upper winding for covering, polyamide, polyester, polyolefin, polyacryl and the like are used. Polyamide filaments excellent in dyeing properties, mechanical strength, friction resistance and the like are preferable, and polyamide filaments are more preferable. Among them, nylon 6 fiber and nylon 66 fiber which are particularly excellent in these properties are preferable.

The elastic yarn constituting the core yarn of the covering elastic yarn includes polyurethane elastic fibers, polyamide elastomer elastic fibers, polyester elastomer elastic fibers, natural rubber fibers, synthetic rubber fibers, polybutadiene fibers and the like. Among them, polyurethane-based elastic fibers and polyamide-elastomer-based elastic fibers are preferred for stocking in view of their elastic properties, thermal properties, durability and the like.

The fineness of the elastic fiber forming the core yarn of the covering elastic yarn varies depending on the application of the stocking and the setting of the tightening pressure. However, the yarn strength is insufficient and troubles such as breakage of the core yarn at the time of covering and knitting may occur. In addition to preventing the occurrence of this phenomenon, while ensuring sufficient elasticity and durability as stockings, from the viewpoint of preventing the tightening force from becoming too strong, resulting in a feeling of pressure, a decrease in transparency, and an increase in coarseness Generally, it is preferably about 8 to 70 denier, more preferably about 10 to 40 denier.

The stocking of the present invention uses the covering elastic yarn for at least a part of the leg portion.

The leg knitted fabric using the covering elastic yarn may be knitted by an ordinary method of knitting using a knitting machine having two or four yarns.

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

For example, in the case of a long stocking having a toe portion and a heel portion, the leg portion is a portion above a portion corresponding to the ankle immediately above the heel portion, and the upper end of the leg portion usually has a telescopic portion. An elastic belt portion is provided. Further, in the case of pantyhose, a leg portion corresponds to a portion between the toe portion and the panty portion.

[0025]

The following method was used to evaluate the leg portion of the stocking product in the following.

Texture: The stocking product was put on a human foot, and the soft feeling was relatively evaluated by the touch feeling of the inspector (5 persons).
：: good, △: slightly poor, ×: poor. It is shown with the same criteria as above.

Dough appearance: This was a relative evaluation by the naked eye of the inspector (five), and the results are shown based on the same criteria as the above tactile sensation.

Friction charging potential: According to JIS L 1094, the knitted fabric of the leg portion was rubbed ten times with a Tetron cloth, and the charging potential was measured in an atmosphere of 20 ° C. and 40% RH.

Clinging to a slip: Wearing sample stockings and Tetron tricot slips of various hem lengths, a step of 5 steps at a rate of 100 steps per minute (about 17 steps / 10 seconds) in a room at 20 ° C. and 30% RH. The experiment was performed three times to evaluate the clinging state of the slip after walking for about one minute.

Antistatic property: Tobacco ash adhering state after rubbing the leg knitted fabric 10 times with Tetron cloth at 20 ° C., 40
It was measured under an atmosphere of% RH. As a result, relative evaluation was performed based on the judgments of grades 1 to 5. However, grade 5 is a state in which ash does not adhere at all.

Example 1 A double core-sheath structure (core: sheath composite) composed of a conductive nylon 6 composition containing 35% of conductive carbon and non-conductive nylon 6 was used as an antistatic yarn of the lower winding yarn for covering. Antistatic nylon 6 (ratio = 5: 95)
Fiber 8 denier 3 filament, 20 denier 3 filament yarn was used. Its specific resistance is 1.2 × 10 ² Ωcm
Met. For comparison, non-conductive nylon 6 fiber, 8 denier, 3 filaments and 20 denier, 3 filaments were used. Its specific resistance was 1.5 × 10 ¹³ Ω · cm.

As the upper winding yarn for covering, a 50 denier 40 filament crimped yarn of nylon 66 fiber was used. For comparison, nylon 66 fiber 50 denier 2
A 4-filament crimped yarn and a nylon 66 fiber 50 denier 40 filament yarn were used.

Eight combinations of the nylon yarns shown in Table 1 were used for the covering winding yarn, a 15 denier polyurethane elastic yarn (spandex) was used as the core yarn, the draft was set to 3.2 times, and the number of twists was 600. / 1000t / m double covering, double covering elastic yarn (DCY)
Was manufactured.

Using the obtained DCY, a super four knitting machine (400 stitches) manufactured by Nagata Seiki Co., Ltd. is supplied to the yarn feeder of the knitting machine to form a pantyhose in which the legs are knitted only with DCY. The product was dyed, finished and set in a usual manner to obtain a pantyhose product.

Table 1 shows the results of evaluating the leg portion of the obtained pantyhose product.

As can be seen from the results shown in Table 2, when one DCY covering elastic yarn according to the present invention is used (Example 1) and when four DCY covering elastic yarns are used (Example 2), the charged voltage is 0 V or near. The value was extremely small, the effect was maintained even after washing, and remarkable results were obtained in preventing cling to slips. In addition, both softness and appearance of the fabric were excellent.

On the other hand, when the non-conductive fiber was used for the lower winding yarn for covering (Comparative Example 1), clinging to slips was observed, and the antistatic property was poor.

Further, even when the antistatic yarn is used as the lower winding yarn for covering, if the yarn fineness exceeds 15 denier (Comparative Example 2), no slip wrapping occurs and the antistatic effect is obtained, but the texture is improved. Is coarse and inferior in softness, and the color of the fiber itself, which is a defect of antistatic yarn, is poor.
The knitted fabric dyed in black had a staircase-like difference in shading, and the fabric appearance was inferior.

The upper winding yarn for covering has a single fiber fineness of 2
When the denier exceeds the denier (Comparative Example 3) or when the yarn is not a crimped yarn (Comparative Example 4), no slip wrapping occurs and there is an antistatic effect, but the texture is rough and the softness is inferior.

[0040]

[Table 1]

[Table 2]

[0041]

According to the covering elastic yarn of the present invention, an antistatic yarn is used as the lower winding yarn for covering and a crimped yarn having a single fiber fineness of 2 denier or less is used as the upper winding yarn, so that the covering elastic yarn having excellent antistatic properties is obtained. Can be obtained. Furthermore, in the case of hosiery such as stockings, hosiery excellent in antistatic property and antistatic washing durability, and excellent in texture and fabric appearance can be obtained.

[Brief description of the drawings]

FIG. 1 is a fiber cross-sectional view schematically illustrating an example of a double covering elastic yarn used in the present invention.

FIG. 2 is a fiber side view schematically illustrating an example of a double covering elastic yarn used in the present invention.

[Explanation of symbols]

 1: Core yarn 2: Lower winding yarn for covering 3: Upper winding yarn for covering

Claims (2)

[Claims] 1. A double covering elastic yarn comprising an elastic fiber as a core yarn and a synthetic fiber filament wound twice around the core yarn, wherein the lower winding yarn for covering contains a conductive inorganic powder and has a yarn fineness of 15 denier or less. A covering elastic yarn comprising a filament having 1 to 15 filaments, wherein the upper winding yarn for covering is a crimped yarn having a single fiber fineness of 2 denier or less. 2. A stocking characterized by using the covering elastic yarn according to claim 1 for at least a part of a leg portion.