JP2000248439A - Covered yarn and pantyhose or tights using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covered yarn which has not only good stretchability but also excellent appearance and touch and is suitable for pantyhose or tights. SOLUTION: This covered yarn comprises an elastic yarn having a dry heat setting property (PSD 120 deg.C) of >=80% at 120 deg.C as a core yarn and a polyester multi-filament yarn having a glass transition temperature of <=65 deg.C, a breaking elongation of >=30%, a breaking strength of >=3.0 g/d and an extension recovery of >=90% at an elongation of 20% as a winding yarn. The pantyhose uses the covered yarns. The covered yarn also comprises the above elastic yarn as a core yarn and a false-twisted polyester multi-filament yarn having a glass transition temperature of <=65 deg.C, a breaking elongation of >=30%, a breaking strength of >=3.0 g/d and a crimp fastness (CD) of >=15 as a winding yarn. The tights uses the covered yarns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a covered yarn using elastic fibers such as polyurethane as a core yarn,
More specifically, the present invention relates to a covered yarn useful as a material for socks, stockings, or underwear, and pantyhose or tights knitted using the covered yarn.

[0002]

2. Description of the Related Art Women's pantyhose includes covered yarn in which nylon filaments are wound around fine denier polyurethane elastic yarn, pantyhose in which nylon filaments are alternately knitted (hereinafter abbreviated as knitted pantyhose), and covered pantyhose. Pantyhose knitted with yarn only (hereinafter abbreviated as Zocchi pantyhose) is generally known. However, many such knitted pantyhose are knitted and designed based on the support force at the time of static wearing, and often have a drawback that they receive pressure when exercising and hinder the movement to some extent. In view of these drawbacks, recently, in the field of mixed knitting pantyhose, pantyhose using polyurethane and nylon singk covering yarn has been developed instead of nylon filament.

[0003] However, acid dyes usually used for nylon fibers are inferior to those using disperse dyes having a wide variety of dyes in color development, so that it is difficult to express clear colors, and it Have been forced to expand their products.

[0004] Nylon fibers have a unique slimy feeling and increase discomfort during sweating.

[0005] On the other hand, attempts have been made to reduce the discomfort during sweating by modifying the nylon itself and imparting moisture absorption, but this does not improve the basic sliminess.

[0006] On the other hand, in order to eliminate such properties of nylon fibers, attempts have been made in the past to use polyester filaments for winding or knitting yarns of covered yarn, but the texture of the product is hard and elasticity is high. However, there are drawbacks such as a shortage, and it has not yet been put to practical use. This is because the elasticity of the pantyhose is basically derived from the characteristics of the elastic yarn, which is the core yarn. However, during operation, the deformation rate of the covered yarn may reach 200%. It is thought to be due to the characteristics, particularly the low elongation recovery rate.

Furthermore, Japanese Patent Application Laid-Open No. H11-21732 discloses the use of a composite yarn using polytrimethylene terephthalate fiber as a polyester filament. Although it exhibited excellent recovery properties as compared with ordinary polyethylene terephthalate fibers, as described later, the stretchability of the product was extremely low, and the texture was too hard to be sufficient.

[0008]

SUMMARY OF THE INVENTION The present invention provides a polyurethane covered yarn using a polyester filament as a winding yarn in order to overcome the above-mentioned drawbacks of a covered yarn using a nylon fiber, It is, of course, to provide pantyhose having an excellent appearance and texture.

[0009]

That is, the present invention relates to a method for manufacturing a semiconductor device at 120.degree.
An elastic fiber having a dry heat setting property (PSD of 120 ° C.) of 80% or more is used as a core yarn, and a glass transition temperature of 65 is used as a wound yarn.
° C or less, elongation at break of 30% or more, and breaking strength of 3.0 g /
d, and a covered yarn comprising a polyester multifilament having an elongation recovery rate of 90% or more at 20% elongation, and a dry heat setting (PSD of 120 ° C.) at 120 ° C. of 80% or more. Polyester having an elastic fiber as a core yarn, a wound yarn having a glass transition temperature of 65 ° C. or less, a breaking elongation of 30% or more, a breaking strength of 3.0 g / d or more, and a crimp fastness (CD) of 15 or more. A covered yarn characterized by being composed of a multifilament false twisted yarn. More specifically, the covered yarn described above is characterized in that the main polymer component of the polyester filament is polytrimethylene terephthalate. Further, the present invention provides a pantyhose or tights wherein at least the leg portion is knitted only with the above-described covered yarn, and at least the leg portion alternately knits one of the above-described covered yarn and one cross-knitting yarn. Pantyhose or tights characterized by being made. Hereinafter, the present invention will be described in detail.

In order to obtain the pantyhose or tights excellent in elasticity, which is the desired object of the present invention, 120
An elastic fiber having a dry heat setting property at 80 ° C. (PSD 120 ° C.) of 80% or more is used as a core yarn, and a glass transition temperature of 6 is used as a wound yarn.
5 ° C or less, elongation at break of 30% or more, strength at break 3.0 g
/ D or more, and the elongation recovery at 20% elongation can be achieved by using a covered yarn made of a polyester multifilament of 90% or more.

When a flat yarn is used for the winding yarn, 2
It is a requirement that the elongation recovery rate at 0% elongation is 90% or more so as not to impair the stretchability of the covered yarn. If the recovery rate at 20% elongation is less than 90%, the wound yarn will not recover sufficiently when large deformation is applied to the covered yarn,
This is because the stretching performance decreases over time.

When a false twisted yarn is used as the wound yarn, it is preferable to evaluate the recoverability based on the crimp fastness in order to take into account the stretchability and elongation recovery by crimping. In this case, the crimp fastness is preferably 15 or more, and more preferably 19 or more, in order to obtain the stretch recovery required for the present invention. Below this value, when large deformation is applied to the covered yarn, the wound yarn will not recover sufficiently, and not only will the elasticity deteriorate over time, but also the stretchability will be lost in the subsequent process. The nature becomes high.

When the breaking elongation of the wound yarn is 30% or more and the breaking strength is 3.0 g / d or more, the basic mechanical properties of the covered yarn are maintained and the covering step itself is stably maintained. Is also a desirable requirement.

The fact that the polyester constituting the winding yarn has a glass transition temperature of 65 ° C. or lower is a requirement desired for easy dyeing using a disperse dye, and is particularly preferably 55 ° C. or lower. .

For such a winding yarn, a polyester fiber containing polytrimethylene terephthalate as a main component can be used.

As the polyester having polytrimethylene terephthalate as a main component, there is a polyester having terephthalic acid as a main acid component and trimethylene glycol as a main glycol component.
Further, a polyester in which part of the terephthalic acid component is replaced by another difunctional carboxylic acid component may be used, and / or part of the glycol component is replaced by the above-mentioned glycol or other diol component other than the main component. It may be polyester. Examples of the bifunctional carboxylic acid other than terephthalic acid used herein include, for example, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyethoxybenzoic acid, p-oxybenzoic acid, adipic acid ,
Examples thereof include aromatic, aliphatic and alicyclic bifunctional carboxylic acids such as sebacic acid and 1,4-cyclohexanedicarboxylic acid. Examples of the diol component other than the glycol include aliphatic, alicyclic, and aromatic diol compounds such as ethylene glycol, tetramethylene glycol, cyclohexane-1,4-dimethanol, neopentyl glycol bisphenol A, and bisphenol S. And polyoxyalkylene glycol. Furthermore, as long as the polyester is substantially linear, polycarboxylic acids such as trimellitic acid and pyromellitic acid, polyols such as glycerin, trimethylolpropane and pentaerythritol, 5-hydroxyisophthalic acid, and 3,5-dihydroxybenzoate Monomers having three or more functional ester-forming groups, such as acids, can be used. Further, a blend of the above-mentioned polymer or copolymer may be used.

In the present invention, the polyester fiber comprising the dicarboxylic acid component and the diol component is
If the trimethylene terephthalate component is not 50% or more of the whole, it will be difficult to obtain a material that is satisfactory in terms of elastic recovery. It is particularly preferred that at least 80 mol% of the repeating units are trimethylene terephthalate units.

Further, a small amount of other optional polymers, antioxidants, antistatic agents, dye improvers, dyes, pigments, matting agents, fluorescent brighteners, inert fine particles and other additives may be added to the polyester in small amounts. An agent may be contained. In particular, when adding inert fine particles, any of the external precipitation method and the internal precipitation method can be adopted.

In the production of the polyester fiber according to the present invention, ordinary spinning conditions can be adopted, but the spinning speed is 3
00-8000m / min, preferably 500-5000m
/ Min.

The spun yarn thus obtained may be wound once and subjected to a false twisting process, or may be subjected to a false twisting process after a stretching step. Further, the drawing may be performed continuously without being wound, and the obtained drawn yarn may be subjected to false twisting. Of course, the drawn yarn may be used as it is.

The fineness of the polyester yarn used is preferably 5 to 30 denier from the viewpoint of use as a wound yarn, and the single yarn fineness is preferably 3 denier or less from the viewpoint of texture.

Dry heat setting of the core yarn at 120 ° C. (PSD
(120 ° C.) of at least 80% is especially important for the covered yarns of the invention. If the dry heat setting at 120 ° C. (PSD 120 ° C.) of the core yarn is 80% or less, a temperature of 140 ° C. or more is required as a finishing set temperature for products, particularly pantyhose, and the like. In addition, the elongation recoverability of the wound yarn is significantly reduced, and the hand becomes extremely hard, so that the object of the present invention cannot be achieved.

For example, as described in Japanese Patent Application Laid-Open No. 11-21732, "the elasticity is not impaired at a normal processing temperature of about 190 ° C. in the pre-setting step at the time of dyeing".
On the other hand, the elasticity of such a core yarn is insufficient at a set temperature of about 140 ° C., and the product form cannot be maintained. For this reason, a higher temperature heat set is required, but in that case, as described above, since the stretch recovery of the wound yarn is reduced, the stretchability of the covered yarn is reduced, and the wound yarn is hardened. In addition, the texture of the product is significantly reduced.

As such a core yarn, for example, a fiber obtained by melt-spinning a thermoplastic elastomer can be used. As the thermoplastic elastomer, a thermoplastic polyurethane having a urethane bond or a heat-resistant polyurethane having an ester bond or an ether bond can be used. A plastic elastomer or the like can be used.

In the production of the elastic fiber for the core yarn in the present invention, the production conditions of a conventional method can be adopted, but the core yarn of the covering yarn is preferably 10 to 40 denier, and is preferably used for pantyhose or tights. Is 10
Those having 20 denier are preferred.

As the form of the covering yarn, any of a single covering yarn and a double covering yarn can be adopted.

In order to form a pantyhose or the like, a usual manufacturing method can be adopted. However, in order to use the covering yarn of the present invention to make a pantyhose excellent in stretchability and texture, the covered yarn of the present invention is used. Only,
It can be obtained by knitting at least the legs.

The braided pantyhose and the like are completed by pre-setting, sewing, dyeing, and heat setting as usual, but the dyeing is preferably performed at 100 ° C. or less, and the setting temperature is 140 ° C. It is necessary that the temperature be equal to or lower than 130 ° C. If the dyeing process is performed at 100 ° C. or higher, or the heat setting is performed at 140 ° C. or higher, the stretching property of the covering yarn of the present invention is lost, the texture becomes hard, and the performance as a product such as pantyhose is significantly reduced. .

By using the covering yarn of the present invention, good elasticity can be obtained. In particular, when the covering yarn is used for legs such as pantyhose, it is possible to obtain a product having both excellent elasticity and texture. it can.

[0030]

EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples. In addition, the evaluation method of various characteristics followed the following method.

Intrinsic viscosity: The polymer was dissolved in a mixed solvent of p-chlorophenol / tetrachloroethane = 3/1,
It was measured at 0 ° C.

Glass transition temperature: Differential scanning calorimeter (DS)
C) at a heating rate of 20 ° C./min.
Heat up to Then, after keeping at that temperature for 5 minutes, the sample is taken out and quenched in ice water. After the sample was dried at room temperature, the temperature was raised again by DSC at 20 ° C./min, and it was determined from the point where the heat capacity changed.

Fineness: According to the definition of JIS-L-1013, 24 hours in a room where the temperature and humidity are controlled at 20 ° C. and 65% RH.
After standing for a time, the measurement was performed.

Strong elongation: 24 hours in a room where the temperature and humidity are controlled at 20 ° C. and 65% RH according to the definition of JIS-L1013.
After standing for a time, the tensile strength and elongation were measured by a tensile tester.

20% elongation recovery rate: Based on the method of measuring the elongation modulus according to JIS-L1013,
After standing for 24 hours in a room where the temperature and humidity are controlled at 65 ° C. and 65% RH, the yarn length is 20 cm and the tensile speed is 2 c by a tensile tester
After 20% elongation at m / min, immediately remove the weight, return to the original gripping interval, and immediately pull at a pulling speed of 2 cm / min. Elastic recovery rate (%) = (L−L1) / L × 100 L: Elongation at 10% elongation (mm, here 20 mm) L1: Residual strain (mm) after the first tension

Crimp fastness: 5 m on sampled fiber
The treatment is performed in hot water at 98 ° C. for 15 minutes under a load of g / d. Take out this fiber and immediately 200mg
/ D, and measure the yarn length (L1). Next, after removing the load and drying in a hot air dryer at 60 ° C. for 15 minutes with no load, a load of 2 mg / d is applied, and the yarn length (L2) is measured. The crimp fastness is obtained by the following formula. Crimp fastness [%] = (1-L2 / L1) × 100

Heat setting property: A load of 1 mg per fiber fineness is applied, and L0 is taken as the sample length. Next, the sample is stretched twice and subjected to dry heat treatment at the specified temperature for 60 seconds in the stretched state. Here, the designated temperature is 120 ° C. for the PSD 120. After the treatment, after relaxing at room temperature for 1 hour, the length L1 is measured under a load of 1 mg / d. The set property is calculated using the following equation. PSD120 [%] = (L1−L0) × 100 / L0

(Experimental Examples 1, 2 and 4) Intrinsic viscosity 1.04 d
1 / g, a glass transition temperature of 50 ° C., and a polytrimethylene terephthalate resin having a titanium dioxide content of 0.3% by weight were extruded with an extruder and melt-spun at a spinning temperature of 250 ° C. and a winding speed of 1000 m / min.

The obtained undrawn yarn is heated at a hot roller temperature of 6
Stretching at 0 ° C and hot plate temperature of 130 ° C, 15
d, 5 filament drawn yarn was obtained. Table 1 shows the properties of this drawn yarn as wound yarn 1. The obtained drawn yarn had excellent stretch recovery.

Further, the two undrawn yarns were subjected to false twisting at a draw ratio of 1.075 to obtain a false twisted yarn at the time of the above stretching. Table 1 shows the properties of this false twisted yarn as winding yarn 2. The obtained false-twisted yarn was excellent in the fastness to winding and had excellent stretchability.

On the other hand, the characteristics are shown in Table 1 with the characteristics of the nylon 6 flat yarn as the winding yarn 4.

(Experimental Examples 3 and 5) As in Example 1, the spinning temperature was 262 ° C. and the winding speed was 3200 m / min.
A zero filament POY was prepared. This POY was false-twisted at a draw ratio of 1.23 times to obtain a false-twisted yarn.
The properties of the false twisted yarn are shown in Table 1 as a winding yarn 3. The obtained false-twisted yarn had extremely good fastness to winding and had excellent elasticity.

On the other hand, the properties of the nylon 6 false twisted yarn are shown in Table 1 with the characteristics of the wound yarn 5.

[0044]

[Table 1] (Examples 1, 2 and Comparative Examples 1 to 4) A melt-type polyurethane elastic yarn (core yarn 1, 18d) manufactured by Toyobo Co., Ltd. was used as a core yarn (core yarn 1), and winding yarn 1 was used as a winding yarn. Then, covering was performed under the conditions of a spindle rotation number of 20,000 rpm, a twist number of 1600 T / M, and a total draft of 3.0 to obtain a single covered yarn. This was designated as CY1.

Similarly, a dry type polyurethane elastic yarn (core yarn 2, 20d) manufactured by Toyobo Co., Ltd. was used as the core yarn (core yarn 2), the winding yarn 1 was used as the winding yarn, and the spindle rotation speed was changed. Covering was performed under the conditions of 20000 rpm, 1900 T / M twist, and a total draft of 3.3 to obtain a single covered yarn. This was designated as CY2.

Further, covering was performed with a combination of the winding yarn 4 and the core yarn 1 to obtain a single covered yarn. This was designated as CY3.

The characteristics of the core yarns 1 and 2 are shown in Table 2 below.
Table 3 shows the properties of CY6.

Further, the winding yarn 3 and a dry type polyurethane elastic yarn (core yarn 3, 30d) (core yarn 3) manufactured by Toyobo Co., Ltd.
To produce a single covering yarn CY4 covered under the conditions of a spindle rotation number of 8000 rpm, a twist number of 650 T / M, and a total draft of 3.7.
In addition, covering was performed with a combination of the winding yarn 5 and the core yarn 3 to obtain a single covered yarn. This was designated as CY5.

Further, covering was performed with the combination of the wound yarn 3 and the core yarn 1 to obtain a single covered yarn. This was designated as CY6. A single covered yarn was produced by covering with the combination of the winding yarn 2 and the core yarn 1, and the obtained covered yarn was soft in elasticity but poor in recovery.

The properties of the core yarn 3 are shown in Table 2 below.
The properties of Y4 and Y5 are shown in Table 3, respectively. It is clear that good elasticity and recoverability can be obtained with the covered yarn having the configuration of the present invention. In addition, it is clear that setting at a low temperature is possible from the heat setting property of the core yarn.

[0051]

[Table 2]

[Table 3] (Example 3, Comparative Examples 5 and 6) Covering yarn CY1
In each of CY3, S-twisted yarn and Z-twisted yarn were alternately arranged to knit the leg portion of the Zokki pantyhose.

Covered yarns CY4 and CY5 were knitted for the panty part, respectively.

In accordance with the combinations shown in Table 4, the zocchi pantyhose was sewn according to a conventional method, dyed at 100 ° C.
The final set was finished at ℃ to obtain pantyhose. The obtained pantyhose is PS1
The characteristics are shown in Table 4 as No. 3. In the pantyhose of the configuration of the present invention, an appropriate fit was obtained, and the texture was dry and excellent.

Example 4 Tights were knitted using only the covered yarn CY6, and then dyed at 100 ° C., and then final set at 105 ° C. to obtain tights. The tights obtained had a soft feeling of wearing and moderate tightening.

[0055]

According to the present invention, excellent texture and stretchability can be obtained by a covered yarn using an elastic yarn having a specific heat setting property as a core yarn and a polyester filament having excellent recovery properties as a winding yarn. In addition, in a pantyhose or the like having a leg portion knitted only with the covered yarn of the present invention, it is possible to provide a pantyhose or stocking that enhances the elasticity of the product and is excellent in wearing feeling. I made it.

Claims (7)

[Claims] 1. A dry heat setting property at 120 ° C. (PSD120
C) is 80% or more as the core yarn, and the glass transition temperature of the wound yarn is 65 ° C or less, the breaking elongation is 30% or more,
A covered yarn comprising a polyester multifilament having a breaking strength of 3.0 g / d or more and an elongation recovery at 20% elongation of 90% or more. 2. Dry heat setting at 120 ° C. (PSD12)
(0 ° C) is 80% or more as a core yarn, and the wound yarn has a glass transition temperature of 65 ° C or less, an elongation at break of 30% or more, a breaking strength of 3.0 g / d or more, and a crimp fastness. A covered yarn comprising a polyester multifilament false twisted yarn having a degree (CD) of 15 or more. 3. The covered yarn according to claim 1, wherein the main component of the polymer constituting the polyester filament is polytrimethylene terephthalate. 4. A panty stocking wherein at least the leg portion is knitted only with the covered yarn according to claim 1. 5. A panty stocking wherein at least the leg portion is formed by alternately knitting one of the covered yarn and the knitting yarn according to claim 1. 6. Tights characterized in that at least the leg portion is knitted only with the covered yarn according to claim 2. 7. Tights characterized in that at least the leg portion is formed by alternately knitting one of the covered yarn and the knitting yarn according to claim 2.