JPH06346332A - Sheath-core conjugate spun yarn - Google Patents

Abstract

PURPOSE:To obtain a sheath-core conjugate spun yarn exhibiting excellent color uniformity, feeling and moisture absorption and having high functionality and beautiful appearance by using an ultra-high tenacity multifilament yarn as a core and entangling the core with ordinary dyeable short fibers as the sheath. CONSTITUTION:The core component of the conjugate spun yarn is an ultra-high tenacity multifilament yarn composed of an ultra-high molecular weight polyethylene having a tensile strength of >=20g/d, a lightness index of >=70 and a molecular weight of >=1,000,000 and the sheath component is a cotton fiber. This ultra- high tenacity multifilament yarn and a cotton fleece are supplied in laminated state by fasciated spinning process to an air-ejection nozzle placed between a front roller and a second roller and the cotton fiber is linearly entangled on the circumference of the core component in essentially non-twisted state by a gyrating air flow. The amount of the core component is 20-60wt.% based on the total weight of the core and sheath components. The core component of the obtained sheath-core conjugate spun yarn is unseeable even by dyeing the yarn in light color.

Description

Detailed Description of the Invention

[0001]

This invention has excellent mechanical properties,
The present invention relates to a core-sheath type composite spun yarn that is easy to handle during knitting and weaving, can be dyed with an ordinary dye, has good aesthetic properties, and is suitable as sports clothing.

[0002]

2. Description of the Related Art As an excellent fiber having a tensile strength of 20 g / d or more, various ultra-high strength fibers such as aramid fiber, ultra high molecular weight polyethylene fiber and carbon fiber are known. It is widely used mainly in the field of industrial materials to take advantage of its extremely high strength, but when it is used for clothing, it is difficult to dye, and the texture is hard and the hygroscopicity is poor. , Was not used very much.

In order to solve these problems, a core yarn obtained by superposing a short fiber such as cotton fiber on the multifilament yarn of the ultra-high strength fiber as described above and twisting it, and the multifilament yarn described above. There is known a mixed fiber obtained by opening the fiber, superposing the above short fibers on the fiber, and twisting the fiber. There is also known a Taslan-processed yarn in which the above-mentioned ultra-high-strength multifilament yarn is arranged in the core, ordinary synthetic fiber multifilament yarn is excessively supplied to the sheath portion, and is mixed with an air jet nozzle.

However, in the conventional composite yarns such as the core yarn, the mixed yarn and the Taslan processed yarn, the ultra-high-strength multifilament yarn is not accurately arranged in the core,
Since part of it can be seen through the sheath, it becomes marbling when dyed, and in the above core yarn and mixed yarn, twist is added to the ultra-high-strength multifilament yarn, and in the Taslan processed yarn, ultra-high-strength multifilament yarn. The strength of the ultra-high-strength multifilament yarn is significantly reduced due to the bending of the yarn, and the torque is increased due to the presence of twist in the core yarn and the mixed fiber yarn, resulting in poor handleability in post-processing such as knitting and weaving. There was a problem such as becoming.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of conventional composite yarns using ultra-high-strength multifilament yarns, without losing the high-tensile properties of ultra-high-strength multifilament yarns. , Can be dyed uniformly from light to dark colors, has good texture and hygroscopicity, and has a small torque and is easy to handle in post-processing, and is used in the clothing field, especially for sports that require high strength. The present invention provides a core-sheath type composite spun yarn that can be suitably used for knitting and weaving clothing.

[0006]

That is, the core-sheath type composite spun yarn of the present invention comprises an ultra-high-strength multifilament yarn whose core component has a tensile strength of 20 g / d or more and a lightness index of 70 or more. The multifilament yarns are arranged linearly and in a substantially non-twisted state, and the sheath component is composed of short fibers dyeable with an ordinary dye, and the core component of the total weight of the core component and the sheath component is Composition ratio is 20-60
It is characterized in that it is wt%.

The ultrahigh tenacity multifilament yarn of the present invention has a tensile strength of 20 g / d or more, preferably 30 g / d.
It is composed of fibers of d or more, more preferably 40 g / d or more, and examples thereof include multifilament yarns of aramid fibers, PTFE fibers, ultrahigh molecular weight polyethylene fibers, wholly aromatic polyester fibers, wholly aromatic polyamide fibers, and the like. It The above-mentioned multifilament yarn has a lightness index (JIS-Z-8730 (1980)) L
Needs to be 70 or more, and particularly preferably 80 or more.

The short fibers used in the sheath component are direct dyes, vat dyes, naphthol dyes, sulfur dyes, disperse dyes, reactive dyes, acid dyes, metal-containing dyes, azoic dyes,
Ordinary clothing that can be dyed with ordinary dyes such as cationic dyes, is a short fiber used for industry,
Examples include natural fibers such as cotton, wool, animal hair, hemp, and silk, chemical fibers such as rayon, cupra, acetate, polyester, nylon, acrylic, vinylon, polypropylene, and promix, and synthetic fibers. One of them may be selected and used alone, or two or more kinds of natural fibers, chemical fibers and synthetic fibers may be mixed and used. The above short fibers can be dyed in advance before being combined with the ultra-high-strength multifilament yarn.

The core-sheath type composite spun yarn composed of the ultra-high-strength multifilament yarn and the dyeable short fiber can be produced by a method generally called a binding spinning method.
That is, when pulling a fiber bundle composed of the above short fibers by a draft device, a fleece composed of the above short fibers and an ultra-high-strength multifilament yarn are overlaid on an air injection nozzle provided between a front roller and a second roller. It is manufactured by supplying and entwining the short fibers with the ultra-high-strength multifilament yarn by the swirling airflow in the air injection nozzle, and winding the composite spun yarn delivered from the front roller around a cheese bobbin.

[0010]

In the core-sheath composite spun yarn of the present invention, the super-high-strength multifilament yarn having a strength of 20 g / d or more is linearly arranged in the core portion in a substantially untwisted state. The high tenacity of the above ultra-high tenacity multifilament yarn is maximized without deteriorating. The outer periphery of the ultra-high-strength multifilament yarn is covered with short fibers (sheath component) dyeable with a normal dye, and the composition ratio of the sheath component is 40 to 80% by weight, and Since the lightness index of the super high tenacity multifilament yarn is 70 or more, even if this sheath component is dyed in a light color, the core component does not show through, and a high tenacity composite of any color tone from light to dark It can be a spun yarn, and the texture and hygroscopicity of the knitted fabric manufactured from this composite spun yarn are improved. Moreover, because the sheath component is substantially untwisted and covers the linear ultra-high-strength multifilament yarn, which is bound,
The spun yarn has a good bundling property and a small torque, which facilitates handling during rewinding or knitting. When nylon fiber, polyester fiber or acrylic fiber copolymerized with 5-sodium metal salt is used as the short fiber of the sheath component, it is effective for preventing deterioration of the core component.

However, when the composition ratio of the super-high-strength multifilament yarn (core component) is less than 20% by weight of the whole composite yarn, the strength as the composite yarn is insufficient and the performance required as sports clothing is obtained. I can't. On the other hand, when it exceeds 60% by weight, short fibers (sheath component) dyeable with ordinary dyes
Since the coating rate is insufficient and the coverage is small, the ultra-high-strength multifilament yarn with low dyeability (core component) is exposed through the gap between the short fibers of the sheath component or can be seen through after dyeing. The appearance is marbling, the desired uniform coloring cannot be obtained, and the texture and hygroscopicity deteriorate.

[0012]

[Examples] Ultrahigh-strength multifilament yarn having a core component of ultrahigh molecular weight polyethylene fibers having a molecular weight of 1,000,000 or more (trade name "Dyneema") is used, and a cotton fiber (fiber length 37 mm) or polyethylene terephthalate filament is used as a sheath component. Was used to produce various composite yarns of Example 1 and Comparative Examples 1 to 4, and the tenacity utilization ratio (the tenacity ratio of the composite yarn to the tenacity before processing the core component) was compared. Further, using the above-mentioned composite yarn, a knitted fabric was knitted by a tube knitting machine, and this knitted fabric was dyed with a dye suitable for dyeing the sheath component, and the uniformity of coloring was compared. In addition, sports socks and gloves were knitted with the above-mentioned composite yarn, and texture and hygroscopicity were compared by a wearing test. Further, the torques of the composite yarns were compared. The results are shown in Table 1. However, ultra-high molecular weight polyethylene fiber is abbreviated as ultra-high PE, and polyethylene terephthalate multifilament yarn is abbreviated as PET length.

In Table 1, the lightness index L is obtained by knitting a tube knitted fabric using the filament yarn of the ultrahigh molecular weight polyethylene fiber, and using this knitted fabric as a sample, a color difference meter manufactured by Nippon Denshoku Industries Co., Ltd. It is an average value of three measurements obtained by measurement. In addition, ⊚ of the colorability indicates uniform coloring without spots, ◯ indicates a slight marbling tone, Δ indicates a marbling tone, and × indicates a defect. In addition, ◎ of texture is excellent, ◯ is good, Δ is a little defective, and X is a defective. Also,
Hygroscopic ◎ is excellent, ◯ is good, △ is slightly bad, ×
Indicates a defect, respectively. Also, the torque is 1 from the composite yarn.
Take a sample with a length of m, bend it in the center, sandwich both ends, and measure the number of twists when hanging without load. 1
One or more times was evaluated as x.

Table 1 Example 1 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Core component type Ultra-high PE Same as same Same as same thickness (denier) 100 150 100 100 400 Number of filaments (pieces) 96 140 96 96 390 Strength (g / d) 33 33 33 33 31 Lightness index (L) 80.4 80.4 80.4 80.4 80.4 Sheath component type Cotton fiber-PET length PET length Cotton fiber Thickness (denier)-100 50-Number of filaments (pieces) --- 48 24-Strength (g / d) -5.3 5.3-Composite yarn manufacturing method Bundling spinning Single core Mixed twist Taslan Mixed fiber thickness (denier) 253 150 235 168 673 Core component composition ratio (%) 40 100 50 65 60 Strong (G) 3818 4950 2950 2358 7400 Strength (g / d) 15.1 33.0 12.5 14.1 11.0 Strength utilization rate (%) 116-89 70 60 Colorability 〇 × × △ △ Texture ◎ × △ 〇 〇 Hygroscopicity ◎ × △ △ 〇 Torque 〇 〇 △ 〇 ×

Next, the composition ratios of the core component and the sheath component (cotton fiber) in Example 1 were changed variously to produce a total of three kinds of composite yarns of Example 2 and Comparative Examples 5 and 6, and the same as above. Evaluated to. The results are shown in Table 2. For the sake of convenience, the results of Example 1 are also shown.

Table 2 Example 1 Example 2 Comparative Example 5 Comparative Example 6 Core component type Ultra-high PE Same as same Same thickness (denier) 100 100 50 100 Number of filaments (pieces) 96 96 48 96 Strength (g / d) 33 33 39 33 Brightness index (L) 80.4 80.4 80.4 80.4 Sheath component type Cotton fiber Same as same Same composite yarn Manufacturing method Bonded spinning Same as same Same thickness (denier) 253 174 327 143 Thickness (English count) 21.0 30.5 16.3 37.2 Core component composition ratio (%) 40 57 15 70 Strength (g) 3818 3599 2185 3478 Strength (g / d) 15.1 20.6 6.7 25.8 Strength utilization rate (%) 116 109 112 105 Colorability 〇 ◎ ◎ × Texture ◎ ◎ ◎ ◎ △ Hygroscopicity ◎ ◎ ◎ △ △ Torque 〇 〇 〇 〇

As is clear from Tables 1 and 2 above, Examples 1 and 2 both have high strength and high utilization factor as a composite yarn, and have good colorability, texture and hygroscopicity. It also has excellent performance such as low torque.

On the other hand, Comparative Example 1 shown in Table 1
The multifilament yarn (ultra-high-strength multifilament yarn) composed of ultra-high molecular weight polyethylene alone was inferior in colorability, texture and hygroscopicity. Also,
Since Comparative Example 2 is a plied yarn with a polyester multifilament yarn, the strength utilization factor decreases due to the influence of twisting,
The coloring property, the texture and the hygroscopic property were poor, and the torque was large, resulting in a failure. Further, in Comparative Example 3, since the polyester multifilament yarn is compounded by the Taslan processing method, the torque is small, but the ultra-high-strength multifilament yarn is bent and the tenacity factor is lowered, and the coloring property and The hygroscopicity was inferior. Further, in Comparative Example 4, since it was mixed with cotton fiber, twisting was added to the ultra-high-strength multifilament yarn, the strength utilization ratio was lowered, the torque was increased, and the coloring property was marbling. It was bad.

Further, in Comparative Example 5 shown in Table 2, since the composition ratio of the core component (ultra high strength multifilament yarn) is small, the strength utilization ratio is high, the coloring property, the texture and the hygroscopic property are good, and Despite the small torque, the strength of the composite yarn was low and it was unsuitable for sports clothing. In Comparative Example 6, the composition ratio of the core component (ultra-high-strength multifilament yarn) was excessively large and the sheath component was small, so that the coloring property was poor and the composition was marbling, and the texture and hygroscopicity were poor.

[0020]

The core-sheath type composite spun yarn of the present invention comprises an ultrahigh-strength multifilament having a core component of a tensile strength of 20 g / d or more, and the ultrahigh-strength multifilament yarn is linear and substantially Since it is arranged in a twisted state,
The high tenacity of the above-mentioned ultra-high tenacity multifilament yarn is preserved with almost no damage, and it is extremely functionally excellent. The lightness index L of the ultra-high-strength multifilament of the core component is 70 or more, and the sheath component is made of short fibers that are dyeable to ordinary dyes. Since the composition ratio is 40 to 80% by weight, the core component is satisfactorily covered with the sheath component, and the core component does not show through even when dyed in a light color. Therefore, any color from a light color to a dark color can be obtained. It can be dyed in a uniform manner, and at that time, it can be uniformly colored, has a good texture like spun yarn, has excellent hygroscopicity, and has a small torque, which makes it easy to handle during post-processing. Therefore, it is suitable for sports clothing having excellent functionality and aesthetics.

Claims (1)

[Claims] 1. A core component is composed of an ultra-high-strength multifilament yarn having a tensile strength of 20 g / d or more and a lightness index of 70 or more, and the ultra-high-strength multifilament yarn is in a linear and substantially untwisted state. A core-sheath characterized in that the core component is composed of short fibers dyeable with an ordinary dye, and the composition ratio of the core component to the total weight of the core component and the sheath component is 20 to 60% by weight. Type composite spun yarn.