JP2003073942A - Core spun yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core spun yarn capable of affording a stretchable and thin fabric having a flat feeling, excellent hygroscopicity, heat reserving properties and shape stability and a slimy feeling and a pliable touch unique to animal hair fibers such as wool. SOLUTION: The core spun yarn comprises a core yarn and a sheath yarn. In the core spun yarn, polyester conjugated fibers which are a side-by-side type or an eccentric sheath-core type comprising one of constituent components consisting essentially of polyethylene terephthalate and the other constituent component consisting essentially of polytrimethylene terephthalate are used as the core yarn and the animal hair fibers are used as the sheath yarn.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a core spun yarn and a method for producing the same.

More specifically, the core-spun yarn of the present invention is used for higher-order processing and used for clothes and the like,
The present invention relates to a corespun yarn, which is excellent in durability, chlorine resistance, and light resistance, has a thin fabric, has a flat feeling, and has a dry and soft touch, and a method for producing the same.

[0003]

2. Description of the Related Art Heretofore, in animal hair fiber products, polyurethane elastic fibers and animal hair fibers have been knitted, woven, or twisted in order to impart stretchability. However, the knitted fabric obtained by such a method can have excellent fit and stretchability,
Since the texture becomes hard, the drape property deteriorates, and the cloth becomes thick, it is not possible to obtain sufficient characteristics that satisfy the consumer's requirements. Furthermore, generally, polyurethane-based elastic fibers have a drawback that they are easily embrittled by chlorine due to their chemical structure and easily yellowed by light or gas.
Techniques for improving durability against light and gas and yellowing resistance have been disclosed, but they are insufficient, and development of a textured yarn capable of improving these defects is urgently needed.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to obtain a dyeing property, a dyeing fastness, a soft texture, a durability, which cannot be obtained by the conventional techniques, when it is subjected to high-order processing and used for clothes and the like. It is an object of the present invention to provide a core-spun yarn that is excellent in chlorine resistance and light resistance, has a thin cloth having a flat feeling, and can obtain a stretched cloth having a dry and soft touch, and a method for producing the same.

[0005]

The corespun yarn of the present invention adopts the following means in order to solve the above-mentioned problems.

That is, a core spun yarn consisting of a core yarn and a sheath yarn, wherein one of the constituent components of the core yarn is polyethylene terephthalate as a main component, and the other constituent component is a side by side type having polytrimethylene terephthalate as a main component. An eccentric sheath / core type polyester composite fiber is used, and animal hair fiber is used for the sheath yarn, which is a core-spun yarn.

The method for producing a core spun yarn of the present invention employs the following means in order to solve the above problems.

That is, as a core yarn, side-by-side type or eccentric sheath / core type polyester-based composite fibers in which one of the constituents contains polyethylene terephthalate as the main component and the other constituent contains polytrimethylene terephthalate as the main constituent. A method for producing a core-spun yarn, characterized in that animal hair is used for the sheath yarn.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The core spun yarn of the present invention will be described below. FIG. 1 is a schematic side view showing an example of the core spun yarn of the present invention. The core spun yarn (C) of the present invention is
A core-spun yarn having a core-sheath structure in which the polyester-based composite fiber (a) having an actual crimp, which is a core yarn, is covered with animal hair fiber (b), which is a sheath yarn, while twisting. 2 in FIG.
FIG. 3 is a schematic side view of the core-spun yarn (he) of the present invention that has been treated with boiling water at 8 ° C. for 30 minutes under no load. By the boiling water treatment, the polyester-based conjugate fiber (d) develops a latent crimp while highly shrinking, so that the core-spun yarn of the present invention generates an appropriate yarn length difference and crimp, and has a high bulkiness. It will be highly stretchable.

The core yarn of the core spun yarn of the present invention is a side-by-side type or an eccentric sheath / core type in which one of the constituents contains polyethylene terephthalate as a main component and the other constituent contains polytrimethylene terephthalate as a main constituent. A polyester-based composite fiber is used.

By bonding polymers having different intrinsic viscosities to each other in the polyester-based conjugate fiber, stress concentrates on the high viscosity side during spinning and drawing, so that the internal strain differs between the two components. Therefore, the high-viscosity side is largely shrunk due to the difference in elastic recovery rate after stretching and the difference in heat shrinkage in the heat treatment step of the cloth, and distortion occurs in the single fiber to take a three-dimensional coil crimp form. It can be said that the diameter of the three-dimensional coil and the number of coils per single fiber length are determined by the shrinkage difference (including the elastic recovery rate difference) between the high shrinkage component and the low shrinkage component. Is small, and the number of coils per unit fiber length is large.

Coil crimps required as a stretch material have a small coil diameter, a large number of coils per unit fiber length (excellent elongation characteristics and good appearance), and good coil sag resistance (expansion and contraction). The amount of coil fatigue depending on the number of times is small and the stretch retention property is excellent. Furthermore, the expansion and contraction characteristics of the coil are dominated by the expansion and contraction characteristics of the high contraction component with the low contraction component as the fulcrum. The polymer used for is required to have high extensibility and recoverability. Therefore, the inventors of the present invention have conducted extensive studies in order to satisfy the above properties without impairing the properties of polyester. As a result, the low shrinkage component contains polyethylene terephthalate as a main component, and the high shrinkage component contains polytrimethylene terephthalate as a main component. It was found to use the polyester composite fiber. The polytrimethylene terephthalate fiber has mechanical properties and chemical properties equivalent to those of polyethylene terephthalate fiber and polybutylene terephthalate fiber, which are typical polyester fibers, and is extremely excellent in elongation recovery. This is because the methylene chain of the alkylene glycol part in the crystal structure of polytrimethylene terephthalate is gauche-
The gauche structure (the molecular chain bends at 90 degrees), the density of constraint points due to the interaction between the benzene rings (stacking, parallel) is low, and the flexibility is high. We believe that it will easily grow and recover.

The polyethylene terephthalate which is a constituent component of the core yarn in the core spun yarn of the present invention is preferably a polymer component having an ethylene terephthalate unit as a main repeating unit. That is, as the polyethylene terephthalate in the present invention, a polyester obtained by using terephthalic acid as a main acid component and ethylene glycol as a main glycol component is preferable.
However, other copolymerizable components capable of forming an ester bond are 2
Those contained in a proportion of 0 mol% or less are preferable, and those contained in a proportion of 10 mol% or less are more preferable. As the copolymerizable compound, for example, sulfonic acid, sodium sulfonic acid, sulfuric acid, sulfuric ester, diethyl sulfate,
Dicarboxylic acids such as ethyl sulfate, aliphatic sulfonic acid, ethanesulfonic acid, chlorobenzenesulfonic acid, alicyclic sulfonic acid, isophthalic acid, sebacic acid, azelaic acid, dimer acid, adipic acid, oxalic acid and decanedicarboxylic acid, p- Dicarboxylic suns such as hydroxybenzoic acid and hydroxycarboxylic acids such as ε-caprolactone, diols such as triethylene glycol, polyethylene glycol, propanediol, butanediol, pentanediol, hydroquinone and bisphenol A are preferably used.

If necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, a hindered phenol derivative as an antioxidant, and a coloring pigment may be added.

Polytrimethylene terephthalate, which is another constituent of the core yarn in the core spun yarn of the present invention, is
Those comprising a polymer component containing a trimethylene terephthalate unit as a main repeating unit are preferable.

That is, as the polytrimethylene terephthalate in the present invention, a polyester obtained by using terephthalic acid as a main acid component and 1,3 propanediol as a main glycol component is preferable. However, it is also preferable that the content of the other copolymerizable component capable of forming an ester bond is 20 mol% or less, and that of 10 mol% or less is more preferable. Examples of the copolymerizable compound include diphthalic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid and 5-sodium sulfoisophthalic acid, ethylene glycol, diethylene glycol,
Diols such as butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol and polypropylene glycol are preferably used.

If necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, a hindered phenol derivative as an antioxidant, a color pigment, etc. may be added.

In the present invention, the intrinsic viscosity of polytrimethylene terephthalate is 1. From the viewpoint of expressing a coiled crimp and obtaining desired stretchability when forming a knitted fabric.
It is preferably 0 or more, more preferably 1.2 or more.

The cross-sectional shape of the single fiber of the polyester composite fiber used in the present invention is a side-by-side type or an eccentric sheath / core type.

Unless the cross-sectional shape is a side-by-side type or an eccentric sheath / core type, when heat is applied to the yarn,
There is a problem that the coiled crimp does not appear and the yarn cannot be stretched.

The weight ratio of polyethylene terephthalate / polytrimethylene terephthalate in the polyester composite fiber is in the range of 30/70 or more and 70/30 or less from the viewpoint of spinnability and dimensional homogeneity of the coil in the fiber length direction. It is preferable.

The fineness of the polyester composite fiber is preferably in the range of 20 decitex or more and 1000 decitex or less depending on the purpose of use.

Further, the single yarn fineness of the polyester composite fiber is preferably in the range of 0.4 decitex or more and 25 decitex or less depending on the use.

In the present invention, it is essential to use animal hair fibers for the sheath yarn. By using animal hair fibers for the sheath yarn, it is possible to realize a high-quality woolen or worsted appearance and a texture with a slimy feel, excellent heat retention and moisture absorption when a knitted fabric is obtained.

Animal hair fibers are produced by spinning animal hair, and there are woolen yarns and worsted yarns, and any of them may be used.

Further, it may be spun alone or blended. These are preferably stable yarns that are easily twisted.

As the kind of animal hair used in the present invention, wool, cashmere, mohair, camel, alpaca, angora and the like are preferable, and wool is particularly preferable since it has excellent elasticity.

The types of wool include Merino, which is most commonly used for general clothing, Lincoln, Lester, Ronnie, Marsh, Southdown, Syrupshire, Cheviot, and the like. Wool collected from can be used. Wool consists of two different components, called paracortex and orthocortex, laminated together. Since paracortex grows slightly less, it grows while being pulled toward the paracortex side, so it is called a bilateral structure. Since it has a spiral spring crimp, it has excellent elasticity and is suitable for use as the sheath yarn of the present invention. The type and fineness of the animal hair fiber may be appropriately selected in consideration of the gloss, form, stretchability, and texture of the core spun yarn.

Particularly, the roving fineness of the sheath yarn is preferably in the range of 800 decitex or more and 40,000 decitex or less according to the purpose of use, and the sheath yarn after drafting is preferably in the range of 20 decitex or more and 1000 decitex or less.

Further, the single yarn fineness of the sheath yarn is preferably in the range of 0.4 decitex or more and 25 decitex or less depending on the application.

The core-spun yarn in the present invention is a processed yarn in which the core yarn is a filament and the sheath yarn is a short fiber bundle, a roving yarn, or a spun yarn. For example, the roving yarn is drafted on the core yarn during the spinning process. It is obtained by winding while winding.

Next, the method for producing the core spun yarn of the present invention will be described with reference to FIG.

FIG. 3 is a schematic diagram showing an example of producing the core spun yarn of the present invention using a commercially available spinning machine.

In the present invention, polyester-based composite fiber and animal hair fiber are used. The polyester-based composite fibers are filament yarns, and the animal hair fibers are spun yarn rovings.

In FIG. 3, the polyester-based conjugate fiber used as the core yarn 1 has a coil-shaped actual crimp, and is subjected to fine spinning by twisting the actual crimp in a stretched state, From the viewpoint of improving the coverage of the core spun yarn, a draft of 1.02 to 1.70 times is applied between the feed roller 4 and the delivery roller 7 before the animal hair fibers that are the sheath yarn 2 and the delivery roller 7 are aligned. Is preferred.

Alternatively, it is preferable to apply a tension of 0.01 cN / dtex or more.

As a method of applying tension, it is preferable to insert a washer tensor, a magnet tensor or the like. In FIG. 3, the washer tensor 3 is used.

On the other hand, the sheath yarn 2 which is the animal wool roving is the core yarn 1
It is preferable to draft at 25 to 50 times before aligning with the delivery roller 7. The yarns aligned on the delivery roller 7 are twisted by rotating the spindle, and wound on the winding package 9 via the snell guide 8.

The number of twists in the fine spinning twist is such that after the fabric is formed and heat-treated, the covering property is sufficient to prevent the appearance of eyes and to prevent the feeling of stickiness. From the viewpoint of preventing the core yarn from being restrained by the sheath yarn and greatly reducing the stretchability of the fabric and preventing the texture from becoming hard, it may be appropriately selected depending on the fineness of the sheath yarn and the number of filaments. It is preferably in the range of 100 to 2000 T / m.

[0040]

The present invention will be described in more detail with reference to the following examples.

The intrinsic viscosity (η) in the examples was determined by the following method. However, the present invention is not limited to these examples. [Intrinsic Viscosity (η)] 0.10 g of a sample was dissolved in 10 ml of orthochlorophenol and measured at a temperature of 25 ° C using an Ostwald viscometer.

[Example 1] Polytrimethylene terephthalate having an intrinsic viscosity of 1.31 and polyethylene terephthalate having an intrinsic viscosity of 0.52 were separately melted and spun at a spinning temperature of 260 ° C from a 24-hole composite spinneret. / Polytrimethylene terephthalate is discharged at a weight ratio of 50/50, and the spinning speed is 14
It was taken up at 00 m / min to obtain an undrawn yarn of 165 dtex24 filament. Further, using a hot roll-hot plate stretching machine, hot roll temperature 70 ° C., hot plate temperature 145
The film was drawn at a draw ratio of 3.0 ° C. of 3.0 to obtain a side-by-side type polyester composite fiber (drawn yarn) of 55 dtex24 filament. Using the obtained polyester-based composite fiber as a core yarn and wool roving as a sheath yarn, a fine spinning process as shown in FIG. 3 was used to perform fine spinning twisting under the following conditions.
It should be noted that the polyester-based conjugate fiber is 0.01 cN / dte before being aligned with the other material, wool roving.
The yarn was fed and pre-drafted through a washer tensor so that a pre-tension was applied for x or more.

Pre-tension of core yarn: 4 g Draft of core yarn: 1.1 Draft of roving yarn: 40 Twist number: Z300 T / m Using the obtained core spun yarn, knitting with a 28 gauge, single knitting machine, As a result of dyeing with a disperse dye and an acid dye in a single bath and finishing, it has an elegant, worsted look, and the fabric is thin,
It has a flat feeling, is less likely to cause wrinkles and wrinkles, has excellent hygroscopicity, heat retention, shape stability, has a slimy feel, has a supple touch, has good stretchability, and is suitable for outerwear, shirts and socks. Got the ground.

[Example 2] The same side-by-side type polyester conjugate fiber of 55 dtex24 filament as that used in Example 1 was used as a core yarn, and wool roving was used as a sheath yarn. Spun twisting was performed to obtain a core spun yarn.

Pretension of core yarn: 4 g Draft of core yarn: 1.1 Draft of roving yarn: 40 Twist number: Z550 T / m Using the obtained core spun yarn, knitting with a 28 gauge, single knitting machine, As a result of dyeing with a disperse dye for polyester and an acid dye in a single bath and finishing, as a result, it has an elegant and worsted appearance, the fabric is thin, it has a high-grade wrinkle, hygroscopicity, heat retention,
A knitted fabric having excellent morphological stability, stretchability with dryness and slimy feel was obtained.

[Comparative Example 1] Using 20 dtex polyurethane yarn and wool roving, fine spinning was performed under the following conditions in the same manner as in Example 1 to obtain a core spun yarn. However, as shown in Fig. 4, the polyurethane yarn is fed by rolling, and after only the polyurethane yarn is pre-drafted between the yarn feeding roller and the delivery roller, it is aligned with the wool roving and fine-spun. Twisted

Draft of core yarn: 3.7 Draft of roving yarn: 40 Number of twists: Z300T / m Using the obtained plied yarn, knitting with a 28 gauge, single knitting machine in the same manner as in Example 1, As a result of dyeing and finishing with an acid dye, a knitted fabric having a high level of elasticity but poor wear resistance, chlorine resistance and light resistance, a thick fabric, and a hard texture was obtained.

Comparative Example 2 The same side-by-side type polyester conjugate fiber of 55 dtex24 filament as that used in Example 1 was used as the core yarn, and polypropylene roving was used as the sheath yarn. It was spun and twisted.

Pre-tension of core yarn: 4 g Draft of core yarn: 1.1 times Draft of roving yarn: 40 Twist number: Z300 T / m Using the obtained core spun yarn, knitted with a 28 gauge, single knitting machine. As a result of scouring and finishing, the stretchability was the same as in Example 1, but the hygroscopicity, heat retention and morphological stability were poor, and a satisfactory knitted fabric was not obtained.

[0050]

EFFECTS OF THE INVENTION By using the core spun yarn of the present invention, the cloth is thin, has a flat feeling, and has hygroscopicity, heat retention,
It is possible to obtain a soft-retched cloth having excellent morphological stability and having a slimy feel and a supple touch unique to animal hair fibers such as wool.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of a core spun yarn of the present invention.

FIG. 2 is a schematic side view showing an example of the core-spun yarn of the present invention that has been subjected to boiling water treatment under a no-load condition.

FIG. 3 is a schematic diagram showing an example of a processing step for obtaining the core spun yarn of the present invention.

[Explanation of symbols]

(A): Polyester composite fiber (B): Animal hair fiber (C): Core spun yarn (D): Polyester composite fiber (E): Animal hair fiber (F): Core spun yarn 1: Polyester composite fiber 2: Animal hair fiber 3: Washer tensor 4: Feed roller 5: Feed roller 6: Guide 7: Delivery roller 8: Snell guide 9: Winding package

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenro Kamiya             1-2-2 Sonoyama, Otsu City, Shiga Prefecture             DuPont Co., Ltd. Shiga Plant F-term (reference) 4L036 MA05 MA10 MA15 MA17 MA24                       MA33 MA35 MA37 MA39 PA18                       PA21 PA31 PA46 RA03 RA25                       UA01                 4L041 AA07 BA02 BA05 BA09 BA22                       BB08 BC05 CA06 CA08 DD10

Claims (3)

[Claims] 1. A core-spun yarn comprising a core yarn and a sheath yarn, wherein one of the constituent components of the core yarn is polyethylene terephthalate as a main component, and the other constituent component is of polytrimethylene terephthalate as a main component. An eccentric sheath / core type polyester composite fiber is used, and animal hair fiber is used for the sheath yarn, which is a core-spun yarn. 2. The core-spun yarn according to claim 1, wherein the weight ratio of polyethylene terephthalate / polytrimethylene terephthalate of the polyester-based conjugate fiber is 30/70 to 70/30. 3. A side-by-side type or eccentric sheath / core type polyester-based composite fiber, one of the constituents of which has polyethylene terephthalate as a main component, and the other constituent of which has polytrimethylene terephthalate as a main component, as a core yarn. A method for producing a core spun yarn, characterized in that animal hair is used as the sheath yarn.