JP2003073939A - Plied yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plied yarn capable of affording a lightweight, stretchable and thin fabric having excellent chlorine and abrasion resistances, a flat feeling and a dry touch. SOLUTION: The plied yarn is characterized in that 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 plied with polypropylene fibers.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a plied yarn.

More specifically, using the plied yarn of the present invention,
By high-order processing and using it for clothes, etc., it has excellent chlorine resistance and abrasion resistance, the fabric is thin, and it has a flat feeling,
The present invention relates to a plied yarn capable of obtaining a stretch fabric that is lightweight and has a silky feel, and a method for producing the same.

[0003]

2. Description of the Related Art Conventionally, as a stretch material, a polyurethane-based elastic fiber is pre-stretched, and then a polyamide fiber or polyethylene terephthalate fiber is used as a mating material, and an elastic plied yarn that is aligned and plied is used as stockings, socks, inners, It has been used for general clothing such as outerwear. Furthermore, in order to give a lightweight property to the stretch material, a polyurethane elastic fiber and a polypropylene fiber are interwoven, interwoven, or the polyurethane fiber is covered with the polypropylene fiber, or is twisted. However, the knitted and woven fabric obtained by such a method can be obtained with excellent fit and stretchability, but the texture becomes harder, the drape property deteriorates, and the fabric becomes thicker, which is required by consumers. Due to its chemical structure, polyurethane-based elastic fibers, which have not been able to meet the above requirements, generally have the drawbacks of being easily embrittled by chlorine and being easily yellowed by light and gas, and have improved durability against chlorine, light and gas compared with conventional products. Although the technique for making it possible has been disclosed, it is insufficient, and the development of a plied yarn capable of improving these defects is urgently needed.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is, when subjected to high-order processing, to be used for industrial materials, clothing, etc., because of its light weight and excellent abrasion resistance, which cannot be obtained by the conventional techniques.
It is an object of the present invention to provide a plied yarn that can obtain a stretch fabric having a thin and flat texture and a silky feel, and a method for producing the same.

[0005]

The plied yarn of the present invention has the following means in order to solve the above problems.

That is, that is, one of the constituent components is mainly composed of polyethylene terephthalate, and the other constituent component is mainly composed of polytrimethylene terephthalate, which is a side-by-side type or eccentric sheath / core type polyester-based composite fiber and polypropylene. A ply-twisted yarn, which is obtained by ply-twisting with fibers.

Further, the method for producing a plied yarn according to the present invention employs the following means in order to solve the above problems.

That is, one of the side-by-side type or eccentric sheath / core type polyester-based composite fibers and polypropylene fibers, one of the constituents of which has polyethylene terephthalate as the main component and the other of which has polytrimethylene terephthalate as the main component. A method for producing a plied yarn, which comprises ply-twisting.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The plied yarn of the present invention will be described below. FIG. 1 is a schematic side view showing an example of the plied yarn of the present invention. The plied yarn (c) of the present invention is a plied yarn having a structure in which the polyester composite fiber (a) and the polypropylene fiber (b) are twisted together. FIG. 2 is a schematic side view of the plied yarn (he) of the present invention, which has been treated with boiling water at 98 ° C. for 30 minutes under no load. By subjecting the polyester-based conjugate fiber (d) to boiling water treatment to develop latent crimps with high shrinkage, a core-sheath structure that is bulky and rich in stretchability can be developed.

The double-twisted yarn of the present invention is a side-by-side type or eccentric sheath / core type polyester composite in which one of the constituents is mainly polyethylene terephthalate and the other is mainly polytrimethylene terephthalate. Made of fiber.

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 and polybutylene terephthalate fibers, 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 has a gauche-gauche structure (the molecular chain bends at 90 degrees), and further the interaction between benzene rings (stacking, parallel).
Since the density of constraint points is low and flexibility is high, the molecular chain can easily be extended by rotation of the methylene group.
I'm thinking of recovering.

The polyethylene terephthalate, which is a constituent component of the polyester composite fiber in the plied 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, 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. As the copolymerizable compound, for example, sulfonic acid, sodium sulfonic acid, sulfuric acid, sulfuric acid ester,
Dicarboxylic acids such as diethyl sulfate, 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-hydroxybenzoic acid,
dicarboxylic acids such as hydroxycarboxylic acids such as ε-caprolactone, triethylene glycol, polyethylene glycol, propanediol, butanediol,
Pentanediol, hydroquinone, bisphenol A
Diols such as 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.

The polytrimethylene terephthalate, which is another component of the polyester-based conjugate fiber in the plied yarn of the present invention, is preferably a polymer component having a trimethylene terephthalate unit as a main repeating unit.

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.

It is essential to use polypropylene fibers in the plied yarn of the present invention. If polypropylene fibers are not used, there is a problem in that when a knitted woven fabric is formed, it has excellent chlorine resistance and abrasion resistance, the fabric is thin, has a flat feeling, and is lightweight and has a smooth feel.

The polypropylene fiber may be either filament yarn or spun yarn.

Specifically, the filament yarn may be any one of a raw yarn, a temporary twisted yarn, a twisted yarn, a yarn-dyed yarn, and a composite yarn of these.

The fineness of the polypropylene 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 polypropylene fiber is preferably in the range of 0.4 decitex or more and 25 decitex or less depending on the application.

The spun yarn may be either a spun yarn or a spun yarn.

It is preferable that these are stable yarns that are easily twisted.

Next, the method for producing the plied yarn according to the present invention will be described.

FIG. 3 is a schematic diagram showing an example of the method for producing a plied yarn according to the present invention.

In the present invention, the twisting machine used for ply twisting is preferably a commercially available up twister, covering machine, italic twisting machine, down twister, double twister, or the like.

In the present invention, since the polyester-based composite fiber has a coil-shaped actual crimp, the plied yarn forms a core-sheath structure in the state in which the actual crimp is extended and the plied yarn is twisted. From the perspective of obtaining the effect of promoting
In the above, the polyester-based composite fiber 1 has a pretension of 0.01 cN / dtex or more between the washer tensor 4 and the feed roller 8 immediately before being inserted into the draft zone between the feed roller 8 and the delivery roller 10 of the twisting machine. It is preferable that it is applied.

Further, regarding the polypropylene fiber 2 to be twisted, from the viewpoint that a stable yarn can be supplied and a uniformly twisted yarn can be obtained in the yarn longitudinal direction, 0.01 cN / dtex between the washer tenser 3 and the delivery roller 10 is obtained. Above, it is preferable to apply a pretension smaller than that of the polyester-based composite fiber.

As a method for pretensioning the polyester-based composite fiber or the polypropylene fiber to be twisted,
It is preferable to use a washer tensor or a magnet tensor.

Further, from the viewpoint of facilitating the formation of the core-sheath structure of the plied yarn in the twisted yarn state and improving the stretchability, the draft between the feed roller 8 and the delivery roller 10 is 1.0 or more and 1 or more. It is preferable to apply so as to be in the range of 0.6 or less.

The polypropylene fiber 2 is aligned by the snell guide 9 and aligned with the polyester-based composite fiber 1, and is twisted by rotating the spindle 14.

The twist number may be appropriately selected depending on the fineness of the polypropylene fiber to be the sheath yarn when the core-sheath structure is developed and the number of filaments, but is preferably in the range of 100 to 2000 T / m. If the twist number is less than 100 T / m, the yarn length difference generated between the core yarn and the sheath yarn becomes large after the fabric is formed and heat-treated, and the sheath yarn floats from the core yarn to form a fabric. At that time, there is a tendency for the eyes to be turned or to have a feeling of stuffiness. On the other hand, if the twist number is greater than 2000 T / m, the core yarn is constrained by the sheath yarn, which tends to significantly reduce the stretchability of the fabric.

The knitted fabric using the plied yarn of the present invention is excellent in durability, light resistance and chlorine resistance, less likely to cause wrinkles and wrinkles, excellent in appearance quality, soft and dry feeling, It is thin, has excellent stretchability and morphological stability.
It can be used as outerwear such as jackets and bottoms, women's clothing such as dresses, skirts and lingerie, and stretch materials such as shirts, nightwear, sports clothing and baby clothing.

[0041]

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-based composite fiber (drawn yarn) of 56 dtex24 filament. Using the obtained polyester-based conjugate fiber and 56dtex24 filament polypropylene stretched yarn, a twisting process shown in FIG. 3 was used to perform a twisting under the following conditions. Before being aligned with the polypropylene fibers, the polyester-based composite fibers were fed through a washer tensor so that a pretension of 0.01 cN / dtex or more was applied, and drafted between the feed roller and the delivery roller.

Pre-tension of core yarn: 4 g Pre-tension of sheath yarn: 1 g Twist number: Z450T / m Draft: 1.1 Spindle speed: 8000 rpm Using the obtained plied yarn, 28 gauge, 1 knitting machine As a result of knitting, scouring and finishing, a fabric having a thin fabric, a light weight and a smooth touch, and having good stretchability was obtained.

[Example 2] Using the same side-by-side type polyester composite fiber of 56 dtex24 filament and polypropylene false twisted yarn of 56 dtex24 filament which are the same as those used in Example 1, ply-twisted under the following conditions as in Example 1. And a twisted yarn was obtained.

Pre-tension of core yarn: 4 g Pre-tension of sheath yarn: 1 g Twist number: Z450T / m Draft: 1.0 (none) Spindle speed: 8000 rpm Using the obtained plied yarn, the same as in Example 1 The knitted fabric was knitted with a 28-gauge, single-pitch knitting machine to obtain a knitted fabric having a scouring, soft and silky feel.

Example 3 Using the same 56dtex24 filament side-by-side type polyester conjugate fiber as that used in Example 1 and polypropylene spun yarn # 80, ply-twisting was performed under the following conditions as in Example 1.
I got a twisted yarn.

Pretension on polyester composite fiber side: 4 g Pretension on mating material side: 1 g Twist number: Z450T / m Draft: 1.0 (none) Spindle speed: 8000 rpm Implemented using the obtained plied yarn In the same manner as in Example 1, knitting with a 28 gauge, single-pitch knitting machine, scouring and finishing were performed, and as a result, a knitted fabric having a lightweight, soft and wooly feel was obtained.

[Comparative Example 1] A 20 dtex polyurethane yarn and a 56 dtex 24 filament polypropylene drawn yarn were used to ply under the same conditions as in Example 1 to obtain a plied yarn. However, the polyurethane yarn was fed by rolling (positive feeding), and only the polyurethane elastic fiber was drafted between the yarn feeding roller and the delivery roller, and then aligned with the polypropylene drawn yarn and twisted.

Number of twists: Z450T / m Draft: 3.0 times Spindle rotation speed: 8000 rpm Using the obtained plied yarn, knitting with a 28 gauge, single-pitch knitting machine in the same manner as in Example 1, scouring and finishing. As a result of the processing, a knitted fabric having a high level of elasticity but poor durability when worn and chlorine resistance, a thick fabric, and a hard texture was obtained.

[Comparative Example 2] A 20 dtex polyurethane-based elastic fiber was drafted, then aligned with a 56 dtex 24-filament polypropylene false twisted yarn, and plied.
I got a twisted yarn.

Number of twists: 800 T / m Draft: 3.0 times Spindle speed: 8000 rpm Using the obtained plied yarn, knitting with a 28 gauge, single knitting machine in the same manner as in Example 1, scouring and finishing. As a result of the processing, a knitted fabric having a high level of elasticity but poor durability when worn and chlorine resistance, a thick fabric, and a hard texture was obtained.

Comparative Example 3 Using the same side-by-side type polyester conjugate fiber of 56 dtex24 filament and the polyethylene terephthalate drawn yarn of 56 dtex24 filament, which is the same as that used in Example 1, ply-twisting was conducted under the following conditions in the same manner as in Example 1. This was applied to obtain a plied yarn.

Pre-tension of core yarn: 4 g Pre-tension of sheath yarn: 1 g Twist number: Z450T / m Draft: 1.0 (none) Spindle speed: 8000 rpm Using the obtained plied yarn, the same as in Example 1 Furthermore, as a result of knitting with a 28 gauge, 1-pitch knitting machine, scouring and finishing, a desired stretchability could be obtained, but the texture was slightly stiff and the knitted fabric lacked a lightweight feel.

[0055]

EFFECTS OF THE INVENTION By using the plied yarn of the present invention, a stretch cloth having excellent durability and chlorine resistance, a thin cloth, a light weight, and a dry feeling and a soft feeling can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of a plied yarn according to the present invention.

FIG. 2 is a schematic side view showing an example of a plied yarn treated with boiling water in an unloaded state.

FIG. 3 is a schematic diagram showing an example of a method for producing a plied yarn according to the present invention.

[Explanation of symbols]

(A): Polyester composite fiber (B): Polypropylene fiber (C): Plied yarn (D): Polyester composite fiber (E): Polypropylene fiber (F): plied yarn 1: Polyester composite fiber 2: Polypropylene fiber 3: Washer tensor 4: Washer tensor 5: Guide bar 6: Guide bar 7: Snell guide 8: Feed roller 9: Snell guide 10: Delivery roller 11: Snell guide 12: Ring rail 13: Traveler 14: Spindle 15: Belt

Continued front page    (72) Inventor Mieko Kuroiwa             1-2-2 Sonoyama, Otsu City, Shiga Prefecture             DuPont Co., Ltd. Shiga Plant F-term (reference) 4L036 MA04 MA05 MA15 MA17 MA24                       MA33 MA35 MA37 MA39 PA18                       PA21 PA46 RA25 UA01                 4L041 AA07 BA02 BA05 BA09 BA22                       BB08 BC05 CA06 CA08 DD10

Claims (3)

[Claims] 1. A side-by-side type or eccentric sheath / core type polyester-based composite fiber and a polypropylene fiber, one of the constituents of which has polyethylene terephthalate as a main component and the other constituent has a polytrimethylene terephthalate as a main component. A ply-twisted yarn characterized by being plied with. 2. The plied yarn according to claim 1, wherein the weight ratio of polyethylene terephthalate / polytrimethylene terephthalate of the polyester-based composite fiber is 30/70 to 70/30. 3. A side-by-side type or eccentric sheath / core type polyester-based composite fiber and polypropylene fiber, one of the constituents of which has polyethylene terephthalate as a main component, and the other of which has polytrimethylene terephthalate as a main component. A method for producing a plied yarn, which comprises ply-twisting.