JP2003286620A - False twist textured yarn and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a false twist textured yarn affording a bulky stretchable fabric having a flat feeling and a dry touch, and to provide a method for producing the false twist textured yarn. <P>SOLUTION: The false twist textured yarn is composed of a core yarn and a sheath yarn. Polyurethane elastic fibers are used as the core yarn and side-by- side type or eccentric sheath-core type polyester conjugated fibers in which one of constituent components consists essentially of polyethylene terephthalate and the other constituent component consists essentially of polytrimethylene terephthalate are used as the sheath yarn. The core and sheath yarns are false twisted. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a false twist textured yarn.

More specifically, the false twisted yarn of the present invention is used for higher-order processing and used for clothes or the like to obtain a stretched fabric having a flat feeling, excellent shape stability and a dry feeling. The present invention relates to a false twisted textured yarn and a method for producing the same.

[0003]

2. Description of the Related Art Conventionally, as a stretch material, a processed yarn obtained by coating polyurethane elastic fibers as a core yarn with polyamide fiber or polyethylene terephthalate fiber in a single layer or a double layer has been used for general clothing such as stockings, socks, innerwear and outerwear It has been used for various purposes. As described above, when a knitted fabric is formed from a processed yarn using a polyurethane-based elastic fiber as the core yarn, it is possible to obtain a product having excellent fit and stretchability, but wrinkles occur on the surface of the fabric and unevenness occurs. It has the drawback of occurring.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bulky and flat appearance when subjected to high-order processing and used for clothes or the like, which has a firmness, elasticity, and repulsion that cannot be obtained by conventional techniques. It is an object of the present invention to provide a false twisted yarn capable of obtaining a stretch fabric having a soft and dry touch and a method for producing the false twisted yarn.

[0005]

The false twisted yarn of the present invention is
The following means are adopted to solve the above problems.

That is, a false twisted yarn consisting of a core yarn and a sheath yarn, in which a polyurethane elastic fiber is used for the core yarn,
One of the constituent components of the sheath yarn is mainly composed of polyethylene terephthalate, and the other constituent component is a side-by-side type or eccentric sheath / core type polyester composite fiber whose main component is polytrimethylene terephthalate. It is a false twist textured yarn characterized by being false twisted.

Further, the method for producing the false twist textured yarn of the present invention is
The following means are adopted to solve the above problems.

That is, after the polyurethane elastic fiber is drafted, one of the constituents is mainly composed of polyethylene terephthalate, and the other constituent is mainly composed of polytrimethylene terephthalate, which is a side-by-side type or eccentric sheath / core. A method for producing a false-twist textured yarn, which comprises aligning a polyester-based composite fiber as a mold and false-twisting.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The false twisted yarn of the present invention will be described below. FIG. 1 is a schematic side view showing an example of the false twist textured yarn of the present invention. The false twisted yarn (c) of the present invention is substantially non-twisted, and shows a form in which the core of the polyurethane elastic fiber (a) is twist-coated with the polyester composite fiber (b). .

Polyurethane elastic fiber is used as the core yarn of the false twisted yarn of the present invention.

The polyurethane elastic fiber used as the core yarn of the false twist textured yarn of the present invention is obtained by spinning a polyurethane polymer obtained by reacting a polymer diol, an isocyanate mainly composed of an organic diisocyanate, and a polyfunctional active hydrogen compound. What was obtained by this is preferable.

The polymer diol used in the present invention includes polytetramethylene glycol, polyethylene glycol, polyether glycols such as propylene ether glycol, ethylene glycol, 1,6-
At least one of glycols such as hexanediol, 1,4-butanediol, neopentyl glycol and adipic acid, suberic acid, azelaic acid, sebacic acid,
Polyester glycols obtained by reacting at least one dicarboxylic acid such as β-methyladipic acid and isophthalic acid, polymer diols such as polycaprolactone glycol and polyhexamethylene dicarbonate glycol, or a mixture or a mixture of two or more thereof. Polymers are preferred.

The organic diisocyanates used in the present invention include 4,4'-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate,
4-phenylene diisocyanate, 2,4-tolylene diisocyanate, hexamethylene diisocyanate,
1,4-cyclohexane diisocyanate, 4,4'-
One or a mixture of two or more organic diisocyanates such as dicyclohexylmethane diisocyanate and isophorone diisocyanate is preferable. Further, a small amount of triisocyanate may be used in combination.

The polyfunctional active hydrogen compound used in the present invention includes ethylenediamine, 1,2-propylenediamine, hexamethylenediamine, xylylenediamine,
4,4'-diphenylmethanediamine, hydrazine,
1,4-diaminopiperazine, ethylene glycol,
1,4-butanediol, 1,6-hexanediol,
One kind such as water or a mixture of two or more kinds thereof is preferable. If desired, these compounds may be used in a small amount in combination with a terminating agent such as monoamine or monoalcohol. Further, 2,6-ditetrabutylparacresol, antioxidants such as phosphite, light or ultraviolet absorbers such as hydroxybenzophenone-based or hydroxybenzothiazole, 1,1-dialkyl-substituted semicarbazide,
Gas yellowing such as dithiocarbamate, a deterioration inhibitor, and white pigments such as titanium oxide and zinc oxide may be appropriately used.

The fineness of the polyurethane elastic fiber used in the present invention is preferably in the range of 10 to 60 decitex,
The range of 15 to 35 decitex is more preferable.

The breaking elongation is preferably 300% or more.

Further, the cross-sectional shape of the polyurethane elastic fiber may be circular or flat.

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

When the polymers having different intrinsic viscosities are bonded 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.

The coil crimp required as a stretch material has a small coil diameter, a large number of coils per unit fiber length (excellent extension characteristics and good appearance), and good coil settling 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.

Then, the inventors of the present invention have conducted extensive studies to satisfy the above-mentioned properties without impairing the properties of polyester. As a result, polyethylene terephthalate is the main component in the low shrinkage component, and polytrimethylene terephthalate is in the high shrinkage component. It has been found that a polyester-based composite fiber as the main component is used. 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 has a gauche-gauche structure (the molecular chain is 90
Bend), and the density of constraint points due to the interaction (stacking, parallel) between benzene rings is low,
It is considered that the molecular chain easily extends and recovers due to the rotation of the methylene group due to its high flexibility.

The polyethylene terephthalate, which is a constituent component of the polyester composite fiber used for the sheath yarn of the false twisted textured 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, 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, decanedicarboxylic acid Dicarboxylic acid such as 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 desired, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives as antioxidants, color pigments, etc. may be added.

Polytrimethylene terephthalate, which is another constituent of the polyester composite fiber used for the sheath yarn of the false twisted yarn of the present invention, is composed of a polymer component containing trimethylene terephthalate units as main repeating units. Is preferred.

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 desired, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives as antioxidants, color pigments and the like 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-based conjugate fiber is preferably in the range of 10 decitex or more and 60 decitex or less depending on the purpose of use.

In the present invention, the single yarn fineness of the polyester-based conjugate fiber is preferably 0.4 decitex or more and 2.5 decitex or less.

Next, the method for producing the false twist textured yarn of the present invention will be described with reference to the drawings. FIG. 2 is a schematic diagram showing an example of the method for producing the false twist textured yarn of the present invention.

In the method for producing the false twisted yarn of the present invention, one of the constituents is made of polyethylene terephthalate as a main component and the other is made of polytrimethylene terephthalate as a main constituent after the polyurethane elastic fiber is drafted. Align with the side-by-side type or eccentric sheath / core type polyester-based composite fiber and perform false twisting.

In FIG. 2, the polyurethane elastic fiber 1 as the core yarn is rolled and actively fed by the yarn feeding roller 3.

From the viewpoint of preventing the elongation of the processed yarn from becoming small, the stretchability of the fabric being reduced, and the occurrence of yarn breakage in the false twisting process, positively fed polyurethane elastic fibers. 1 is preferably pre-drafted with the feed roller 4. The pre-draft is preferably in the range of 2 times or more and 4 times or less.

The polyurethane-based elastic fiber 1 and the polyester-based composite fiber 2 are aligned on the feed roller 4, and are temporarily twisted by the twisting body 6 between the feed roller 4 and the delivery roller 7 while being heated on the hot plate 5. The set is applied.
As the twisted body used for false twisting, any of a pin, a friction disc, and a belt may be used.

The number of false twists T (T / m) is represented by the following general formula (I) from the viewpoint of obtaining a sufficient crimp and preventing the occurrence of double twist which causes yarn breakage in the false twist process. It is preferable that the false twist coefficient K defined in () is set to 12000 or more and 32000 or less.

K = T × D ^1/2 (I) D: Fineness (dtex) of false twisted yarn From the viewpoint of sufficiently crimping, suppressing yarn breakage and fuzz due to heat deterioration of the fiber. Therefore, the false twisting temperature is preferably 140 ° C. or higher and 210 ° C. or lower.

The false twisted false twisted yarn is the delivery roller 7
After that, it is taken up by the take-up roller 8.

The knitted and woven fabric using the false twisted yarn of the present invention has elasticity, a bulky and flat appearance, and a soft and dry touch, and is particularly suitable for clothing such as tights, socks, and innerwear. Can be used for.

[0043]

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 through 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.

33 dtex polyurethane elastic fiber (LYCRA (R) type 12 manufactured by Toray DuPont Co., Ltd.)
7C) was used as a core yarn, the obtained polyester-based composite fiber was used as a sheath yarn, and false twisting was performed under the following conditions using the process shown in FIG. 2 to obtain a processed yarn.

Pre-draft of polyurethane elastic fiber: 3.0 Processing speed: 200 m / min (yarn speed on delivery roller 7) Draw ratio: 1.03 Twisted body: Friction disk (ceramic) False twist direction: S Number of false twists: 3680 T / m Heater: Hot plate (2.5 m) False twisting temperature: 190 ° C. Using the obtained false twisted yarn, knitted with a 28 gauge, single knitting machine, using a disperse dye for polyester As a result of dyeing and finishing, it has a bulky and flat appearance, has elasticity, has a dry touch, and has good stretchability,
A knitted fabric suitable for women's knits, tights and socks was obtained.

Further, a woven fabric was formed by using the obtained processed yarn as a weft yarn, followed by relaxing scouring with hot water at 97 ° C. and finish heat setting at 160 ° C. to obtain a 1/3 twill woven fabric.

The woven fabric using the processed yarn of the present invention has a bulky and flat appearance, has a soft and dry touch feeling, is excellent in elasticity, has good stretchability, and is suitable for women's clothing. there were.

[Example 2] 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
The undrawn yarn of 495 dtex 68 filament was obtained by taking it off at 00 m / min. Further, using a hot roll-hot plate stretching machine, hot roll temperature 70 ° C., hot plate temperature 145
Stretching was carried out at 0 ° C. and a draw ratio of 3.0 to obtain 165 dtex68 filament side-by-side type polyester conjugate fiber (stretched yarn).

Then, as in Example 1, a 56 dtex polyurethane-based elastic fiber (LY manufactured by Toray DuPont Co., Ltd.) was used.
CRA (R) type 127C) is used as a core yarn, the obtained polyester-based composite fiber is used as a sheath yarn, and false twisting is performed under the following conditions using the process shown in FIG. Got

Pre-draft of polyurethane elastic fiber: 3.0 Processing speed: 200 m / min (yarn speed on delivery roller 7) Draw ratio: 1.03 Twisted body: Friction disk (ceramic) False twisting direction: S False twist number: 2320 T / m Heater: Hot plate (2.5 m) False twist temperature: 195 ° C. The obtained false twist yarn is used as a weft to form a woven fabric,
Subsequently, the mixture was relaxed and scoured with hot water at 97 ° C., and finally heat-fixed at 160 ° C. to obtain 1/3 twill fabric. A woven fabric using the processed yarn of the present invention has a bulky and flat appearance, is rich in elasticity, resilience and resilience, has a soft and dry feeling, has good stretchability, and is suitable for an outerwear of medium-thickness Met.

[Comparative Example 1] The same 33 dtex polyurethane elastic fiber as that used in Example 1 was used as the core yarn,
Using 56 dtex24 filament polyethylene terephthalate stretched yarn as the sheath yarn, false twisting was performed under the following conditions in the same manner as in Example 1 to obtain a false twisted yarn.

Pre-draft of polyurethane elastic fiber: 3.0 Processing speed: 200 m / min (yarn speed on delivery roller 7) Draw ratio: 1.03 Twisted body: Friction disk (ceramic) False twisting direction: S False twist number: 3680 T / m Heater: Hot plate (2.5 m) False twisting temperature: 190 ° C. 28 gauge, 1 stitch using the obtained false twisted yarn and knitting with a knitting machine After knitting with a knitting machine, dyeing with a disperse dye for polyester, finishing processing, as a result,
The knitted fabric was poor in resilience, hard in texture, and poor in stretchability.

[Comparative Example 2] The same 33 dtex polyurethane-based elastic fiber as that used in Example 1 was used as the core yarn,
Using the above polyester-based composite fiber of 56tex24 filament as a sheath yarn, a covering process was performed under the following conditions to obtain a processed yarn.

Pre-draft of polyurethane fiber: 1.6 Total draft: 3.0 Twist number: S1000T / m Spindle speed: 13000 rpm Winding ratio: 93.0% Using the obtained processed yarn, 28 gauge, As a result of knitting with a single-pitch knitting machine, dyeing with a disperse dye for polyester, and finishing, the fabric is thin, lacks a flat feeling, has a repulsive feeling, but has a hard texture and lacks a soft touch. It was

[0057]

EFFECT OF THE INVENTION By using the false twisted yarn of the present invention, it is possible to obtain a stretch fabric having elasticity, bulkiness and flat appearance, and soft and dry touch.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of a false twist textured yarn of the present invention.

FIG. 2 is a schematic diagram showing an example of a method for producing a false twist textured yarn of the present invention.

[Explanation of symbols]

(B): Polyurethane elastic fiber (B): Polyester composite fiber (C): False twisted yarn 1: Polyurethane elastic fiber 2: Polyester composite fiber 3: Rolling yarn feeding roller 4: Feed roller 5: Hot plate 6: twisted body 7: Delivery roller 8: Take-up roller 9: False twisted yarn

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hironori Uranaka             1-2-2 Sonoyama, Otsu City, Shiga Prefecture             DuPont Co., Ltd. Shiga Plant F-term (reference) 4L036 MA04 MA05 MA15 MA17 MA33                       MA39 MA40 PA05 PA46 RA24                 4L041 AA07 BA02 BA05 BA09 BA22                       BB08 BD13 CA06 CA08 DD01                       DD10

Claims (6)

[Claims] 1. A false twist textured yarn comprising a core yarn and a sheath yarn,
A polyurethane-based elastic fiber is used for the core yarn, and one side component of the sheath yarn is polyethylene terephthalate as the main component and the other component is mainly polytrimethylene terephthalate.
A false twist textured yarn comprising a core type polyester-based composite fiber and false twisting. 2. The false twisted 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 in which one of the constituents contains polyethylene terephthalate as a main component and the other constituent contains polytrimethylene terephthalate as a main constituent after the polyurethane elastic fiber is drafted. A method for producing a false twist textured yarn, which comprises aligning a polyester-based composite fiber, which is a mold, and performing false twist. 4. The method for producing a false twist textured yarn according to claim 3, wherein the draft applied to the polyurethane elastic fiber is set to 2 times or more and 4 times or less. 5. The method for producing a false twisted yarn according to claim 3, wherein the false twisting temperature is 140 ° C. or higher and 210 ° C. or lower. 6. A false twist coefficient K defined by the following general formula (I):
Is 12000 or more and 32000 or less, The manufacturing method of the false twist textured yarn in any one of Claims 3-5 characterized by the above-mentioned. K = T × D ^1/2 (I) T: false twist number (T / m) D: fineness of false twist processed yarn (dtex)