JP2003073947A - Core spun yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a core spun yarn which has excellent durability, excellent chlorine resistance, excellent light resistance, good tension, and good stiffness, and can give a stretchable fabric having thin, flat and dry touches. SOLUTION: The core spun yarn comprising a core yarn and a sheath yarn is characterized by using a side-by-side type or eccentric sheath-core type polyester-based conjugate fiber yarn comprising polyethylene terephthalate as a main component and polytrimethylene terephthalate as another component as the core yarn and further using a polyethylene terephthalate yarn 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 Conventionally, a core-spun yarn obtained by pre-drawing a polyurethane fiber in a spinning process of spinning, aligning it with polyethylene terephthalate fiber, and spinning-twisting while drafting is generally used as a stretch material such as inner and outer. It has been widely used for clothing. Thus, when forming a knitted fabric with a core-spun yarn using polyurethane-based elastic fibers, it is possible to obtain a high level of stretchability, but the texture becomes hard and the drapeability decreases,
The drawback is that the fabric becomes thicker. Furthermore, in general, core-spun yarns using polyurethane-based elastic fibers are easily brittle due to chlorine due to the chemical structure of polyurethane elastic fibers,
It has a drawback that it is easily yellowed by light and gas, and technology to improve its durability against chlorine, light and gas, and yellowing resistance has been disclosed, but all of them are insufficient, and these drawbacks are improved. There is an urgent need to develop corespun yarns that can be made.

[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 fabric, has a flat feeling, and can obtain a stretch fabric 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 a polyethylene terephthalate fiber is used for a 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 polyethylene terephthalate fiber is used as a 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 as a core yarn is covered with a polyethylene terephthalate fiber (b) as a sheath yarn while being twisted. FIG. 2 is a schematic side view of the core-spun yarn (he) of the present invention, which has been treated with boiling water at 98 ° C. for 30 minutes under no load. By the boiling water treatment, the polyester-based composite fiber (d) which is the core yarn 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. It is bulky and rich in stretchability.

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 constituent components contains polyethylene terephthalate as a main component and the other constituent component contains polytrimethylene terephthalate as a main component. It is a polyester-based composite 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 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.

It is essential to use polyethylene terephthalate fiber as the sheath yarn of the core spun yarn of the present invention. If polyethylene terephthalate fiber is not used as the sheath yarn, there is a problem that a core-spun yarn excellent in morphological stability, heat setting property, elasticity and elasticity cannot be obtained.

The fineness of the sheath roving is 80 depending on the purpose of use.
The range of 0 decitex or more and 40,000 decitex or less is preferable, and the fineness of the sheath yarn after drafting is preferably 20 decitex or more and 1000 decitex or less.

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, during the spinning process, the roving yarn is drafted into the core yarn. 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 polyethylene terephthalate fiber are used. The polyester-based composite fibers are filament yarns, and the polyethylene terephthalate fibers are spun yarn rovings.

In FIG. 3, the polyester-based composite 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 polyethylene terephthalate fiber which is the sheath yarn 2 and the delivery roller 7 are aligned with each other. 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, it is preferable that the sheath yarn 2 which is a polyethylene terephthalate roving yarn is drafted 25 to 50 times before being aligned with the core yarn 1 by 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.

Further, the twist number in the fine spinning twist is such that after the fabric is formed and heat-treated, the covering property is sufficient to prevent the occurrence of eye-direction 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.

[0035]

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 polyethylene terephthalate 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 subjected to a tension of 0.01 cN / dtex or more before being aligned with the polyethylene terephthalate roving, which is a mating material, through a washer tensor,
The yarn was fed and drafted.

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, knitted on a 28 gauge, single-knitting machine, polyester As a result of dyeing with a disperse dye for use and finishing, a knitted fabric having excellent durability when worn, chlorine resistance and light resistance, a thin fabric, and a dry and soft feeling and good stretchability was obtained.

Further, a woven fabric was formed by using the obtained corespun yarn as a weft yarn, followed by relaxing scouring with hot water at 97 ° C. and final heat fixing at 160 ° C. to obtain a 1/3 twill woven fabric. The woven fabric using the yarn of the present invention was firm and firm, had a woolen texture, had an excellent surface feel, had a dry and soft touch, and had good morphological stability and stretchability.

Example 2 The same conditions as in Example 1 were used, except that the same side-by-side type polyester conjugate fiber of 55 dtex24 filaments used in Example 1 was used as the core yarn and polyethylene terephthalate roving yarn was used as the sheath yarn. Was spun and twisted to obtain a core spun yarn.

Tension 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, knitted with a 28 gauge, single-knitting machine, polyester As a result of dyeing with a disperse dye for finishing and finishing, we obtained a textured knitted fabric with excellent wear resistance, chlorine resistance, light resistance, thin fabric, dry and soft feeling and good stretchability. .

Further, a woven fabric was formed by using the obtained core spun yarn as a weft yarn, followed by relaxing scouring with hot water at 97 ° C. and final heat fixing at 160 ° C. to obtain a 1/3 twill woven fabric. The woven fabric using the yarn of the present invention was a woven fabric suitable for high-grade kimono applications, having an elegant texture, a woolen texture, a dry and soft touch, and good stretchability.

[Comparative Example 1] Example 1 using 20 dtex polyurethane yarn and polyethylene terephthalate roving yarn
In the same manner as above, fine spinning and twisting was performed under the following conditions to obtain a core spun yarn. However, as shown in Figure 3,
Rolling was performed, and only the polyurethane yarn was drafted between the yarn feeding roller and the delivery roller, and then finely spun and twisted in alignment with the polyethylene terephthalate roving.

Draft of polyurethane elastic fiber: 3.7 Draft of roving: 40 Number of twists: Z300 T / m Using the obtained plied yarn, knitted with a 28 gauge, single knitting machine in the same manner as in Example 1. As a result of dyeing and finishing with a disperse dye for polyester, a knitted fabric having a high level of elasticity but poor durability when worn, chlorine resistance and light resistance, a thick fabric, and a hard texture was obtained.

Further, the obtained corespun yarn was used as a weft yarn to form a woven fabric, followed by relaxing scouring with hot water at 97 ° C. and final heat fixing at 160 ° C. to obtain a 1/3 twill woven fabric. The obtained woven fabric was rich in elasticity, but had a hard texture.

[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.

Tension: 4 g Draft: 1.1 times Twist number: Z1400 T / m Spindle speed: 10000 rpm Winding ratio: 95.0% The obtained core-spun yarn was knitted on a 28 gauge, single-knitting machine. As a result of scouring and finishing, the same stretchability as in Example 1 was obtained, but light resistance, firmness,
The knitted fabric was inferior in elasticity and morphological stability, and a satisfactory knitted fabric could not be obtained.

[0048]

EFFECTS OF THE INVENTION According to the present invention, it has excellent durability, chlorine resistance and light resistance, is firm and firm, has a thin cloth, and has a dry feeling.
It is possible to provide a core-spun yarn capable of obtaining a stretch fabric having a soft feeling.

[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 method for producing a core spun yarn of the present invention.

[Explanation of symbols]

(A): Polyester composite fiber (B): Polyethylene terephthalate fiber (C): Core spun yarn (D): Polyester composite fiber (E): Polyethylene terephthalate fiber (F): Core spun yarn 1: Core thread 2: sheath yarn 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 Hironori Uranaka             1-2-2 Sonoyama, Otsu City, Shiga Prefecture             DuPont Co., Ltd. Shiga Plant F-term (reference) 4L036 MA05 MA15 MA17 MA39 PA46                       RA03 RA04 RA24 UA01 UA08

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 a polytrimethylene terephthalate as a main component. An eccentric sheath / core type polyester-based composite fiber is used, and a polyethylene terephthalate 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, which comprises using polyethylene terephthalate fiber as a sheath yarn.