JP2003221742A - Covered yarn and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a covered yarn capable of affording a thin stretchable fabric having a flat touch, a soft touch feeling and a refreshing touch unique to cotton and a woollen touch feeling and a method for producing the covered yarn. <P>SOLUTION: This covered yarn comprises a core yarn and a sheath yarn and is obtained by using polyester conjugated fibers of the side-by-side type or the eccentric sheath-core type comprising one of constituent components consisting essentially of polyethylene terephthalate and the other constituent component consisting essentially of polytrimethylene terephthalate as the core yarn and cotton fibers as the sheath yarn. The method for producing the covered yarn is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

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

More specifically, using the coated yarn of the present invention,
To obtain a stretched fabric that has a thin and flat feeling, has a soft feeling peculiar to cotton, has a wooly texture, and has a touch with a refreshing and refreshing feeling by being subjected to high-order processing and used for clothes. And a method for producing the same.

[0003]

2. Description of the Related Art Conventionally, in order to impart stretchability to cotton fibers, polyurethane-based elastic fibers and cotton fibers are interwoven or woven, or polyurethane-based elastic fibers are covered with cotton.
Alternatively, a twisted twist has been used. However, the knitted fabric obtained by such a method can have excellent fit and stretchability, but the texture becomes hard,
Since the drapeability deteriorates and the cloth becomes thick, it is not possible to obtain sufficient characteristics as a clothing material for spring and summer to satisfy the consumer's requirements.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a soft, wooly texture, thin fabric and flat feeling, which cannot be obtained by the prior art, when it is subjected to higher-order processing and used for clothes or the like. Another object of the present invention is to provide a coated yarn that can obtain a stretch cloth having a refreshing touch and a method for producing the same.

[0005]

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

That is, a covering yarn consisting of a core yarn and a sheath yarn, wherein one of the constituent components of the core yarn is mainly composed of polyethylene terephthalate and the other constituent component is mainly composed of polytrimethylene terephthalate. An eccentric sheath / core type polyester composite fiber is used, and a cotton yarn is used as a sheath yarn, which is a covered yarn.

Further, the method for producing a coated yarn of the present invention adopts 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. It is a method for producing a coated yarn, which comprises using a cotton fiber as a sheath yarn from the above and using it.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The coated yarn of the present invention will be described below. FIG. 1 is a schematic side view showing an example of the coated yarn of the present invention. The coated yarn (c) is wound around the polyester-based composite fiber (a), which is a core yarn, with a cotton fiber (b), which is a sheath yarn, in a single or double twist. FIG. 2 shows 98
FIG. 3 is a schematic side view of the coated yarn (f) of the present invention, which has been subjected to boiling water treatment in an unloaded state for 30 minutes at 0 ° C. The polyester-based composite fiber (d), which is the core yarn, is subjected to boiling water treatment to develop latent crimps, and the present invention provides a covered yarn that is bulky and rich in stretchability.

The core yarn in the coated 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.

Since the polymers having different intrinsic viscosities are adhered 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 coated yarn of the present invention, preferably comprises a polymer component having a polyethylene 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 necessary, titanium dioxide serving as a matting agent, fine particles of silica or alumina serving as a lubricant, hindered phenol derivative serving as an antioxidant, and a coloring pigment may be added. The polytrimethylene terephthalate, which is another constituent component of the core yarn in the coated yarn of the present invention, is preferably a polymer component containing 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.

The cotton fibers used as the sheath yarn in the coated yarn of the present invention include long-fiber cotton such as Egyptian cotton, Sudan cotton, Peruvian cotton, and sea-island cotton, medium-fiber cotton such as Upland cotton,
Short fiber cotton such as deshi cotton is preferred. The fiber length, count, etc. may be appropriately selected in consideration of the appearance, texture, elasticity of the resulting knitted fabric, and the fiber length is 20 mm or more and 40 mm or more.
The following range is preferable. The fineness is preferably in the range of 20 decitex or more and 1000 decitex or less.

The coated yarn of the present invention may be a single coated yarn or a double coated yarn. With the single-cover yarn, a yarn having excellent stretchability can be obtained, and with the double-cover yarn, the covering property becomes good.

Next, the method for producing the coated yarn of the present invention will be described. FIG. 3 is a schematic diagram showing an example of the method for producing a coated yarn of the present invention.

In the present invention, the polyester-based composite fiber is used as the core yarn, and the cotton fiber which is the sheath yarn is coated thereon.

A commercially available covering machine or the like is preferably used for coating.

FIG. 3 shows an example of a double coated yarn. In FIG. 3, the polyester-based conjugate fiber used as the core yarn 1 is
From the viewpoint of obtaining a stable draft and preventing the occurrence of yarn breakage because it has a coil-shaped actual crimp, stabilizes the balloon of the sheath yarn 2, suppresses Yorimura in the yarn length direction, and slab-like processing. From the viewpoint of preventing the formation of yarn, pretension is applied between the feed roller 4 and the washer tensor 3 immediately before being inserted into the draft zone between the feed roller 4 and the delivery roller 11 of the covering machine. preferable. Such pretension is 0.01
It is preferably at least cN / dtex. As a method of pretensioning the core yarn, the washer tensor 3 is used in FIG. 3, but a magnet tensor or the like is also preferably used.

While the core yarn is pretensioned with 0.01 cN / dtex or more, the running of the core yarn is stabilized,
From the viewpoint of preventing yarn breakage, damage to the rubber roller in drafts, uneven drawing due to slipping of yarn between drafts, and yarn breakage, the draft is preferably in the range of 0.95 or more and 1.6 or less, It is more preferable that the range is 1.03 or more and 1.2 or less.

The sheath yarn is made of H by a commercially available high-speed winder.
After being wound on the bobbin 9, it is installed on the lower spindle 5 and the upper spindle 7 as shown in FIG. 3, and is wound on the core yarn by rotating the spindles to form a coated yarn.

The obtained coated yarn is taken up by the take-up roller 1.
It is wound on cheese 14 by 3.

When producing the single-coated yarn, one H bobbin is installed on either the upper spindle or the lower spindle, and the spindle yarn is wound around the core yarn by rotating the spindle.

When the sheath yarn is coated on the core yarn, the twist number of the sheath yarn may be appropriately selected depending on the fineness of the sheath yarn and the number of filaments, but is preferably in the range of 100 to 2000 T / m.

In the case of double coating, the number of upper twists is preferably 0.7 to 0.9 times the number of lower twists, and in order to cancel the torque, the upper twists of the lower twists are It is preferable to apply in the opposite direction.

The knitted fabric using the coated yarn of the present invention has an elegant woolen appearance, a soft texture, and a refreshing feeling, and is excellent in stretchability and shape stability. Particularly, it is used for clothing such as jackets, suits, and Outerwear such as bottoms, dresses,
It can be used as women's clothing such as skirts, and stretch materials such as shirts, nightwear, baby clothing, underwear, tights and socks.

[0036]

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. Using the obtained polyester-based composite fiber as a core yarn and 80s Upland cotton yarn as a sheath yarn,
Using the covering process shown in FIG. 3, the covering process was performed under the following conditions.

The core yarn has a pretension of 0.01 cN / dtex or more between the washer tensor 3 and the feed roller 4 immediately before being inserted into the draft zone between the feed roller 4 and the delivery roller 11 of the covering machine. The yarn was fed through the washer tensioner so that

Pretension: 4 g Draft: 1.1 times Twist number: Z1400 T / m Spindle speed: 8000 rpm Winding ratio: 95.0% Using the obtained single coated yarn, 28 gauge, with a single knitting machine As a result of knitting, mix dyeing with disperse dye and direct dye, and finish processing, it has an elegant and wooly appearance, the fabric has a thin and flat feeling, no wrinkles and wrinkles, and a soft touch A knitted fabric having good properties was obtained.

Further, a woven fabric was formed by using the obtained single-coated yarn as a weft yarn, followed by relaxing refining with hot water at 97 ° C. and finish heat setting at 160 ° C. to obtain a taffeta woven fabric.
The woven fabric using the coated yarn of the present invention had excellent drapeability, beautiful luster and appearance, soft feeling, stretchability and morphological stability.

Example 2 The same 56dtex24 filament side-by-side type polyester-based composite fiber used in Example 1 was used as the core yarn and 80s as the sheath yarn.
Using an upland cotton yarn, a covering process was performed under the same conditions as in Example 1 to obtain a double-coated yarn.

Pretension: 4 g Draft: 1.1 times Lower twist number: S800 T / m Upper twist number: Z680 T / m Spindle rotation number: 8000 rpm Winding ratio: 96.0% Using the obtained double coated yarn , As in Example 1, 28
As a result of knitting with a gauge, a single-pitch knitting machine, dyeing with a disperse dye and a direct dye, and finishing, the fabric had a thin and flat feel, a soft touch, and excellent stretchability, and a knitted fabric suitable for underwear was obtained. Although the stretchability was slightly reduced as compared with Example 1, the knitted fabric had a flatter and more beautiful appearance and a refreshing feeling because of good coverage.

Further, a woven fabric was formed by using the obtained double-coated yarn as a weft yarn, followed by relaxing refining with hot water at 97 ° C. and finish heat setting at 160 ° C. to obtain a taffeta woven fabric.
A woven fabric using the coated yarn of the present invention was rich in resilience, had a soft feeling, and had good stretchability, and a woven fabric suitable for a shirt fabric was obtained.

[Comparative Example 1] Using a polyurethane elastic fiber of 20 dtex as a core yarn and an upland cotton yarn of 80 s as a sheath yarn, a covering process was performed under the following conditions in the same manner as in Example 1 to obtain a single coated yarn. It was However, the polyurethane yarn was supplied by rolling (positive feed).

Draft: 3.0 times twist number: Z1000T / m Spindle speed: 8000 rpm Winding ratio: 93.0% Using the obtained single coated yarn, 28
As a result of knitting with a gauge, a single-pitch knitting machine, dyeing with a direct dye, and finishing, as a result, a knitted fabric having a high level of elasticity but a thick fabric and a hard texture was obtained.

Further, a woven fabric was formed by using the obtained single-coated yarn as a weft yarn, followed by relaxing refining with hot water at 97 ° C. and finish heat setting at 160 ° C. to obtain a taffeta woven fabric.
The obtained woven fabric was highly stretchable, but the woven fabric was thick and had a hard texture.

[Comparative Example 2] Comparative Example 1 using a 20 dtex polyurethane-based elastic fiber as a core yarn and a 56 dtex 24 filament 80s upland cotton yarn as a sheath yarn.
In the same manner as above, covering was performed under the following conditions to obtain a double-coated yarn.

Draft: 3.0 times Lower twist number: S800T / m Upper twist number: Z680T / m Spindle speed: 8000 rpm Winding ratio: 95.0% Using the obtained double coated yarn, Example 1 28 as well as
As a result of knitting with a gauge, a single-pitch knitting machine, dyeing with a direct dye, and finishing, as a result, a knitted fabric having a high level of elasticity but a thick fabric and a hard texture was obtained.

Comparative Example 3 The same side-by-side type polyester conjugate fiber of 56 dtex24 filament as that used in Example 1 was used as the core yarn, and 1/80 wool yarn was used as the sheath yarn. The covering process was performed under the conditions of 1. to obtain a single-coated yarn.

Pretension: 4 g Draft: 1.1 times Twist number: Z800 T / m Spindle speed: 8000 rpm Winding ratio: 95.0% Using the obtained single coated yarn, 28
As a result of knitting with a gauge, a single knitting machine, mixed dyeing with a disperse dye for polyester and an acid dye, and finishing, as a result, it was possible to obtain the desired stretchability, but it is bulky, the fabric is thick, and it lacks a refreshing feeling. The knitted fabric had a soft feel.

[0052]

EFFECTS OF THE INVENTION By using the coated yarn of the present invention, a stretched cloth having a thin and flat feeling and a soft feeling, a refreshing feeling and a woolen texture peculiar to cotton can be obtained.

[Brief description of drawings]

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

FIG. 2 is a schematic side view showing an example of the coated yarn of the present invention which has been subjected to boiling water treatment in a no-load state.

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

[Explanation of symbols]

(A): Polyester composite fiber (B): Cotton fiber (C): Coated yarn (D): Polyester composite fiber (E): Cotton fiber (F): Coated yarn 1: Core thread 2: sheath yarn 3: Washer tensor 4: Feed roller 5: Lower spindle 6: Lower belt 7: Upper spindle 8: Upper belt 9: H bobbin 10: Snell guide 11: Delivery roller 12: Guide bar 13: Take-up roller 14: cheese

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenro Kamiya             1-2-2 Sonoyama, Otsu City, Shiga Prefecture             DuPont Co., Ltd. Shiga Plant F-term (reference) 4L036 MA04 MA09 MA15 MA33 MA39                       PA12 RA24 UA01

Claims (5)

[Claims] 1. A covering 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 cotton yarn is used for the sheath yarn, which is a covered yarn. 2. The coated 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 coated yarn, which comprises using a cotton fiber as a sheath yarn from above. 4. The method for producing a coated yarn according to claim 3, wherein the sheath yarn is coated once. 5. The method for producing a coated yarn according to claim 3, wherein the sheath yarn is doubly coated.