JP2003119633A - Covered yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covered yarn capable of providing a stretch fabric having a thin thickness, flat feeling, excellent water-absorbing and quickly dried properties, cool feeling peculiar to linen, and dry touch feeling, and further to provide a method for producing the covered yarn. SOLUTION: This covered yarn is composed of a core yarn and a sheath yarn. The core yarn comprises a side-by-side type or an eccentric sheath-core type polyester-based conjugate fiber consisting of one component consisting essentially of a polyethylene terephthalate, and the other component consisting essentially of a polytrimethylene terephthalate. The sheath yarn is composed of a hemp fiber.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coated yarn.

More specifically, using the coated yarn of the present invention,
By high-order processing and using it for clothes, etc., the fabric is thin, has a flat feeling, is excellent in cooling feeling and shape stability,
TECHNICAL FIELD The present invention relates to a coated yarn capable of obtaining a stretch fabric having elasticity and a dry feel, and a method for producing the same.

[0003]

2. Description of the Related Art Conventionally, in order to impart stretchability to hemp products, polyurethane elastic fibers and hemp fibers have been knitted, woven or 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. It was not possible to obtain sufficient characteristics satisfying the above conditions. Further, in general, polyurethane-based elastic fiber has a drawback that it is easily embrittled by chlorine due to its chemical structure and is easily yellowed by light or gas, and thus has improved durability against chlorine, light or gas and yellowing resistance as compared with conventional ones. Although the technology has been disclosed, it is insufficient and development of a textured yarn capable of improving these defects is urgently needed.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention, when it is subjected to high-order processing and used for clothes or the like, the cloth which has not been obtained by the prior art is thin, has a flat feeling, and has a refreshing feeling and a stable shape It is an object of the present invention to provide a coated yarn capable of obtaining a stretch fabric having excellent elasticity, elasticity and elasticity, and a dry 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 hemp fiber is used as a sheath yarn, which is a covering 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. A method for producing a coated yarn, which comprises using the hemp fiber as a sheath yarn and covering it from above.

[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 twisted around the polyester-based composite fiber (A) which is a core yarn by a hemp fiber (B) which is a sheath yarn in a single or doubled manner. 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 a no-load state at 30 ° C. for 30 minutes. When the polyester-based composite fiber (d) as the core yarn is treated with boiling water, latent crimps are developed, and the coated yarn of the present invention becomes 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.

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 that the above polyester-based composite fiber was 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 bent at 90 degrees).
Furthermore, because the density of constraint points due to the interaction (stacking, parallel) between benzene rings is low and the flexibility is high, it is considered that the molecular chain is easily extended and recovered by the rotation of the methylene group.

The polyethylene terephthalate, which is a constituent component of the core yarn in the coated 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, terephthalic acid is the main acid component, and ethylene glycol is the main glycol component.
The polyester obtained as a component is preferred. However, it is also preferable that the content of other copolymerizable component capable of forming an ester bond is 20 mol% or less.
Those contained in the following ratios are more preferable. Examples of the copolymerizable compound include 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. , Dicarboxylic acids such as azelaic acid, dimer acid, adipic acid, oxalic acid, and decanedicarboxylic acid; dicarboxylic acids such as p-hydroxybenzoic acid and hydroxycarboxylic acids such as ε-caprolactone;
Triethylene glycol, polyethylene glycol, propanediol, butanediol, pentanediol,
Diols such as 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.

The polytrimethylene terephthalate, which is another component of the core yarn of the coated 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.

In the present invention, 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.

It is indispensable to use hemp fiber for the sheath yarn in the coated yarn of the present invention. If hemp fiber is not used for the sheath yarn, it is not possible to achieve a water-absorbing property and a quick-drying property when knitted into a knitted fabric, and to realize a refreshing touch and a dry touch.

Hemp fibers used as sheath yarn are ramie,
There are linen, cannabis, jute, Manila hemp, sisal, jute, and the like, which may be appropriately selected depending on the application. They are,
It is preferable that the yarn is stable and easy to twist.

The fineness of the sheath yarn is s10 depending on the purpose of use.
A range of s100 is preferred.

In the coated yarn of the present invention, the sheath yarn may be a single coating around the core yarn from the viewpoint of obtaining excellent stretchability, and the sheath yarn may be formed from the viewpoint of obtaining excellent covering properties. The core yarn may be double-coated.

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 hemp fiber is coated thereon as the sheath yarn.

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

FIG. 3 shows an example of double coating. 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 yarn from being formed, between the washer tenser 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, 0.01 cN / dtex is applied.
It is preferable to apply the above pretension. As a method of pretensioning the core yarn, see FIG.
In the above, the washer tensor 3 is used, 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 2, 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 spindle 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 number of twists of the sheath yarn may be appropriately selected depending on the count of the sheath yarn, but is 100 to 100.
It is preferably in the range of 2000 T / m.

In the case of double coating, it is preferable that the number of upper twists is 0.7 to 0.9 times the number of lower twists. It is preferable to apply in the opposite direction.

The knitted fabric using the coated yarn of the present invention has a flat appearance, is excellent in water absorption, quick-drying, and firmness / resilience, has a refreshing feel and a dry feel, and is particularly suitable for clothing. It can be used for a wide range of applications such as jackets, summer suits, outerwear such as bottoms, shirts, and other materials such as duvet covers, pillowcases, and sheets.

[0039]

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 composite fiber as a core yarn and s80 linen yarn as a sheath yarn, a covering process was performed under the following conditions using the covering process shown in FIG. The core yarn is subjected to a pre-tension of 0.01 cN / dtex or more between the washer tenser 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. Then, the yarn was fed through the washer tensor.

Pre-tension: 4 g Draft: 1.1 times Twist number: Z400 T / m Spindle speed: 4000 rpm Winding ratio: 95.0% Using the obtained single-coated yarn, 28 gauge, 1-knitting machine As a result of knitting, scouring, and finishing, the fabric has a thin, flat appearance, is firm and elastic, has excellent water absorption and quick drying properties, has a refreshing feeling, a dry feel, and has good stretchability. Thus, a knitted fabric suitable for outerwear and a shirt was obtained.

[Example 2] The same side-by-side type polyester composite fiber of 56 dtex24 filaments used in Example 1 was used as the core yarn and s80 as the sheath yarn.
Using the ramie yarn of No. 2, covering treatment was performed under the following conditions in the same manner as in Example 1 to obtain a double-coated yarn.

Pretension: 4 g Draft: 1.1 times Lower twist number: S400 T / m Top twist number: Z340 T / m Spindle speed: 4000 rpm Winding ratio: 96.0% Using the obtained double coated yarn , As in Example 1, 28
As a result of knitting with a gauge and a single knitting machine, scouring and finishing, the fabric is slightly thicker than in Example 1, but has a flatter and elegant appearance, good stretchability, and outerwear. A knitted fabric suitable for a shirt was obtained.

[Comparative Example 1] A 20 dtex polyurethane-based elastic fiber was used as a core yarn, and s80 linen yarn was used as a sheath yarn, and a covering process was performed under the following conditions in the same manner as in Example 1 to obtain a single-coated yarn. . However, the polyurethane-based elastic fiber was fed by rolling (feeding positively).

Draft: 3.0 times twist number: Z400T / m Spindle rotation number: 4000 rpm Winding ratio: 93.0% Using the obtained single coated yarn, the same as in Example 1, 28
As a result of knitting with a gauge and a single knitting machine, scouring and finishing, a knitted fabric having a high level of elasticity but a thick fabric and a hard texture was obtained.

[Comparative Example 2] Using polyurethane elastic fibers of 20 dtex as the core yarn and s80 ramie yarn as the sheath yarn, the covering process was carried out under the following conditions in the same manner as in Comparative Example 1 to obtain a double coated yarn. It was

Draft: 3.0 times Lower twist number: S400T / m Upper twist number: Z340T / m Spindle rotation number: 4000 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 and a single knitting machine, scouring and finishing, a knitted fabric having a high level of elasticity but a thick fabric and a hard texture was obtained.

Comparative Example 3 The same 56dtex24 filament side-by-side type polyester composite fiber used in Example 1 was used as the core thread and 56d as the sheath thread.
A covering process was performed under the following conditions in the same manner as in Comparative Example 1 using polypropylene yarn of tex24 filament.

Pre-tension: 4 g Draft: 1.1 times Twist number: Z800 T / m Spindle speed: 10000 rpm Winding ratio: 95.0% Using the obtained single coated yarn, 28 gauge, 1 knitting machine As a result of knitting, scouring and finishing, the stretchability was similar to that of Example 1, but a knitted fabric having desired water absorbency, quick drying property, refreshing feel and dry feel was not obtained.

[0051]

EFFECTS OF THE INVENTION By using the coated yarn of the present invention, the stretch fabric has a thin fabric, has a flat feeling, firmness and elasticity, is excellent in water absorption and quick-drying, and has a unique refreshing feeling and dry touch feeling unique to hemp. 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): Hemp fiber (C): Coated yarn (D): Polyester composite fiber (E): Hemp fiber (F): Coated yarn 1: Polyester composite fiber 2: hemp fiber 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 MA05 MA08 MA15 MA17 MA33                       MA35 MA37 MA39 PA01 PA21                       PA46 RA24 UA07

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 hemp fiber is used as a sheath 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 covered yarn, which comprises using the hemp fiber as a sheath yarn and covering it 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.