JPH09111538A - Polyester sheath-core conjugated fiber yarn and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the multicolor expression of different hues and densities in a polyester fiber. SOLUTION: This conjugated fiber has either of two kinds of polyesters, different in dyeability and arranged in a sheath part and the other arranged in a core part, thick and thin parts in the fiber axial direction and further tangled parts of 3-150 tangles/m in the fiber axial direction. The conjugated fiber is obtained by carrying out the interlacing treatment of an undrawn conjugated fiber yarn having either of the two kinds of polyesters different in dyeability as the sheath component and the other as the core component with air, then performing the semidrawing treatment of the resultant fiber and forming the thick and thin parts in the fiber axial direction.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyester sheath core composite fiber yarn and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a means of multicolor expression of textile products, cotton fibers are dyed in a cotton-like manner, and fibers having different hues and densities are mixed by blending or blending, or yarn-dyed fibers are blended and twisted. , Mixed weaving, knitting, or mixing original yarns or fibers with different dyeing properties and then dyeing to create a multi-colored expression such as cine, melange, or chambray, or stone wash or bleach. It is obtained by special processing such as fibrillation or ring-dyeing of only the fiber surface layer, which has been partially decolorized by physical or chemical treatment, etc. There are problems such as complexity, high cost, and a large processing lot.

[0003] As a means for multicoloring the fibers themselves, there is a thin fiber which gives a marbling effect. Then, as such a thick and thin fiber, a sheath core composite fiber having a thinness and a thinness obtained by spinning a sheath core composite fiber with two components having different dyeability, and stretching this under a condition giving a thickness The parts to be arranged in the parts are disclosed in JP-A-55-116812 and JP-A-55-16819.

However, the conventionally known thick and thin composite fibers have their dyeing properties mainly dependent on the dyeing properties of the polymer of the thick part and the sheath part of the detail, and are sufficiently expressed to satisfy the dyeing properties of the core part. However, the marbling effect due to the dyeing density was not sufficient, and the variety was lacking.

[0005]

DISCLOSURE OF THE INVENTION As a result of studies on thick and thin sheath core composite fiber yarns, the present invention provides polyester sheath core composite fiber yarns which have not been known at all and have a wide variety of multicolor expression effects. The present invention has been found, and an object of the present invention is to provide a polyester sheath core composite fiber yarn exhibiting a multicolor expression effect of different hues and different densities.

[0006]

According to the present invention, one of two kinds of polyesters having different dyeing properties is arranged in a sheath part and the other is arranged in a core part, and a composite fiber having a large and small thickness along the fiber axis direction. And a polyester sheath core composite fiber yarn characterized by having entangled portions of 3 to 150 entanglements / m, and one of two types of polyesters having different dyeability Using a composite fiber yarn obtained by air-entanglement of an unstretched composite fiber yarn having the other component as the core component, or one of two polyesters having different dyeability as a sheath component and the other as the sheath component. A polyester sheet characterized by forming a thin or thick fiber in the fiber axis direction by performing a semi-stretching treatment using an unstretched conjugate fiber yarn obtained by spinning a conjugate fiber as a core component while air-entanglement treatment. Score composite fiber The conditions method of manufacturing the gist.

[0007] 2 constituting the seed core composite fiber of the present invention
Different kinds of polyesters have different dyeing properties. One is a modified polyester which is dyeable to cationic dyes or acidic dyes or has an easy dyeability to disperse dyes, and the other is non-dyable to cationic dyes or acidic dyes. Unmodified polyesters having non-ease dyeability with respect to the disperse or disperse dyes are typical polyesters. Further, a combination of a modified polyester having a large modification degree and a modified polyester having a small modification degree may be used. Alternatively, the modified polyester may be arranged in the sheath part and the modified polyester of another kind may be arranged in the core part. However, it is preferable to use the modified polyester which is dyeable with a cationic dye, acid dye or disperse dye. First, unmodified polyester is placed in the core.

The modified polyester is a polyester which has ethylene terephthalate as a main repeating unit and is modified to be dyeable or easily dyeable, and the unmodified polyester is a polyester which has ethylene terephthalate or butylene terephthalate as a main repeating unit. As the modified polyester, a modified polyester which is dyeable with a cationic dye, dyeable with an acid dye, or easily dyeable with a disperse dye is used. It is preferred that the polyester be disposed in the core.

As the cationic dye dyeable modified polyester, ethylene terephthalate obtained by a known method is copolymerized with an acid group-containing ester forming compound such as a metal salt sulfonate group such as sodium sulfoisophthalic acid and sodium sulfonaphthalenedicarboxylic acid. The modified polyester, preferably a modified polyester obtained by copolymerizing ethylene terephthalate with 1.5 to 3.5 mol% of 5-sodium sulfoisophthalic acid is used.

As the acid dye dyeable modified polyester, ethylene terephthalate obtained by a known method is used together with an amino alcohol such as N-alkyl-substituted diethanolamine and a base-containing ester-forming compound such as a tertiary amino-containing glycol. Polymerized modified polyester, modified polyethylene terephthalate with a homopolymer or copolymer of vinyl pyridine is used.

Further, as the disperse dye easily dyeable modified polyester, a modified polyester obtained by copolymerizing ethylene terephthalate obtained by a known method with an ester-forming compound such as isophthalic acid, adipic acid or polyoxyalkylene glycol is used.

Examples of the unmodified polyester include polyethylene terephthalate and polybutylene terephthalate. The unmodified polyester may contain less than 5 mol% of a copolymerization component or a blending component, and particularly preferably polyethylene terephthalate. Is used.

The sheath core composite fiber yarn of the present invention has 3 to 150 entangled portions / m in the fiber axis direction. Further, it is preferable that the entangled portion constitutes a thick portion and the non-entangled portion constitutes a detail, and the variation coefficient CV of the thickness unevenness of the entire yarn is 7 to 15%.

The entangled portion forms a thick portion, the non-entangled portion forms a thin portion that constitutes a detail, and the variation coefficient CV of the thickness unevenness of the yarn as a whole shows 7 to 15%. The exposed portion of the core portion of all the constituent filaments is limited due to the weight reduction, and clearer multicolor expression is possible.

When the coefficient of variation CV is less than 7%, the entanglement of each fiber is insufficient, the thick part is dispersed, the core part becomes inconspicuous, and the multi-color dyeing or dyeing density is caused in the dyeing after the alkali reduction treatment. Even if the marbling effect is obtained,
It becomes difficult to obtain a clear multicolor expression. On the other hand, if it exceeds 15%, unnatural spots are formed, and the quality tends to be poor.

Here, the variation coefficient CV of the thickness unevenness is the EVENESTESTER (KET-80) manufactured by Keisokuki Kogyo Co., Ltd.
C), yarn speed 8m / min, chart speed 50c
It is a value obtained by measuring the Worcester normal value under the condition of m / min, and serves as an index showing the magnitude of deviation from the average value.

If the number of entangled parts exceeds 150 / m, the dyeing property of the details tends to be unclear, and conversely if it is less than 3 / m, the coloring property of the thick part becomes unclear. It is difficult to obtain the color effect.

Here, the number of interlaced parts is determined by ROTSCH
ILD MESSINSTRUMENTE automatic yarn entanglement tester (Needle Pul)
1Tester R-2040) and the value obtained under the conditions of the trip level tension shown by the following formula.

[Trip level tension = (D × 0.
2) + D / F + vibration width] (where D is the denier of the yarn bundle, F is the number of filaments constituting the yarn bundle, and the vibration width is D × 0.02.) The composite ratio of the sheath portion and the core portion in the cross section is preferably 1/3 to 1/1 in terms of the area ratio of the sheath portion / core portion. When the thickness of the sheath portion is too small, the coloring with the dye becomes lighter, and when the thickness is too large, it becomes difficult to obtain a thick and thin portion, and it becomes difficult to secure strength at the time of exposing the core portion.

The cross-sectional shape of the sheath core conjugate fiber of the present invention may be any of a round cross section, a triangular cross section, a multilobe section, and an atypical cross section such as a flat section, and the shape, number and position of the core are not particularly limited. Not done.

The sheath core conjugate fiber of the present invention has a thickness called so-called thick and thin in which the fineness is changed in the fiber axis direction, and at least the entire core portion of the thick sheath core composite fiber is present. Or part of it is exposed. From the viewpoint of multicolor expression, it is preferable to expose a part of the thick core portion rather than to expose the entire thick core portion, but the degree of exposure of the thick core portion is appropriately selected according to the purpose. Further, the core portion other than the thick portion may be exposed if necessary, but it is preferable to limit the exposure to a part of the core portion other than the thick portion.

Further, in the sheath core composite fiber of the present invention, the sheath portion and the exposed core portion and the thick portion and the details may be colored in different colors, and the coloring constitutes the sheath portion and the core portion, respectively. Based on the dyeability of the polyester to be used, the darkness of the thick part, any hue such as cationic dye and disperse dye, acid dye and disperse dye, or disperse dye and disperse dye,
It is expressed in multiple colors by combining shades. For example, in dyeing, the sheath part is colored with a cationic dye, the thick part is colored with a cationic dye, and the exposed core part of the thick part is colored with a disperse dye in a different color from the cationic dye, or with only the cationic dye. Various coloring effects are provided, such as whitening of the exposed core.

The polyester sheath core composite fiber yarn of the present invention is preferably manufactured as follows. The polyester used in the production method of the present invention is a combination of modified and unmodified polyesters having different dyeability,
Modified polyester in the sheath, unmodified polyester in the core, modified polyester with a high degree of modification in the sheath, modified polyester with a low degree of modification in the core, or modified polyester in the sheath, and other types of modification The polyester is used as the core portion, preferably, the modified polyester which is dyeable with a cationic dye or an acid dye or easily disperse dye is placed in the sheath portion, and the unmodified polyester is placed in the core portion to form a composite spinning in a sheath core type. To do.

An unstretched sheath core type composite structure obtained by composite spinning of the sheath part and the core part, preferably in a composite ratio such that the area ratio of the sheath part / core part is 1/3 to 1/1. After the yarn is air-entangled, a semi-stretching process is performed to obtain thick and thin fibers.

In order to form a good thickness difference as the unstretched composite fiber yarn to be used, the spinning speed is 1000 to 2
The undrawn yarn obtained under the condition of 500 m / min is preferable, and as the air entanglement treatment, the injection pressure is 3 to 6 kg / cm ² by a known high pressure air injection nozzle.
It is preferable to carry out the confounding treatment with

When the spinning speed is less than 1000 m / min,
Although the natural stretching area is large and a good difference in thickness can be obtained,
Since the thick portion has a low orientation, the rupture strength after heat treatment is remarkably reduced, and the quality and process stability are impaired.
When it exceeds m / min, the naturally stretched region becomes small and a good difference in thickness cannot be obtained.

Further, if the air pressure is less than 3 kg / cm ² , the entanglement between the filaments constituting the yarn bundle is insufficient and the positions of the thick portions of the filaments are dispersed, resulting in a clear multicolor image. Unable to get the expression, 6kg / cm ²
If it exceeds the range, not only the entanglement form becomes poor, but also the filament is greatly damaged, which causes a yarn breakage or the like.

In order to obtain thick and thin fibers, the undrawn composite fiber yarn obtained as described above is semi-drawn. For example, a non-stretched composite fiber yarn is prepared by using a fiber having a stretch ratio of about half of the maximum stretch ratio of the fiber, preferably 0.45-0.6 of the maximum stretch ratio.
Semi-stretching, preferably stretching is divided into two stages and two stages are stretched at a magnification of 0 times to form thick and thin fibers in the fiber axis direction. The degree of dispersion of the thick portion in the formation of the thick and thin portions, and the length and length of the thick portion are adjusted by setting an appropriate combination of the first stretching and the second stretching in the two-stage stretching.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION An example of a preferred embodiment for producing the thick and thin fibers used in the present invention will be described below. The main repeating unit is ethylene terephthalate, the modified polyester obtained by copolymerizing 1.5-3.5 mol% of 5-sodium sulfoisophthalic acid is placed in the sheath part, and polyethylene terephthalate is placed in the core part, and air entanglement treatment is performed. Meanwhile, the unstretched composite fiber yarn obtained by spinning at a spinning speed of 1500 to 2500 m / min is stretched in two stages under the following conditions (1) to (4).

(1) TDR = MDR × (0.45-0.
60) = DR ₁ × DR ₂ (2) DR ₁ = MDR × (0.40-0.55) (3) HRT ≦ Tc (4) Tg ≦ HPT ≦ Tc where TDR is the total stretching ratio and MDR is the maximum Stretch ratio, D
R ₁ is the first stretching ratio, DR ₂ is the second stretching ratio, HRT is the first stretching temperature, HPT is the second stretching temperature, Tc is the crystallization temperature, and Tg is the glass transition temperature. is there.

Alternatively, the unstretched composite fiber yarn is hot-pin-stretched at a stretch ratio of 0.50 to 0.75 times the maximum stretch ratio of the fiber to form a thin or thick fiber in the axial direction. Another example of the preferred embodiment of the production of the thick and thin fibers used in the present invention will be described below. The main repeating unit is ethylene terephthalate, 5-sodium sulfoisophthalic acid 1.5
A modified polyester obtained by copolymerizing ˜3.5 mol% is placed in the sheath part, and polyethylene terephthalate is placed in the core part.
The unstretched composite fiber yarn obtained by spinning at 500 m / min is hot-pin-stretched under the condition of the following formula (6), (7) or (6) to (8).

(6) MDR × 0.50 ≦ DR ≦ MDR × 0.75 (7) P ₁ T ≦ T _c (8) T _g ≦ P ₂ T ≦ T _c However, in the formula, DR is the draw ratio, MDR Is the maximum draw ratio of the undrawn yarn, P ₁ T is the temperature (° C.) of the first friction resistance pin in the drawn region, T _c is the crystallization temperature (° C.) of the undrawn yarn, P ₂
T is the temperature (° C.) of the second friction resistance pin, and T _g is the glass transition temperature (° C.) of the undrawn yarn.

The shrinkage of the obtained polyester sheath core composite fiber yarn is heat-treated so as to give a desired shrinkage depending on the temperature of the first or second friction resistance pin. The degree of dispersion of the thick portion, the length of the thick portion, and the size of the thick portion in the formation of the thin portion are adjusted by setting an appropriate combination with the draw ratio and the temperature of the first friction resistance pin.

The thick and thin composite fiber yarn may be in any yarn form such as spun yarn, multifilament yarn or further false twisted yarn. In the present invention, the thick and thin composite fiber yarn can be alkali-reduced in the form of a yarn, but after weaving and knitting, it is ordinarily applied to polyester fiber woven fabrics and knitted fabrics in the form of woven fabrics and knitted fabrics. It is preferable to carry out the alkali weight reduction treatment by the weight reduction processing which is performed.

Prior to the alkali weight reduction treatment, a raising treatment can be applied, and not only the raising effect is imparted by raising treatment such as paper raising, thistle raising, needle cloth raising, etc., but also the sheath portion on the surface of the thick and thin composite fiber yarns. The damage is promoted to decompose and remove the thick portion and the sheath portion of the detail by the alkali in the alkali weight reduction treatment, so that the multicolor expression is further improved.

For the alkali weight reduction treatment, known methods and conditions using an alkali metal hydroxide such as sodium hydroxide are applied, and any method such as suspension weight loss, liquid flow weight loss, pad weight loss is used. In the present invention, at least the thick part of the thick composite fiber yarn is decomposed and removed by the alkali reduction treatment. In the decomposition and removal of the sheath component by the alkali reduction treatment, at least the sheath component of the thick part is decomposed and removed so that at least a part of the core part of the thick part is exposed. This alkali reduction treatment needs to be performed within a range where all of the sheath components are not decomposed and removed.

In the alkali weight reduction treatment, the sheath component in the thick portion can be selectively removed to expose the core portion, and at a weight loss rate of 15 to 50 wt%, the ratio of the portion having different dyeability on the fiber surface can be arbitrarily set. Can be changed to.

The thick and thin composite fiber yarn subjected to the alkali weight reduction treatment is colored with a cationic dye or an acid dye and / or a disperse dye according to the dyeing properties of the polyester of the sheath component and the core component, and the sheath portion and the exposed core are exposed. The parts, the thick parts, and the details are colored in different colors. In addition, it is possible to perform various colorings such as leaving the exposed core portion dyed in one-side dyeing such as leaving white, and in some cases, uniformly dyeing the whole.

As a coloring method, known methods and devices such as dyeing, printing or a combination of dyeing and printing, and discharge printing in printing, and dye-proofing are applied depending on the form of the fiber, and are not particularly limited. Absent.

[0040]

The present invention will be described below in more detail with reference to examples. [Example 1] Intrinsic viscosity 0.72, density 1.38 g / cm
³ , polyethylene terephthalate having a melting point of 256 ° C. was used as a core component, and 5-sodium sulfoisophthalic acid was added to 2.
Intrinsic viscosity 0.58, density 1.
A cationic dye-dyeable modified polyethylene terephthalate having a melting point of 252 ° C. of 38 g / cm ³ was used as a sheath component with a nozzle having 48 nozzle holes, a spinning temperature of 285 ° C., a composite ratio (area ratio) sheath part / core part = 1 / 2. Spin on a round cross section at a take-off speed of 1800 m / min, and air pressure of 4 kg / cm with an air entanglement nozzle between two take-up rollers.
² , entanglement processing under the condition of overfeed rate 1%,
An undrawn yarn having a denier of 230 (d) and a maximum draw ratio of 3.3 was obtained. This undrawn yarn has a draw ratio of 2.244, a first friction resistance pin temperature of 60 ° C. and a second friction resistance pin temperature of 110 ° C.
Stretched with a semi-dal, 100d / 48f, breaking strength 2.8g / d, breaking elongation 30%, boiling water shrinkage 25%, average deviation of thickness unevenness 1.5%, coefficient of variation CV 8.6%, A slab-like thick and thin core-sheath type composite fiber multifilament drawn yarn having an interlacing number of 7.1 / m was obtained. Further, this drawn yarn was woven under the following conditions and subjected to alkali weight reduction treatment and dyeing treatment. Weaving: Warp: Semi-dull 100d / 48f, 300T / M (S
Twisted), 70 threads / 3 threads / dimension Weft: Semidal 100d / 48f, 2000T / M (S
Twist, Z-twist, 2 twists), 120 stitches / inch Structure: Plain weave Treatment process Genki → Scouring (boiling water) → Relaxing (110 ℃)
→ Intermediate set (190 ℃) → Alkali weight loss →
Dyeing Alkaline weight loss: Weight loss method: Hanging weight loss NaOH: 15g / l Boiling water x 60 minutes (weight reduction rate 25%) Dye: Dye: Kayacryl blue 3RLED 1% owf (Cationic dye manufactured by Nippon Kayaku Co., Ltd.) (vs. fiber weight) ) Dye: Dynics Red NSE 1% owf (Disperse dye manufactured by Mitsubishi Kasei Hoechst Co., Ltd.) (weight of fiber) Bath ratio: 1:30, 130 ° C x 60 minutes The coloring result of the woven fabric obtained by the dyeing treatment is When dyed only with a dye, the details are dyed blue, the exposed core part of the thick part is left white, and the clear white part of the thick part that could not be obtained by the conventional thick marbled composite fiber yarn is left. A multicolored expression rich in design was obtained. When dyed with a dye or dye, the details are blue-violet and the thick exposed core is red.
The slab-like expression by the thick part was added to the effect of the different color mix, and it was highly commercialized and rich in design.
These dyed woven fabrics also had an excellent swelling feeling and a dry touch, which the thick and thin fibers have, and were rich in drape.

Example 2 Intrinsic viscosity 0.72, density 1.
Intrinsic viscosity 0.5 obtained by copolymerizing polyethylene terephthalate of 38 g / cm ³ and melting point 256 ° C. as a core component with 2.0 mol% of 5-sodium sulfoisophthalic acid
8, using a cationic dye dyeable modified polyethylene terephthalate having a density of 1.38 g / cm ³ and a melting point of 252 ° C. as a sheath component, with a nozzle having 48 nozzle holes, a spinning temperature of 285
℃, composite ratio (area ratio) sheath part / core part = 1/2, spun on a round cross section at a take-up speed of 1800 m / min, and air pressure of 4 by an air entanglement nozzle between two take-up rollers.
Entanglement treatment was performed under the conditions of kg / cm ² and an overfeed rate of 1%, 173 denier (d), maximum draw ratio = 3.
3 undrawn yarn was obtained. This unstretched yarn was drawn at a first draw ratio of 1.
643, second draw ratio 1.015, first draw temperature 110
At a second stretching temperature of 115 ° C., 104d / 48
f, breaking strength 1.8 g / d, breaking elongation 74%, boiling water shrinkage 21%, average deviation of thickness unevenness 1.14%, coefficient of variation C
A slab-like thick core-sheath type composite fiber multifilament drawn yarn having V11% and the number of entanglements of 6.3 / m was obtained. Further, this drawn yarn was woven under the same conditions as in Example 1, subjected to a 20% alkali reduction treatment, and then dyed with a red cationic dye. In the obtained woven fabric, the thick part of the fiber was left white, and only the details were dyed in red, and a multicolor expression rich in design was obtained. Further, after that, when dyed with a blue disperse dye, the thick part was blue, and the details were multicolored with magenta.

[Comparative Example 1] Intrinsic viscosity 0.72, density 1.
Intrinsic viscosity 0.5 obtained by copolymerizing polyethylene terephthalate of 38 g / cm ³ and melting point 256 ° C. as a core component with 2.0 mol% of 5-sodium sulfoisophthalic acid
8, using a cationic dye dyeable modified polyethylene terephthalate having a density of 1.38 g / cm ³ and a melting point of 252 ° C. as a sheath component, with a nozzle having 48 nozzle holes, a spinning temperature of 285
℃, composite ratio (area ratio) sheath part / core part = 1/2, spinning at a drawing speed of 1800 m / min in a round cross section, 173 denier (d), maximum draw ratio = 3.5 of undrawn yarn was obtained. .
This undrawn yarn was drawn at a draw ratio of 1.736, a first friction resistance pin temperature of 58 ° C. and a second friction resistance pin temperature of 106 ° C. to give a semi-dal, 100 d / 48 f, breaking strength of 2.8 g /
d, break elongation 30%, boiling water shrinkage 25%, average deviation ratio of thickness unevenness 1.3%, coefficient of variation CV 6.7%, ordinary core-sheath type composite fiber multifilament having about 0 entanglement / m A drawn yarn was obtained. Further, this drawn yarn was woven under the same conditions as in Example 1 and subjected to alkali reduction treatment and dyeing treatment.
The coloring result of the woven fabric obtained by the dyeing treatment is that when dyed only with a dye, the whole is colored blue, and when dyed with a dye and a dye, it is colored violet as a whole,
No distinctive or shade effect was observed.

[Comparative Example 2] Intrinsic viscosity 0.72, density 1.
Intrinsic viscosity 0.5 obtained by copolymerizing polyethylene terephthalate of 38 g / cm ³ and melting point 256 ° C. as a core component with 2.0 mol% of 5-sodium sulfoisophthalic acid
8, using a cationic dye dyeable modified polyethylene terephthalate having a density of 1.38 g / cm ³ and a melting point of 252 ° C. as a sheath component, with a nozzle having 48 nozzle holes, a spinning temperature of 285
℃, composite ratio (area ratio) sheath part / core part = 1/2, spinning at a drawing speed of 1800 m / min in a round cross section, 173 denier (d), maximum draw ratio = 3.5 of undrawn yarn was obtained. .
This undrawn yarn has a first draw ratio of 1.671, a second draw ratio of 1.01, a first draw temperature of 110 ° C. and a second draw temperature of 120.
Stretched at ℃, 103d / 48f, breaking strength 1.8g /
d, breaking elongation 74%, boiling water shrinkage 21%, average deviation of thickness irregularity 1.14%, coefficient of variation CV 3.8%, slab-like thick thin-core sheath-type composite fiber with 0 entanglement / m. A multifilament drawn yarn was obtained. The drawn yarn obtained was treated in the same manner as in Example 1,
It was woven and subjected to alkali weight loss treatment and dyeing treatment. The coloring result of the woven fabric obtained by the dyeing treatment is that when dyed only with the dye, the whole is colored blue, and when dyed with the dye and the dye, it is colored violet as a whole, and the different color / shading effect is recognized. I couldn't do it.

[Comparative Example 3] Intrinsic viscosity 0.72, density 1.
Intrinsic viscosity 0.5 obtained by copolymerizing polyethylene terephthalate of 38 g / cm ³ and melting point 256 ° C. as a core component with 2.0 mol% of 5-sodium sulfoisophthalic acid
8, using a cationic dye dyeable modified polyethylene terephthalate having a density of 1.38 g / cm ³ and a melting point of 252 ° C. as a sheath component, with a nozzle having 48 nozzle holes, a spinning temperature of 285
℃, composite ratio (area ratio) sheath part / core part = 1/2, spinning was performed at a take-up speed of 1800 m / min in a circular cross section to obtain an undrawn yarn of 230 denier (d) and maximum draw ratio = 3.5. .
The undrawn yarn was drawn at a draw ratio of 2.244, a first frictional resistance pin temperature of 60 ° C. and a second frictional resistance pin temperature of 110 ° C. to give a semi-dal, 100 d / 48 f, breaking strength of 2.8 g /
d, break elongation 30%, boiling water shrinkage 25%, average deviation of thickness unevenness 1.0%, coefficient of variation CV 4.0%, ordinary core-sheath type composite fiber multifilament having about 0 entanglement / m A drawn yarn was obtained. Further, this drawn yarn was woven under the same conditions as in Example 1 and subjected to alkali reduction treatment and dyeing treatment.
The coloring result of the woven fabric obtained by the dyeing treatment is that when dyed only with a dye, the whole is colored blue, and when dyed with a dye and a dye, it is colored violet as a whole,
No distinctive or shade effect was observed.

[Comparative Example 4] Intrinsic viscosity 0.72, density 1.
Intrinsic viscosity 0.5 obtained by copolymerizing polyethylene terephthalate of 38 g / cm ³ and melting point 256 ° C. as a core component with 2.0 mol% of 5-sodium sulfoisophthalic acid
8, using a cationic dye dyeable modified polyethylene terephthalate having a density of 1.38 g / cm ³ and a melting point of 252 ° C. as a sheath component, with a nozzle having 48 nozzle holes, a spinning temperature of 285
℃, composite ratio (area ratio) sheath part / core part = 1/2, spinning at a take-up speed of 1800 m / min on a round cross section, and air pressure of 2 with an air entanglement nozzle between two take-up rollers.
Entanglement treatment was performed under the conditions of kg / cm ² and an overfeed rate of 1%, 230 denier (d), maximum draw ratio = 3.
3 undrawn yarn was obtained. This undrawn yarn has a draw ratio of 2.24.
4, the first friction resistance pin temperature 60 ℃, the second friction resistance pin temperature 110 ℃ stretched, semi-dal, 100d / 48f,
Breaking strength 2.8 g / d, breaking elongation 30%, boiling water shrinkage 2
5%, average deviation rate of thickness unevenness 1.3%, coefficient of variation CV6.
A slab-like thick and thin core-sheath type composite fiber multifilament stretched yarn having 0% and 2 entanglements / m was obtained. Further, this drawn yarn was woven under the same conditions as in Example 1 and subjected to alkali reduction treatment and dyeing treatment. The dyeing result of the woven fabric obtained by the dyeing treatment shows a multicolored expression of the stone wash tone of jeans when dyed only with the dye, and when it is dyed with the dye and the dye, there is a depth that looks purple as a whole. Although it showed a melange-like multicolor expression, it remained white and the clarity of each color was not sufficient.

[0046]

EFFECT OF THE INVENTION The polyester core-sheath type composite fiber yarn according to the present invention is a slab-like thick and thin fiber, and therefore, it is possible to express a more distinct multicolor, and more The effect of is also synergized, and it is possible to obtain a textile product having a good texture and rich in design. Further, the polyester core-sheath type composite fiber yarn according to the present invention has high productivity even in a small lot and can provide a fiber product of multicolor expression,
It is an economically advantageous material.

[0047]

[Brief description of the drawings]

FIG. 1 is a chart obtained by an Eevenes tester showing the thickness unevenness of the drawn yarn obtained in Example 1.

FIG. 2 is a chart obtained by an Eevenes tester showing the thickness unevenness of the drawn yarn obtained in Example 2.

FIG. 3 is a chart obtained by an Eevenes tester showing uneven thickness of the drawn yarn obtained in Comparative Example 1.

FIG. 4 is a chart obtained by an Eevenes tester showing the thickness unevenness of the drawn yarn obtained in Comparative Example 2.

Claims (10)

[Claims] 1. One of two kinds of polyesters having different dyeing properties is arranged in a sheath portion and the other is arranged in a core portion, and is composed of a composite fiber having a thickness along the fiber axis direction, and the number of entanglement is 3 A polyester sheath core composite fiber yarn having entangled portions of up to 150 / m. 2. The polyester sheath core composite fiber yarn according to claim 1, wherein the area ratio of the sheath part / core part in the cross section of the composite fiber is 1/3 to 1/1. 3. The entangled portion constitutes a thick portion and the non-entangled portion constitutes a detail, and the variation coefficient CV of the thickness unevenness of the entire yarn is 7 to 15%.
The polyester sheath core composite fiber yarn according to claim 1 or 2. 4. The polyester sheath core composite fiber yarn according to claim 1, wherein at least a part of the thick core portion is exposed. 5. A composite fiber yarn obtained by air-entanglement of an unstretched composite fiber yarn having one of two polyesters having different dyeability as a sheath component and the other as a core component, or A semi-stretching treatment is performed using an unstretched conjugate fiber yarn obtained by spinning a conjugate fiber having one of two polyesters with different dyeability as a sheath component and the other as a core component while air-entanglement treatment. A method for producing a polyester sheath core composite fiber yarn, which is characterized in that a thickness is formed in the fiber axis direction by carrying out. 6. The method for producing a polyester sheath core composite fiber yarn according to claim 5, wherein the semi-drawing treatment is carried out in two stages under conditions satisfying the following formulas (1) to (5). (1) TDR = MDR × (0.45 to 0.55) (2) TDR = DR ₁ × DR ₂ (3) DR ₁ = MDR × (0.40 to 0.50) (4) HRT ≦ Tc ( 5) Tg ≦ HPT ≦ Tc where TDR is the total draw ratio, DR ₁ is the first draw ratio, DR ₂ is the second draw ratio, MDR is the maximum draw ratio of the undrawn yarn, and HRT is the first draw ratio. The temperature in the first stage stretching (° C), HPT is the temperature in the second stage stretching region (° C), T
c is the crystallization temperature (° C) of the undrawn yarn, and Tg is the glass transition temperature (° C) of the undrawn yarn. 7. The method for producing a polyester sheath core composite fiber yarn according to claim 5, wherein the semi-drawing treatment is carried out by hot pin drawing under conditions satisfying the following formulas (6) and (7). (6) MDR × 0.50 ≦ DR ≦ MDR × 0.75 (7) P ₁ T ≦ T _c where DR is the draw ratio, MDR is the maximum draw ratio of the undrawn yarn, and P ₁ T is the draw region. The temperature (° C.) of the first friction resistance pin and T _c are the crystallization temperature (° C.) of the undrawn yarn. 8. The method for producing a polyester sheath core composite fiber yarn according to claim 7, wherein hot pin drawing is performed under conditions satisfying the following expression (8). (8) T _g ≦ P ₂ T ≦ T _c where P ₂ T is the temperature (° C.) of the second friction resistance pin and T _g is the glass transition temperature (° C.) of the undrawn yarn. 9. The method for producing a polyester sheath core composite fiber yarn according to claim 5, 6, 7 or 8, wherein the fiber is entangled at an air pressure of 3 to 6 kg / cm ² and is spun at 1000 to 2500 m / min. . 10. The polyester sheath core conjugate fiber yarn according to claim 5, 6, 7, 8 or 9, wherein after semi-drawing treatment, alkali weight reduction treatment is carried out to decompose and remove at least a thick sheath component of the conjugate fiber. Manufacturing method.