JP2920362B2 - Polyester sea core composite fiber yarn and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber 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. As such a thick fiber, a sea-score conjugate fiber having a thick and thin shape obtained by spinning a sea-score composite fiber with two components having different dyeing properties and stretching the fiber under conditions to give a thin and fine property, wherein a component having a hetero-staining property is sheathed. The components arranged in the parts are disclosed in JP-A-55-116812 and JP-A-55-116819.

However, the dyeing properties of the conventionally known thick and thin conjugate fibers mainly depend on the dyeing properties of the polymer of the thick part and the thin sheath part, and are sufficiently expressed so as to satisfy the dyeing properties of the core part. In addition, the effect of marbling by dyeing light and shade was not sufficient, and the variety was lacking.

[0005]

SUMMARY OF THE INVENTION The present invention is based on a study of a thick and thin sea-score composite fiber yarn, and as a result, has found a wide variety of multicolor expression effects which have never been known before. SUMMARY OF THE INVENTION It is an object of the present invention to provide a polyester fiber core composite fiber yarn exhibiting a multicolor expression effect of different hues and different densities.

[0006]

According to the present invention, there is provided a conjugate fiber having two types of polyesters having different dyeing properties, one of which is disposed in a sheath portion and the other of which is disposed in a core portion, and which is thick and thin along a fiber axis direction. made, and has an entangled portion of the exchange絡数3-150 pieces / m, this the interlaced parts thick part, non-entangled portions constitute a detailed
Polyester sheath-core composite fiber yarn that features the door,
And, using a composite fiber yarn obtained by subjecting an undrawn composite fiber yarn having one of the two polyesters having different dyeing properties to a sheath component and the other to a core component by air entanglement treatment, or A semi-drawing process is performed using an undrawn composite fiber yarn obtained by spinning a conjugate fiber having one of two kinds of polyesters having different properties as a sheath component and the other as a core component while performing air entanglement. Accordingly, a gist of the present invention is a method for producing a polyester fiber core composite fiber yarn characterized by forming a thick line in the fiber axis direction.

[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, a modified polyester may be disposed on the sheath portion and another type of modified polyester may be disposed on the core portion. However, it is preferable to use a modified polyester which is dyeable with a cationic dye or an acid dye or easily dyeable with a disperse dye. Next, an unmodified polyester is disposed in the core.

[0008] The modified polyester is a polyester which has been modified to be dyeable or easily dyeable by using ethylene terephthalate as a main repeating unit, and the unmodified polyester is a polyester having 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. A modified polyester, preferably a modified polyester obtained by copolymerizing 1.5 to 3.5 mol% of 5-sodium sulfoisophthalic acid with ethylene terephthalate is used.

As the modified polyester capable of dyeing an acid dye, ethylene terephthalate obtained by a known method may be used in combination with an amino alcohol such as N-alkyl-substituted diethanolamine or a base-containing ester-forming compound such as tertiary amino-containing glycol. Polymerized modified polyester, modified polyethylene terephthalate mixed with homopolymer or copolymer of vinylpyridine 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. Such an unmodified polyester may contain less than 5 mol% of a copolymer component or a blend component, but is more preferably polyethylene terephthalate. Is used.

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

The fact that the entangled portion forms a thick portion and the non-entangled portion forms a thick and thin portion that constitutes a detail, and that the variation coefficient CV of the thickness unevenness of the whole yarn is 7 to 15% allows the alkali to be formed. The exposed portion of the core of all the constituent filaments is limited due to the weight loss, and a clearer multi-color expression is possible.

When the coefficient of variation CV is less than 7%, the entanglement of each fiber is insufficient, the thick portion is dispersed, the exposure of the core portion becomes inconspicuous, and the dyeing after alkali reduction treatment is caused by multicolor dyeing or dyeing shading. 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 occur, and the quality tends to be poor.

Here, the coefficient of variation CV of the thickness unevenness is measured by an EVENESTESTER (KET-80) manufactured by Keisoku Kogyo Co., Ltd.
Using 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 is an index indicating the magnitude of deviation from the average value.

On the other hand, if the number of entangled portions exceeds 150 / m, the dyeability of the details tends to be unclear, and if it is less than 3 / m, the coloring of the thick portions becomes unclear, and each of them has a sufficient amount. It is difficult to obtain a color effect.

Here, the number of confounding parts is ROTHSCH
Automatic yarn entanglement tester (Needle Pul) manufactured by ILD MESSINSTRUMMENTE
1Tester R-2040) using trip level tension shown in the following equation.

[Trip level tension = (D × 0.
2) + D / F + vibration width] (where D represents the denier of the yarn bundle, F represents the number of filaments constituting the yarn bundle, and the vibration width represents D × 0.02). The combined ratio of the sheath portion and the core portion occupying the cross section is preferably 1/3 to 1/1 in terms of the sheath / core area ratio. 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 sheath core conjugate fiber of the present invention may have any cross-sectional shape such as a round cross-section, a triangular shape, a multi-lobed shape, and a flat cross-sectional shape. The shape, number and position of the core portion are not particularly limited. Not done.

The sea-score conjugate fiber of the present invention has so-called thick and thin having a fineness changed in the fiber axis direction, and at least the entire core portion of the thick-and-thin sea-score conjugate fiber. Or a part is exposed. It is preferable from the viewpoint of multicolor expression that a part of the thick core is exposed rather than the entire core, but the degree of exposure of the thick core is appropriately selected according to the purpose. Although the exposure of the core portion other than the thick portion may be performed as needed, it is preferable that the exposure be limited to a portion of the core portion other than the thick portion.

In the sheath core conjugate 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, respectively, and the coloring constitutes the sheath portion and the core portion, respectively. Dyeing properties of polyester, based on the darkness of the thick part, cationic dye and disperse dye, acid dye and disperse dye, or any hue such as disperse dye and disperse dye,
It is expressed in multiple colors by a combination of 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 seascore conjugate fiber yarn of the present invention is preferably produced as follows. The polyester used in the production method of the present invention is a combination of modified and unmodified polyesters having different dyeing properties,
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 small degree of modification in the core, or modified polyester in the sheath, other types of modification Composite spinning of a polyester in the core, preferably a cationic polyester dyeable or acid dyeable or disperse dye easily dyeable modified polyester in the sheath, and an unmodified polyester in the core, forming a sea core type. I do.

The sheath core type composite structure obtained by subjecting the sheath portion and the core portion to composite spinning at a composite ratio such that the sheath / core area ratio is preferably 1/3 to 1/1 is obtained. After the yarn is entangled with air, it is subjected to a half-drawing process to obtain a thick fiber.

In order to form a good thick and thin difference as the undrawn composite fiber yarn to be used, the spinning speed should be 1000-2.
It is preferable that the yarn is an undrawn yarn obtained under the condition of 500 m / min. In 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 perform the confounding process.

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

On the other hand, if the air pressure is less than 3 kg / cm ² , the entanglement between the filaments constituting the yarn bundle is insufficient, and the position of the thick portion of each filament is dispersed. Expression cannot be obtained, 6 kg / cm ²
If it exceeds, not only the entangled form becomes defective, but also the filament is greatly damaged, which causes a thread breakage or the like.

In order to obtain thick fibers, the undrawn composite fiber yarn obtained as described above is subjected to a half-drawing treatment. For example, the unstretched composite fiber yarn, the draw ratio of about half of the maximum draw ratio of the fiber, preferably 0.45 to 0.6 of the maximum draw ratio
By drawing at a magnification of 0, semi-stretching, preferably stretching in two stages, and stretching in two stages, a thick line is formed 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 The following is an example of a preferred embodiment of the production of a fine fiber used in the present invention. A main repeating unit is ethylene terephthalate, a modified polyester obtained by copolymerizing 1.5 to 3.5 mol% of 5-sodium sulfoisophthalic acid is provided in a sheath portion, polyethylene terephthalate is provided in a core portion, and air entangled. The undrawn composite fiber yarn obtained by spinning at a spinning speed of 1500 to 2500 m / min is stretched in two steps 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 undrawn composite fiber yarn is drawn with a hot pin at a magnification of 0.50 to 0.75 times the maximum drawing ratio of the fiber, thereby forming a thin line in the fiber axis direction. Another example of the preferred embodiment of the production of the fine fiber used in the present invention will be described below. The main repeating unit is ethylene terephthalate, and 5-sodium sulfoisophthalic acid 1.5
~ 3.5 mol% of the modified polyester is disposed in the sheath portion, and polyethylene terephthalate is disposed in the core portion.
The undrawn composite fiber yarn obtained by spinning at 500 m / min is subjected to hot pin drawing under the conditions satisfying 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 where DR is a draw ratio, MDR Is the maximum draw ratio of the undrawn yarn, P ₁ T is the temperature of the first frictional resistance pin in the drawn region (° C.), T _c is the crystallization temperature of the undrawn yarn (° C.), P ₂
T is the temperature (° C.) of the second frictional 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 to give a desired shrinkage depending on the temperature of the first or second frictional resistance pin. The degree of dispersion of the thick portion in the formation of the thick and thin portions, and the length and magnitude of the thick portion are adjusted by setting an appropriate combination of the stretching ratio and the temperature of the first frictional resistance pin.

The thick and thin composite fiber yarn may be in any yarn form such as a spun yarn, a multifilament yarn or a false twisted yarn. In the present invention, thick and thin composite fiber yarns can be subjected to alkali weight reduction treatment in the form of yarns, but after weaving and knitting, they are usually applied to woven fabrics and knitted fabrics of polyester fiber woven fabrics and knitted fabrics. It is preferable to carry out an alkali weight loss treatment by the weight loss processing that has been performed.

Prior to the alkali weight reduction treatment, a brushing treatment can be performed, and not only a brushing treatment such as paper brushing, bruise brushing, needle cloth brushing but also a brushing effect is imparted, and a sheath portion on the surface of the thick and thin composite fiber yarn. The decomposition of the thick portion or the detailed sheath portion by the alkali in the alkali weight reduction treatment by alkali is promoted by the damage imparting, 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 hanging weight reduction, liquid flow weight reduction, and pad weight reduction may be used. In the present invention, the sheath component of at least the thick portion of the thick and thin 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 of the thick part is selectively removed, the core part can be exposed, and the ratio of the parts having different dyeing properties on the fiber surface at a weight reduction rate of 15 to 50 wt% can be arbitrarily determined. Can be changed to

The thick composite fiber yarn which has been subjected to the alkali weight reduction treatment is subjected to a coloring treatment with a cationic dye or an acid dye and / or a disperse dye in accordance with the dyeability of the polyester of the sheath component and the core component to form a sheath portion and an exposed core. The part and the thick part and the detail are colored in different colors. In addition, various colors are possible, such as one-sided dyeing of the exposed core portion, such as leaving a white portion, or, in some cases, uniform dyeing of the whole.

As a coloring method, known methods and devices such as dyeing, printing or a combination of dyeing and printing, and further, discharging and anti-dyeing in printing are applied according to the form of the fiber. 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. is used as a core component, and 5-sodium sulfoisophthalic acid is used.
0 mol% copolymerized, intrinsic viscosity 0.58, density 1.
Using a cationic dye-dyeable modified polyethylene terephthalate having a melting point of 252 ° C. and a sheath component of 38 g / cm ³ , a spinning temperature of 285 ° C., a composite ratio (area ratio) sheath / core = 1 / 2. Spin on a round cross section at a take-up speed of 1800 m / min and air pressure of 4 kg / cm between two take-up rollers using an air entanglement nozzle.
^2. Perform confounding under the condition of over feed rate 1%,
An undrawn yarn having 230 denier (d) and a maximum draw ratio of 3.3 was obtained. This undrawn yarn is 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.
And stretched in a semi-dal, 100d / 48f, breaking strength 2.8g / d, breaking elongation 30%, boiling water shrinkage 25%, average deviation rate of thickness unevenness 1.5%, variation coefficient CV 8.6%, A slab-like thick and thin sheath-core composite fiber multifilament drawn yarn having an entangling number of 7.1 / m was obtained. Further, the drawn yarn was woven under the following conditions, and subjected to an alkali weight reduction treatment and a dyeing treatment. Weaving: Warp: Semidall 100d / 48f, 300T / M (S
Twist), 70 birds / 3 pcs / size Weft: semi-dull 100d / 48f, 2000T / M (S
Twisted, Z-twisted, alternate 2), 120 / dimensions Texture: Plain weave Processing process Raw fabric → scouring (boiling water) → relax (110 ° C)
→ Intermediate set (190 ℃) → Alkali weight loss →
Dyeing Alkali weight loss: Weight loss method: Hanging weight loss NaOH: 15 g / l Boiling water x 60 minutes (weight loss rate 25%) Dye: Dye: Kayacryl Blue 3RLED 1% owf (Nippon Kayaku Co., Ltd. cationic dye) (weight to fiber) Dye: Dyanix Red NSE 1% owf (dispersed dye manufactured by Mitsubishi Kasei Hoechst Co., Ltd.) (weight to fiber) Bath ratio: 1:30, 130 ° C. × 60 minutes The coloring result of the woven fabric obtained by the dyeing treatment is as follows. When dyed only with a dye, the details are dyed blue and the exposed core part of the thick part is left white, and a clear white part of the thick part that was not obtained with the conventional marbled thick thin composite fiber yarn. A multi-colored expression rich in design was obtained. In addition, when dyeing using a dye and a dye, the details are blue purple, the thick exposed core is red,
The product was highly productive and rich in design, with the slab-like expression of the thick part added to the effect of the different color mix.
These dyed woven fabrics also had excellent feeling of swelling and dry touch of the fine and fine fibers, and were rich in drape.

Example 2 Intrinsic viscosity 0.72, density 1.
Intrinsic viscosity 0.5 obtained by copolymerizing 2.0 mol% of 5-sodium sulfoisophthalic acid using polyethylene terephthalate of 38 g / cm ³ and a melting point of 256 ° C. as a core component.
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, and using a nozzle having 48 nozzle holes and a spinning temperature of 285.
° C, composite ratio (area ratio) sheath part / core part: 1/2, spinning at a take-up speed of 1800 m / min in a round section, and air pressure 4 between two take-up rollers by an air entanglement nozzle
The confounding treatment was performed under the conditions of kg / cm ² and an overfeed rate of 1%, and 173 denier (d), maximum stretching ratio = 3.
No. 3 undrawn yarn was obtained. This undrawn yarn is subjected to a first draw ratio of 1.
643, second stretching ratio 1.015, first stretching temperature 110
At a second stretching temperature of 115 ° C., and 104 d / 48
f, breaking strength 1.8 g / d, breaking elongation 74%, boiling water shrinkage 21%, average deviation rate of thickness unevenness 1.14%, variation coefficient C
V11%, a slab-like thick and thin sheath-core composite fiber multifilament drawn yarn having a confounding number of 6.3 / m was obtained. Further, the 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 red, and a multicolor expression rich in design was obtained. After that, when dyed with a blue disperse dye, the thick part was blue and the details were reddish purple.

Comparative Example 1 An intrinsic viscosity of 0.72 and a density of 1.
Intrinsic viscosity 0.5 obtained by copolymerizing 2.0 mol% of 5-sodium sulfoisophthalic acid using polyethylene terephthalate of 38 g / cm ³ and a melting point of 256 ° C. as a core component.
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, and using a nozzle having 48 nozzle holes and a spinning temperature of 285.
C, the composite ratio (area ratio) sheath portion / core portion was 1/2, and a round section was spun at a take-up speed of 1800 m / min to obtain an undrawn yarn having 173 denier (d) and a maximum draw ratio of 3.5. .
This undrawn yarn is drawn at a draw ratio of 1.736, a first frictional resistance pin temperature of 58 ° C., and a second frictional resistance pin temperature of 106 ° C., and is semi-dull, 100d / 48f, and breaking strength of 2.8 g /.
d, ordinary core-sheath type composite fiber multifilament having a breaking elongation of 30%, a boiling water shrinkage of 25%, an average deviation rate of thickness unevenness of 1.3%, a variation coefficient of CV of 6.7%, and a confound number of about 0 / m. A drawn yarn was obtained. Further, the 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, when colored only with a dye, the whole is colored blue, and when dyed with a dye and a dye, the whole is colored blue-violet,
No unique color / shading effect was observed.

Comparative Example 2 An intrinsic viscosity of 0.72 and a density of 1.
Intrinsic viscosity 0.5 obtained by copolymerizing 2.0 mol% of 5-sodium sulfoisophthalic acid using polyethylene terephthalate of 38 g / cm ³ and a melting point of 256 ° C. as a core component.
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, and using a nozzle having 48 nozzle holes and a spinning temperature of 285.
C, the composite ratio (area ratio) sheath portion / core portion was 1/2, and a round section was spun at a take-up speed of 1800 m / min to obtain an undrawn yarn having 173 denier (d) and a maximum draw ratio of 3.5. .
This undrawn yarn was subjected to 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.
C. and stretched at 103d / 48f, breaking strength 1.8g /
d, slab-like thick and thin sheath-core composite fiber having a breaking elongation of 74%, a boiling water shrinkage of 21%, an average deviation rate of thickness unevenness of 1.14%, a coefficient of variation of CV 3.8%, and a confound number of 0 / m. A multifilament drawn yarn was obtained. The obtained drawn yarn was treated in the same manner as in Example 1,
The fabric was woven and subjected to an alkali weight reduction treatment and a dyeing treatment. The coloring result of the woven fabric obtained by the dyeing treatment is as follows: when dyed only with dye, the whole is colored blue, and when dyed with dye and dye, the whole is colored blue-purple, and a different color / shade effect is recognized. I couldn't.

Comparative Example 3 An intrinsic viscosity of 0.72 and a density of 1.
Intrinsic viscosity 0.5 obtained by copolymerizing 2.0 mol% of 5-sodium sulfoisophthalic acid using polyethylene terephthalate of 38 g / cm ³ and a melting point of 256 ° C. as a core component.
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, and using a nozzle having 48 nozzle holes and a spinning temperature of 285.
C., composite ratio (area ratio) sheath part / core part = 1/2, spinning a round section at a take-up speed of 1800 m / min to obtain an undrawn yarn having 230 denier (d) and a maximum draw ratio of 3.5. .
This undrawn yarn is drawn at a drawing ratio of 2.244, a first frictional resistance pin temperature of 60 ° C., and a second frictional resistance pin temperature of 110 ° C., and is semi-dull, 100d / 48f, and breaking strength of 2.8 g /.
d, normal core-sheath type composite fiber multifilament having a breaking elongation of 30%, a boiling water shrinkage of 25%, an average deviation rate of thickness unevenness of 1.0%, a variation coefficient of CV of 4.0%, and a confound number of about 0 / m. A drawn yarn was obtained. Further, the 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, when colored only with a dye, the whole is colored blue, and when dyed with a dye and a dye, the whole is colored blue-violet,
No unique color / shading effect was observed.

Comparative Example 4 An intrinsic viscosity of 0.72 and a density of 1.
Intrinsic viscosity 0.5 obtained by copolymerizing 2.0 mol% of 5-sodium sulfoisophthalic acid using polyethylene terephthalate of 38 g / cm ³ and a melting point of 256 ° C. as a core component.
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, and using a nozzle having 48 nozzle holes and a spinning temperature of 285.
° C, composite ratio (area ratio) sheath part / core part = 1/2, spinning at a take-up speed of 1800 m / min in a round section, and air pressure 2 between two take-up rollers by air entanglement nozzle
The confounding treatment was carried out under the conditions of kg / cm ² and an overfeed rate of 1%, 230 denier (d), maximum stretching ratio = 3.
No. 3 undrawn yarn was obtained. The undrawn yarn is drawn at a draw ratio of 2.24.
4. Stretching at a first frictional resistance pin temperature of 60 ° C. and a second frictional resistance pin temperature of 110 ° C., 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.
0%, a slab-like thick and thin sheath-core composite fiber multifilament drawn yarn having a number of entanglements of 2 / m was obtained. Further, the 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 shows a multicolored expression of a stone wash tone of jeans when colored only with a dye, and has a depth that looks purple as a whole when dyed with a dye and a dye. It exhibited a melange-like multicolor expression, but left white, and the clarity of each color was not sufficient.

[0046]

Since the polyester core-sheath type composite fiber yarn according to the present invention is a slab-like thin fiber, it is possible to express very clearly multicolor as compared with the conventional product, and furthermore, it is possible to obtain a thin and fine fiber. Is also synergistically obtained, and a fiber product with a good design and rich in design can be obtained. 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 multicolored fiber product.
It is an economically advantageous material.

[0047]

[Brief description of the drawings]

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

FIG. 2 is a chart obtained with an EVENESTESTER showing unevenness in the thickness of the drawn yarn obtained in Example 2.

FIG. 3 is a chart obtained with an EVENESTESTER showing unevenness in the thickness of the drawn yarn obtained in Comparative Example 1.

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

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-55-116819 (JP, A) JP-A-7-126920 (JP, A) JP-A-55-116812 (JP, A) (58) Investigation Field (Int.Cl. ⁶ , DB name) D01F 8/14

Claims (10)

(57) [Claims] 1. One of two types of polyesters having different dyeing properties is provided in a sheath portion and the other is provided in a core portion, and is made of a conjugated fiber having a thickness along the fiber axis direction. ~ 150 pcs / m entangled part, thick entangled part, non-entangled
Polyester sea-score composite fiber yarn characterized in that the entangled portion constitutes details . 2. The polyester sheath core conjugate fiber yarn according to claim 1, wherein the area ratio of the sheath part / core part in the cross section of the conjugate fiber is 1/3 to 1/1. 3. The variation coefficient CV of the thickness unevenness of the whole yarn is
The polyester according to claim 1 or 2 which is 7 to 15%.
Sea core composite fiber yarn. 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 subjecting an undrawn composite fiber yarn having one of two polyesters having different dyeing properties to a sheath component and the other to a core component by air entanglement, or A half-drawing treatment is performed using an undrawn composite fiber yarn obtained by spinning a conjugate fiber having one of two types of polyesters having different dyeing properties as a sheath component and the other as a core component while air-entangled. A method for producing a polyester fiber core composite fiber yarn, characterized in that the fiber is formed to be thick and thin in the fiber axis direction. 6. The method according to claim 5, wherein the semi-drawing treatment is carried out in two steps 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 (° C.) in the first-stage stretching, the HPT is the temperature (° C.) in the second-stage stretching zone, 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 the 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 area. Is the temperature (° C.) of the first frictional resistance pin, and T _c is 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 the hot pin drawing is performed under a condition satisfying the following expression (8). (8) T _g ≦ P ₂ T ≦ T _c where P ₂ T is the temperature (° C.) of the second frictional 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 yarn is wound at 1000 to 2500 m / min while being air-entangled at an air pressure of 3 to 6 kg / cm ^2. . 10. The polyester sheath-core composite fiber yarn according to claim 5, wherein the half-drawing treatment is followed by an alkali weight reduction treatment to decompose and remove at least a thick portion of the sheath component of the composite fiber. Manufacturing method.