JP3202931B2 - Latent bulky ultrafine blended yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a potentially bulky ultrafine polyester mixed fiber yarn having no discoloration due to abrasion. More specifically, a latent bulky ultrafine polyester fabric having a soft touch and repulsion of random ultrafine fibers on the fiber surface as a sheath yarn after shrinkage treatment, and having no discoloration due to exposure of a core yarn caused by abrasion of the sheath yarn. The present invention relates to a potentially bulky extra-fine mixed fiber yarn.

[0002]

2. Description of the Related Art There have been many proposals for improving polyester fibers, especially for improving the hand in clothing applications. As typified by silk-like, the properties that surpass some natural fibers have been made by the proposal of the modified cross-section technology, the different shrinkage mixed fiber technology, the different fineness mixed fiber technology, and the like. More recently, higher demands for fibers have become more pronounced. To cope with these demands, Japanese Patent Application Laid-Open No. 3-124807 proposes a method for reducing the weight of polyester fiber and imparting a dry texture. This proposal is a fiber having a hollow portion and a cross section having sharp vertices having a polygonal shape. Due to such a shape, it has become possible to reduce the weight of the polyester fiber, improve the firmness and stiffness, and further improve the dry texture. However,
The fibers had drawbacks such as insufficient surface softness and a large amount of polymer to be eluted and removed.

[0003] On the other hand, when producing a fluid-treated bulky yarn using two different types of polyester filament yarns, a fiber-forming polymer is contained in the filament yarn (sheath yarn) constituting the sheath portion. It is divided into seven or more segments by a polymer having high solubility, one of the segments is a core segment occupying almost the center of the filament cross-section, and the other segment has a fineness of 0.4 surrounding the core segment. 6 below 5d
A conjugate fiber which is a petal-like segment or more is used, and a high boiling water shrinkage yarn having a shrinkage ratio of 10% or more higher than the boiling water shrinkage ratio of the sheath yarn is used as a filament yarn (core yarn) constituting a core portion. Knitting by using a composite yarn obtained by treating in a fluid turbulent flow region while supplying the feed ratio of the sheath yarn to the overfeed of 10 to 20% with respect to the knitting, and then performing the alkali weight reduction treatment. A method for producing a bulky fabric having a conditioned texture is described in JP-A-4-24282.

[0004] Although this fabric can provide bulkiness, swelling feeling, soft touch, and other performances due to floating of the fine fibers on the surface of the yarn, it is not durable because the fine fibers are fibrillated or easily fall off due to friction. However, there is a problem that the coloring property is low.

[0005]

The disadvantage of the bulky ultrafine polyester composite yarn using the ultrafine yarn of the sheath yarn and the high shrinkage yarn of the core yarn, which could not be achieved by the prior art, is that the sheath yarn fluff comes off due to wear during wearing. The use of hollow fibers as discoloration and core yarns eliminates tension and stiffness, and the deficiency of light weight.The present invention is based on the fact that the bulky ultrafine polyester composite yarn was not sufficiently satisfactory in the prior art at the same time, the surface softness, It is an object of the present invention to sufficiently eliminate discoloration due to sheath yarn falling off due to abrasion, and to sufficiently satisfy tension, stiffness, and weight reduction by using a hollow fiber as a core yarn.

[0006]

According to the present invention, an object of the present invention is to provide a mixed fiber yarn comprising a low shrinkage yarn and a high shrinkage yarn, wherein (1) the low shrinkage yarn comprises all repeating units At least 85 of
Mol% is an aggregate of composite fibers composed of an alkali-sparing polyester component (first component) composed of ethylene terephthalate and an alkali-soluble polymer component (second component), and the composite fiber is composed of the first component: The two components are in the range of 70:30 to 95: 5 by weight, and the fiber cross-sectional shape is a substantially multilayered structure of the first component and the second component. The fibers are different from each other, and the single fiber fineness of the composite fiber is 0.8 to
3.0 denier, and the fineness of a single yarn substantially consisting of the first component after dissolving and removing the second component is 0.1 to 1.5 denier, and (2) the high shrinkage yarn is: The latent bulky ultrafine mixed yarn is characterized in that the boiling water shrinkage is in the range of 40 to 100%. Hereinafter, the latent bulky ultrafine mixed yarn of the present invention,
This will be described in more detail.

[0007] The mixed fiber of the present invention is composed of a fiber which shrinks into a core yarn after heat-shrink processing, and a composite fiber which becomes a sheath yarn without shrinking. Has a characteristic that the fineness is reduced.

FIG. 1 schematically shows an example of the fiber cross-sectional shape of the conjugate fiber of the present invention. In FIG. 1, 1 is an alkali-soluble polyester component (first component), 2 is an alkali-soluble polymer (second component),
The ratio of component: second component ranges from 70:30 to 95: 5 by weight. FIG. 2 is a schematic diagram of a fiber cross section showing a state in which the composite fiber in FIG. 1 is subjected to an alkali dissolution treatment, the second component is dissolved and removed, and the fiber is substantially split into a fiber composed of the first component.

As shown in FIG. 1, the cross-sectional shape of the conjugate fiber is such that the first component and the second component have a multi-layer bonded structure, and the bonded structure differs between fibers in the fiber cross section. The feature is that. Due to the difference (non-uniformity) in the cross-sectional structure between the fibers, an excellent texture with a soft feeling is achieved.

The cross-sectional shape of the conjugate fiber is shown in FIG.
As described above, the shape is preferably circular, but may be polygonal for the purpose of imparting a texture after the second component is eluted. The fineness of the conjugate fiber has a preferable fineness range from the viewpoint of improving the fuzz removal property and the soft feeling, and it is a single yarn of 0.8 to 3 De. By setting the single yarn De (denier) in this range, a soft feeling is obtained after weight loss, and the wings do not fall off. At the same time, the preferred compounding ratio of the second component is 5 to 30% by weight based on the total of the first component and the second component. If the composite ratio of the second component is less than 5% by weight, the soft fibril feeling after elution of the second component is insufficient,
On the other hand, if the content exceeds 30% by weight, a soft fibril feeling appears after the second component is eluted, but it takes a long time to elute, and the first component is damaged, so that the abrasion resistance is reduced and the sheath yarn is liable to fall off. The core thread is exposed and discolored. As a method of random conjugation (generally a multilayer structure or a method of forming a structure having different structures between fibers), kneading is performed by using a static mixer after melting, but the kneading is performed by adjusting the number of stages. The degree can be largely changed, and the number of steps having a soft texture and improving the fuzz-falling property is preferably 4 to 8 steps. If it is less than 4 steps, kneading unevenness is excessively produced, and the yarn length direction is largely ununiform. If it is more than 8 stages, it will be mixed too uniformly,
The large fineness portion is insufficient, and the improvement of the sheath thread shedding property is insufficient.

The individual fineness of the first component after weight loss is particularly preferably 1.5 De or less. The portion of 0.1 to 0.3 De is very effective for giving a soft texture, and it is excellent for removing fuzz from abrasion and not giving a rough feeling.
5 to 1.5 De works. Therefore, the composite fiber is 0.1 to 0.1.
A mixture of a part that gives a soft feel of 3De and a part that has a good fuzz shedding property of 0.5 to 1.5 De and does not give a rough feeling can simultaneously improve the fuzz shedding property and the soft hand. More desirable.

The high shrinkage yarn in the mixed fiber of the present invention may have a normal cross-sectional shape, but is preferably a hollow fiber having a hollow portion. The hollow portion referred to here may be any portion as long as the hollow portion exists within the fiber cross section.There is no particular problem with the position of the hollow portion, but the position of the hollow portion is determined by the stability of yarn production and the collapse of the fiber. It is preferably located at the center. The hollow ratio is the area of the hollow portion with respect to the cross-sectional area including the hollow portion calculated from the outer periphery of the fiber, and the hollow ratio is 10 to 40.
% Range. When the hollow ratio is less than 10%, the feeling of lightweight is insufficient. In particular, 1
If it is 5% or more, and if it exceeds 40%, the hollow portion tends to be crushed in steps such as yarn processing and weaving.

When the high-shrink yarn has a cross-sectional shape and a hollow portion, the shape is not particularly limited, but may be a circle, a triangle, a square, or any other polygon. However, the shape of the hollow portion is preferably a circle due to its stability. . Further, as a single yarn fiber (De) having good texture, firmness and firmness, it is 1.0 to 3.0.
De is particularly preferred.

In the mixed yarn comprising the high shrinkage yarn and the low shrinkage yarn, the low shrinkage yarn may be, for example, about 3,000 spun yarns.
The composite undrawn yarn (POY) spun at about m / min.
Relaxation heat treatment is performed in a temperature range of 00 to 130 ° C., and heat-setting at a temperature of 220 to 240 ° C. using a non-contact heater is used. The low-shrink fibers obtained after the heat treatment are aligned with the high-shrink yarns and supplied to the interlace nozzle with an overfeed of 1.0 to 1.5% to produce a mixed and entangled yarn.

In the blended yarn of the present invention, the low shrinkage yarn is a polyester composite undrawn yarn having a low shrinkage ratio of 5% or less,
The high shrinkage yarn is a high shrinkage core yarn polyester drawn yarn having a boiling water shrinkage ratio of 40% to 100%, and both are entangled with an interlace nozzle at 60 to 70 pieces / m.

The polymer constituting the mixed yarn and the combination thereof are not particularly limited, but polyester and polyamide can be preferably used, and any of a combination of polyesters and a combination of polyester and polyamide may be used. The main use of the fiber of the present invention is to dissolve and remove the second component of the conjugate fiber after processing into a fabric such as a woven fabric, and leave the first component as shown in FIG. The fabric is heat-treated and the composite fiber is exposed to the surface of the yarn to improve the softness and feel, and when the hollow fiber is used for the high shrinkage yarn, the fabric becomes lighter and more excellent in firmness and stiffness. is there. As the polymer forming the high shrinkage yarn, for example, polyester represented by polyethylene terephthalate is preferably used, and polyethylene terephthalate obtained by copolymerizing a copolymer component with 3 to 15 mol% is most preferable for the purpose of high shrinkage. Although a commonly used composition can be used as a preferable copolymer component, isophthalic acid and an ethylene oxide adduct of bisphenol A can be particularly preferably used.

The high shrinkage yarn has a boiling water shrinkage of 40 to 10
Suitably it is in the range of 0%, preferably 50-80%. The boiling water shrinkage is calculated by permeating the yarn into the boiling water for 30 minutes and measuring the yarn length before and after the permeation. That is, the length before contraction (L ₁ ) and the length after contraction (L ₂ ) are measured, and the value calculated by (L ₁ −L ₂ ) × 100 / L ₁ is defined as the contraction rate.

The low shrinkage yarn in the blended yarn of the present invention is in the form of a conjugate fiber, the first component of which comprises at least 85 mol%, preferably at least 90 mol% of the total repeating units.
Is a poorly soluble alkali polyester comprising ethylene terephthalate units, and is preferably a polyester substantially consisting of ethylene terephthalate. On the other hand, the second component forming the conjugate fiber is an alkali-soluble polymer, and its alkali dissolution rate constant is
It is desirable that the polymer is 10 times or more, preferably 20 to 70 times the polyester of the first component.

The solubility of the second component in an alkaline solvent is important relative to the solubility of the first component. This is because, when the second component in the conjugate fiber of the present invention is eluted by the solvent, it is preferable that only the second component is eluted and the first component is not substantially dissolved.

The polymer of the second component is preferably a polyester, since it forms a conjugate fiber with the polyester of the first component, and is particularly preferably copolymerized polyethylene terephthalate which is easily soluble in alkali. Particularly preferred are alkali-soluble copolymer polyesters which can be easily dissolved and removed at low cost, and specific examples include polyethylene terephthalate obtained by copolymerizing 4 to 15 mol% of a 5-sodium isophthalic acid component. Further, the conjugate fiber (low shrinkage yarn) of the present invention can be self-extensible, which is more preferable.

The sheath yarn of the mixed fiber of the present invention can be produced, for example, as follows. The second component is polyethylene terephthalate obtained by copolymerizing 5-sodium isophthalate at 5 mol%, and the first component is a non-copolymerized component. These polymers form a random-conjugated core-sheath composite stream of the first component and the second component as shown. On the other hand, the core yarn has high shrinkage,
For example, a polyethylene terephthalate copolymerized with 10.0 mol% of isophthalic acid or 10.0 mol% of bisphenol A is used for the purpose of imparting light weight.
The hollow fiber is obtained by discharging from a discharge hole composed of four slits as shown in FIG.

[0022]

The present invention will be specifically described below with reference to examples. In addition, the evaluation method in an Example is as follows. (1) Hollow ratio: A photograph of a fiber cross section of 100 times or more was taken, and the ratio (percentage) of the cross sectional area of the hollow portion corresponding to the cross sectional area of the entire fiber was determined. (2) Alkali dissolution rate constant: a dissolution rate constant obtained when a fiber obtained by spinning each component alone is heat-treated at 180 ° C. for 45 seconds and then boiled with a 35 g / l NaOH aqueous solution. Vol. 14, page 150 (1958). (3) Fineness of sheath yarn: A fiber cross-sectional photograph was taken by a transmission method, and the fineness of the first component (single fiber fineness; d) was determined from the cross-sectional area.

(4) Evaluation of texture: The fiber of the present invention was used for warp,
A woven fabric having a weaving density adjusted so that the basis weight after the weight reduction processing is the same as that of the weft yarn is produced. Weight loss processing was performed until the second component was substantially dissolved, and further, dry heat treatment was performed at 180 ° C. for 5 minutes, and the feeling was evaluated according to the following criteria. ◎: extremely soft and supple. ；: Soft feeling. Δ: Slightly rough and slightly soft X: Almost no soft feeling.

(5) Evaluation of abrasion: The abrasion was evaluated by the Martindale evaluation method. ◎: Class 3 at 10,000 times ○: Class 3 at 8,000 times △; Class 3 at 4,000 times ×; Class 3 at 2,000 times

(6) Evaluation of stiffness and lightness A sensitivity test was conducted by 10 persons, and the total score was evaluated. The following ranking was made according to the score. ◎; very good. ○: Somewhat good. Δ: slightly inferior. X; inferior.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.65 and having a limiting viscosity of 0.65 obtained by copolymerizing 6% by mole of isophthalic acid and 4.0% by mole of bisphenol A was used as a hollow fiber (core yarn), and 4.5% of sodium sulfoisophthalate was used. 5mol% copolymerized intrinsic viscosity 0.60
Was used as a second component, and polyethylene terephthalate having an intrinsic viscosity of 0.65 was used as a first component. The number of stages at the time of random conjugate of the first component and the second component of the sheath yarn was six, and the spinning was performed at a spinning speed of 3000 m / min. The core hollow hollow high-shrinkage yarn was discharged from an annular slit composed of four slits at a spinning speed of 1400 m / min, and after winding, stretched 3.0 times at 80 ° C. The wound sheath yarn is subjected to a relaxation heat treatment at a dry heat temperature of 100 ° C., and further heat-set at a temperature of 220 ° C. by a non-contact heater. This sheath thread is 1
The self-elongation at 30 ° C. was 20%. After heat treatment of the sheath yarn, the two yarns were aligned and fed with an interlace nozzle at an overfeed of 1.0%, and the mixed and entangled mixed yarn was evaluated as a woven fabric. Table 1 below shows the characteristics and evaluation results.
Shown in

Example 2 A test was performed in the same manner as in Example 1 except that the hollow ratio was changed by changing the slit shape of the discharge hole. The evaluation results are shown in Table 1 below.

Examples 3 to 6 The level in which the fineness of the first component of the sheath yarn was changed (Example 3),
Tests were carried out in the same manner as in Example 1 except for the above description, with respect to the level where the fineness of the component was changed (Example 4) and the level where the fineness of the core yarn was changed (Examples 5 and 6). The characteristics and the evaluation results are as shown in Table 1 below.

Comparative Examples 1 to 4 The kneadability of the first and second components of the sheath yarn was changed (Comparative Example 1), the fineness of the sheath yarn was changed (Comparative Example 2),
Tests were carried out in the same manner as in Example 1 except for the above description, with respect to the level where the mixing ratio of the component and the second component was changed (Comparative Example 3) and the level where the boiling water shrinkage of the core yarn was changed (Comparative Example 4). The characteristics and the evaluation results were as described in Table 1 below.

[0030]

[Table 1]

[0031]

According to the present invention, the latently bulky ultrafine mixed yarn of the present invention is obtained by mixing a sheath yarn random conjugate composite yarn and a core yarn hollow highly shrinkable yarn, processing the fabric, and dissolving and removing the second component of the sheath yarn. Can be The fabric eliminates discoloration due to the exposure of the core yarn due to shedding of the sheath yarn during wearing which could not be achieved by the prior art, and satisfactorily satisfies the softness of the surface and the weight reduction of the stiffness at the same time.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a fiber for explaining a cross-sectional shape of a conjugate fiber (sheath yarn) in a mixed fiber of the present invention.

FIG. 2 is a schematic cross-sectional view of a fiber obtained by dissolving and removing a second component of the conjugate fiber (sheath yarn) of the present invention.

FIG. 3 shows the shape of a slit hole that can be applied in the process of producing the fiber of the present invention with a high shrinkage (core yarn).

Continuation of the front page (51) Int.Cl. ⁷ identification code FI D01F 6/62 303 D01F 6/62 303K D06M 5/02 G (58) Investigated field (Int.Cl. ⁷ , DB name) D02G 3/04 D01F 8/14 D02G 1/18 D06M 11/38 D01F 6/62 303

Claims (5)

(57) [Claims] 1. A mixed yarn comprising a low shrinkage yarn and a high shrinkage yarn, wherein (1) the low shrinkage yarn is at least 85% of all repeating units.
Mol% is an aggregate of composite fibers composed of an alkali-sparing polyester component (first component) composed of ethylene terephthalate and an alkali-soluble polymer component (second component), and the composite fiber is composed of the first component: The two components are in the range of 70:30 to 95: 5 by weight, and the fiber cross-sectional shape is a substantially multilayered structure of the first component and the second component. The fibers are different from each other, and the single fiber fineness of the composite fiber is 0.8 to
3.0 denier, and the fineness of a single yarn substantially consisting of the first component after dissolving and removing the second component is 0.1 to 1.5 denier, and (2) the high shrinkage yarn is: A latent bulky ultrafine mixed fiber having a boiling water shrinkage in the range of 40 to 100%. 2. The latently bulky ultrafine yarn according to claim 1, wherein the high shrinkage yarn is a hollow yarn having a hollow ratio of 10 to 40% and a single yarn fineness of 1.0 to 3.0 denier. Mixed yarn. 3. The latently bulky ultrafine mixed fiber yarn according to claim 1, wherein the low shrinkage yarn is a self-extending yarn. 4. The latent bulky ultrafine mixed yarn according to claim 1, wherein the polymer of the second component has an alkali dissolution rate constant at least 10 times that of the polyester of the first component. 5. The latently bulky ultrafine mixed fiber according to claim 1, wherein the high shrinkage yarn is composed of a poorly soluble alkali component.