JP2628436B2 - Latent water-absorbing polyester composite hollow thick fiber yarn and its production method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latent water-absorbent polyester composite hollow and fine fiber yarn exhibiting excellent water absorbency and water wicking property by alkali weight reduction treatment, and exhibiting a soft feeling, and a method for producing the same. .

[0002]

2. Description of the Related Art Heretofore, the following methods have been known as methods for imparting water absorbency or sweat absorbency to polyester fibers. That is, (1) a method of performing a composite spinning of a polyester having a water-absorbing or sweat-absorbing polymer and a polyester (Japanese Patent Application Laid-Open No. 54-120731). (2) A method of imparting water absorption by making the fiber cross section into a special shape and utilizing the capillary phenomenon between fibers (Japanese Patent Application Laid-Open No. 60-259)
618 and JP-A-3-40811). (3) A method in which the cross section of the fiber is made into a hollow cross section to form micropores reaching the hollow portion from the fiber surface, and water absorption is imparted using the micropores and the hollow portion (Japanese Patent Publication No. 61-6183).

[0003]

However, the above method (1) has problems such as deterioration of the spinning property due to the combination of different polymers and difficulty in control in the dyeing process.
Further, the method (2) has a problem that the water absorption performance fluctuates due to the restrained state between constituent fibers, that is, the state of voids formed between the constituent fibers, and stable water absorption performance is not exhibited. The method (1) has problems such as a decrease in water absorption due to trapping of water and sweat in the hollow portion, generation of mold and off-flavor, and hardening of the hand based on the bending elasticity of the hollow cross-section fiber.

The present invention solves the above-mentioned conventional problems, and is a latent water-absorbing polyester which is easy to spin and dye, and exhibits excellent water absorption performance and water diffusion performance by alkali weight reduction treatment, and a soft feeling. The present invention provides a fiber and a method for producing the fiber.

[0005]

According to the present invention, there is provided a polyester (Component A) containing 95% by weight or more of polyethylene terephthalate, and a modified polyester (Component B) having an alkali weight loss rate at least 5 times that of Component A. , A side-by-side composite hollow thick and thin fiber yarn having a polymer ratio A component / B component of 1/1 to 4/1 and a hollow ratio of 5 to 30%, wherein each of the fibers constituting the yarn is The thick part having self-heating extensibility and the details having heat shrinkability exist randomly in the longitudinal direction and between the fibers, and the fiber extends along the fiber axis in the direction perpendicular to the fiber axis on the A component side of the thick part due to alkali reduction. A large number of transverse grooves reaching the hollow portion of the fiber, and a longitudinal groove extending in the fiber axis direction and reaching the hollow portion of the fiber on the B component side of the thick portion. In the composite hollow FutoshiHoso fiber yarn.

Further, the present invention provides a polyester containing at least 95% by weight of polyethylene terephthalate (component (A)).
And a modified polyester (component B) having an alkali weight loss rate of 5 times or more of the component A, a side-by-side composite hollow spinneret with a polymer ratio A component / B component = 1/1 to 4/1 for lamination. The undrawn yarn of the side-by-side composite hollow thick and thin fiber yarn spun so as to have a hollow ratio of 5 to 30% is used at a temperature equal to or lower than the crystallization temperature of the undrawn yarn and the residual elongation after drawing is obtained. And then drawn at a temperature not lower than the glass transition temperature and not higher than the crystallization temperature of the undrawn yarn, and between 1.001 and 1.04.
A process for producing a latent water-absorbent polyester composite hollow thick fiber yarn characterized by performing a heat treatment under a tension ratio of 0 times.

The present invention will be described in detail with reference to the drawings. FIG. 1 is a spinneret hole used for producing a latent water-absorbent polyester composite hollow thick fiber yarn according to the present invention, and FIGS. 2 and 3 show various examples of spun fibers. FIG. Polymer ratio A component / B component = 1/1, FIG.
FIG. 2 is a sectional view in the case of / 1. In FIG. 1, a represents a circular cross section, b represents a triangular cross section, and c represents a hole shape for producing a hollow fiber having a star-shaped cross section. 2, FIG. 3 is an enlarged sectional view corresponding to the die shape of FIG. FIG. 4 is an enlarged perspective view of a thick part of the circular cross-section fiber having a ratio A component / B component = 1/1 in FIG.
FIG. 5 is an enlarged perspective view of details of the fiber.

In the fiber of the present invention, the component B is completely or partially dissolved by the alkali weight reduction processing. FIG. 4 shows a portion where the B component (indicated by a dotted line) is completely dissolved by the alkali treatment, and FIG. 5 shows a portion where the B component is thinned by the alkali treatment. FIG.
There may be a portion shown by a circle and a portion shown by FIG. 5, or the fiber of FIG. 4 and the fiber of FIG. 5 may be mixed.

In FIGS. 4 and 5, the fiber of the present invention has a hollow portion (1), and extends in the direction perpendicular to the fiber axis to the A component side of the thick portion due to alkali weight reduction treatment. A), a large number of lateral grooves (2) reaching
On the B component side of the thick part, a vertical groove (3) is formed which extends in the fiber axis direction and reaches the hollow part. Therefore, a synergistic effect of the hollow part (1), the horizontal groove (2) and the vertical groove (3) is obtained. It exhibits excellent water absorption and divergence of absorbed water by its action. That is, the water that has come into contact with the fiber surface is mainly sucked into the hollow portion inside the fiber through a large number of lateral grooves (2), and the water sucked into the hollow portion (1) travels through the hollow portion to reduce the water vapor pressure. It is propagated to the lower part and is further effectively diverged outside the fiber through the flutes (3).

The lateral groove (2) generated and present on the A component side of the thick part has a length of 70% or less of the fiber outer periphery and a width of 1 μm.
Hereinafter, the number is 2 to 5 per 10 μ along the fiber longitudinal direction. When the transverse groove (2) exceeds these ranges, the strength of the fiber is reduced and the function as a garment fiber is lost. Further, the length of the vertical groove (3) generated on the B component side of the thick portion is 100 μ or less, and is limited by the length of the thick portion.
If it exceeds μ, the soft texture will be lost. Further, the width thereof may be smaller than the diameter of the hollow portion (1), that is, within the range until all the B components combined in the side-by-side type disappear due to alkali reduction.

In the yarn of the present invention, the thick part of each fiber constituting the yarn has self-heating extensibility and the details have heat shrinkage. The thick part where the horizontal grooves and vertical grooves are generated floats on the surface of the yarn, so that the water absorption and diffusion effects by the horizontal grooves and vertical grooves are more effectively exhibited, and a dry and soft feeling is obtained. .

The A component used in the present invention is a polyester substantially consisting of polyethylene terephthalate containing 95% by weight or more of polyethylene terephthalate, while the B component is desirably faster than the A component as much as possible in reducing the alkali weight loss. This is because the purpose of the present invention is to form a vertical groove reaching the hollow part by utilizing the difference in the alkali weight loss rate between the component A and the component B, and the ratio of the A and B polymers is 1 : 1, it is necessary that the difference in weight loss rate is large. If the weight loss rate ratio is 5 times or less, the B component dissolves and the A polymer dissolves and loses more than necessary when the hollow portion is exposed. Therefore, a weight reduction rate ratio of 5 times or more is required. Desirably, it is about 10 times. Specifically, the component B is a polyester copolymer obtained by copolymerizing ethylene terephthalate as a main structural unit, 1.5 to 3.5 mol% of a 5-sodium sulfoisophthalic acid component as a dicarboxylic acid component, and 2 to 7 mol% of an adipic acid component. A modified polyester made of a polymer is preferably used.

In the fiber yarn of the present invention, the component A and the component B are as shown in FIGS. 2 and 3 (a), (b) and (c).
The polymer ratio of the lamination is A component / B component = 1/1 to 1
In 4/1, the side-by-side composite hollow fine spinning was performed using the side-by-side composite hollow spinneret shown in (a), (b), and (c) of FIG. 1 so that the hollow ratio was 5 to 30%. Unstretched yarn of the fiber yarn, at a temperature not higher than the crystallization temperature of the unstretched yarn, and the residual elongation after stretching is 70 to
The film is stretched at a magnification of 90%.

The stretching is described in JP-A-60-39411,
By employing the method disclosed in Japanese Patent Application Laid-Open No. 61-146,836, a hollow thick and thin fiber yarn is obtained. Next, the undrawn yarn can be produced by heat treatment at a temperature not lower than the glass transition temperature and not higher than the crystallization temperature and at a tension ratio of 1.001 to 1.040 times, and thereafter, a weight reduction rate of 10 to 40. %, The above-mentioned horizontal grooves and vertical grooves are generated.

The unstretched portion and the stretched portion of the thick fiber are mixed, so that the high elongation portion and the low elongation portion are mixed along the longitudinal direction of the fiber. This is a major cause of fluctuations in the tension of the processing in the subsequent process, for example, when false twisting is performed, and impairs the processing stability. However, by setting the residual elongation of the drawn yarn to 70 to 90%, Post-processing can be performed stably by absorbing fluctuations in processing tension.

[0016] The hollow ratio of the fiber according to the present invention must be 5 to 30%.
If it exceeds 30%, a normal hollow cross section cannot be obtained in the spinning stage, and the hollow ratio is significantly reduced due to the cross-sectional deformation in the processing stage, thereby achieving the object of the present invention. Can not.

[0017] The polymer ratio of the lamination must be A component / B component = 1/1 to 4/1. B component is 20%
If it is less than 3, the B component does not reach the hollow portion as shown in FIG. 6, and the vertical groove (3) does not occur. In some cases, fibers having a large variation in polymer ratio between fibers and no B component are generated. Combining 50% or more of the B component
The dissolution loss of the B component due to the alkali weight reduction treatment is large, and it becomes difficult to maintain the fiber strength and the hollow cross section.

If the stretching temperature exceeds the crystallization temperature of the undrawn yarn, partial crystallization of the undrawn yarn proceeds before the drawing is performed, and the process of cutting the heat-embrittled single fiber of the thick portion and the like occurs. It will cause upset.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. The water absorption performance in the examples and comparative examples was evaluated by the water droplet disappearance time and the Larose method.

[Water drop disappearance time] A test piece of 20 cm x 20 cm was collected from a plain woven fabric using a sample original yarn as a weft, and the test piece was attached to a metal ring having a diameter of 15 cm, and the test piece was attached to a metal ring having a diameter of 20 ± 2.
The distance from a burette filled with distilled water at a temperature of 1 ° C. (which can divide 1 ml of water into 25 ± 3 drops) was set to 1 cm, and a drop of water dropped on the test piece. The time until the reflection disappears is measured and expressed as an average of 10 measurements.

[Larose Method] Using a Larose method water absorption measuring device TL-01 manufactured by Toyobo Engineering Co., Ltd., a circular sample of a plain woven fabric using a sample original yarn as a weft was placed on a hydrated horizontal glass filter. The sample is set, a load of 480 g is applied to the sample, the amount of water that the sample sucks up through the glass filter is measured for 30 seconds, and the water absorption is calculated from an average value of five measurements.

(Example 1) Polyethylene terephthalate containing 0.5% by weight of titanium oxide and having an intrinsic viscosity [η] of 0.65 was used as an A component, ethylene terephthalate was used as a main constituent unit, and 5-sodium sulfo acid was used as a dicarboxylic acid component. A modified polyester consisting of a polyester copolymer obtained by copolymerizing 1.5 to 3.5 mol% of an isophthalic acid component and 2 to 7 mol% of an adipic acid component as a B component,
In the ratio of A component / B component = 2/1, spinning holes having an outer diameter of 2 mm and a slit width of 0.1 mm in the shape shown in FIG.
Using a side-by-side type composite hollow spinneret having the same, spinning was performed at a spinning temperature of 285 ° C. and a winding speed of 1800 m / min to obtain an undrawn yarn having a hollow ratio of 20% and a fineness of 155d / 30f. The glass transition temperature of the undrawn yarn measured by dilatometry was 70 ° C, and the crystallization temperature measured by a scanning calorimeter was 127 ° C.

The undrawn yarn was drawn at a draw ratio of 1.535 times at a temperature of 105 ° C., and subsequently heat-treated at a tension ratio of 1.015 and a temperature of 120 ° C. to obtain a composite hollow thick and thin fiber yarn.
After weaving a plain fabric using the composite hollow thick fiber yarn as the weft, an alkali weight reduction treatment was performed at a weight loss rate of 20%. Various water absorption performance of the obtained woven fabric, hand, and horizontal grooves of constituent fibers,
Table 1 shows the length, width, number, and the like of the vertical grooves.

(Example 2) The polymer ratio of Example 1 was changed to A
Spinning was performed while changing the ratio of component / B component to 1/1, and thereafter, stretching, weaving, and alkali reduction were performed under the same conditions as in Example 1. Table 1 shows various water-absorbing performances and feelings of the obtained woven fabrics, and lengths, widths, numbers, and the like of the horizontal and vertical grooves of the constituent fibers.

Comparative Example 1 The undrawn yarn obtained in Example 1 was drawn at a preheating temperature of 85 ° C., at a draw ratio of 1.011 × 2.079, and
Normal stretching is performed at a heat setting temperature of 145 ° C.
A composite hollow fiber yarn having a uniform thickness of 0% without fineness was formed. Using this yarn, weaving and alkali reduction treatment were performed in the same manner as in Example 1. Table 1 shows various water absorption performances of the obtained woven fabric.

(Comparative Example 2) The same polyester as used in Example A as a component A was spun at a spinning temperature of 285 using a spinneret having 30 circular spinnerets having a hole diameter of 0.25 mm.
At a winding speed of 1800 m / min and a fineness of 155 d /
An undrawn yarn having a circular cross section of 30f was obtained. This undrawn yarn was subjected to drawing and tension heat treatment under the same conditions as in the example to form a circular cross section thick and thin fiber yarn, and subjected to weaving and alkali reduction treatment as in the example. Table 1 shows various water absorption performances of the obtained woven fabric.
It was shown to.

[0027]

[Table 1]

[0028]

The latent water-absorbent polyester composite hollow thick and thin fiber yarn according to the present invention constituted as described above can be easily formed and dyed, and has excellent water absorbing performance and water discharging performance by alkali reduction treatment. And excellent effects such as exhibiting a soft touch.

[Brief description of the drawings]

FIG. 1 is a plan view showing a spinneret used for producing a hollow fiber having a latent water-absorbing polyester composite.

FIG. 2 is an enlarged cross-sectional view of a fiber bonded with A component / B component = 1/1.

FIG. 3 is an enlarged cross-sectional view of fibers bonded together at A component / B component = 2/1.

FIG. 4 is an enlarged perspective view of a thick portion after an alkali weight reduction process.

FIG. 5 is an enlarged perspective view of details after the alkali weight loss treatment.

FIG. 6 is an enlarged cross-sectional view of the fiber when the B component, which is the lower limit of the polymer ratio of the lamination, is 20% or less.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow part 2 Horizontal groove 3 Vertical groove A A component B B component

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location D02J 1/22 D02J 1/22 Q D03D 15/00 D03D 15/00 A D06M 11/38 D06M 5 / 02 G

Claims (5)

(57) [Claims] 1. A polyester containing at least 95% by weight of polyethylene terephthalate (component (A)),
Modified polyester (B
Component), and the polymer ratio of the laminated A component /
Component B is a side-by-side composite hollow thick fiber yarn having a 1/1 to 4/1 hollow ratio of 5 to 30%, and self-heating elongation in the longitudinal direction of each fiber constituting the yarn and between the fibers. The thick part having the property and the details having the heat shrinkability are randomly present, and further, on the A component side of the thick part due to the reduction in alkali, there are many transverse grooves extending in the direction perpendicular to the fiber axis and reaching the hollow part of the fiber. A latent water-absorbent polyester composite hollow thick fiber yarn characterized by having a longitudinal groove extending in the fiber axis direction and reaching the hollow portion of the fiber on the B component side of the thick portion. 2. The B component of the thick part, wherein the length of the transverse groove generated on the side of the A component of the thick part is 70% or less of the outer circumference of the fiber, the width is 1 μ or less, and the number is 2 to 5 per 10 μ in the fiber axial direction. The latent water-absorbent polyester composite hollow thick fiber yarn according to claim 1, wherein the length of the vertical groove present on the side is 100 µ or less. 3. The component B comprises ethylene terephthalate as a main constituent unit, and a dicarboxylic acid component comprising 5-sodium sulfoisophthalic acid component in an amount of 1.5 to 3.5 mol%.
3. The hollow fiber filament of claim 1 or 2, which is a modified polyester comprising a polyester copolymer obtained by copolymerizing 2 to 7 mol% of an adipic acid component. 4. A polyester (component A) containing 95% by weight or more of polyethylene terephthalate, and 5% of component A
Modified polyester (B
Component) and a side-by-side composite hollow fiber spun using a side-by-side composite hollow spinneret with a bonding polymer ratio of A component / B component = 1/1 to 4/1 so that the hollow ratio becomes 5 to 30%. The unstretched yarn of the fine fiber yarn is stretched at a temperature not higher than the crystallization temperature of the unstretched yarn and at a ratio at which the residual elongation after stretching is 70 to 90%. A process for producing a latently water-absorbent polyester composite hollow thick fiber yarn, which comprises heat-treating at a transition temperature or higher and a crystallization temperature or lower and at a tension ratio of 1.001 to 1.040 times. 5. The component B is mainly composed of ethylene terephthalate, and the dicarboxylic acid component is 1.5 to 3.5 mol of a 5-sodium sulfoisophthalic acid component.
5. The method of claim 4, wherein a modified polyester comprising a polyester copolymer obtained by copolymerizing the adipic acid component with 2 to 7 mol% is used. 5.