JPH06257018A - Latent water-absorbent conjugate hollow thick and thin polyester fiber yarn and its production - Google Patents

Abstract

PURPOSE:To obtain a latent water-absorbing polyester fiber having easy dyeability and spinnability to form yarn and exhibiting excellent water-absorbing performance, dissipation performance of absorbed water and soft feeling by alkali thinning treatment. CONSTITUTION:The fiber is a side-by-side conjugate hollow polyester fiber having uneven denier and a hollowness ratio of 10-30% and composed of a polyester (the component A) containing <=95wt.% of polyethylene terephthalate and a modified polyester (the component B) having an alkali-thinning rate higher than that of the component A. Thick denier parts having spontaneous thermal extensibility and a thin denier parts having thermal shrinkability are randomly distributed in the longitudinal direction of each fiber constituting the yarn and between each fiber. A number of lateral grooves extending in the direction perpendicular to the fiber axis to the hollow part of the fiber are generated in the component A of the thick denier part by alkali thinning treatment and longitudinal grooves extending in the direction of the fiber axis to the hollow part of the fiber are generated at the B component of the thick denier part.

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 thick fiber yarn exhibiting excellent water absorbency and wicking property of absorbed water by alkali reduction treatment, and soft texture, and a method for producing the same. It is a thing.

[0002]

2. Description of the Related Art Heretofore, the following methods have been known as methods for imparting water absorbency and sweat absorbency to polyester fibers. That is, (1) a polymer having water absorbency and sweat absorbency
And (2) a method of composite spinning polyester and polyester, (2) a method of imparting water absorption by utilizing a capillary phenomenon between fibers by making the fiber cross section into a special shape, and (3) making the fiber cross section a hollow cross section from the fiber surface For example, a method of forming fine pores reaching the hollow portion and imparting water absorption by using the fine pores and the hollow portion.

[0003]

However, the above method (1) has problems such as deterioration of the spinnability due to the combination of different polymers and difficulty in management in the dyeing process, and (2) The method of (3) has a problem that the water absorption performance varies depending on the restrained state between the constituent fibers, that is, the state of voids formed between the constituent fibers, and the stable water absorption performance is not exhibited. There were problems such as a decrease in water repellent property due to the trapping of water and sweat, generation of mold and offensive odor, and hardening of the texture due to the high bending elasticity of the hollow cross-section fiber.

The present invention solves the above-mentioned conventional problems, is easy to make yarns and dyes, and has a latent water-absorbing polyester that exhibits excellent water absorption performance and water absorption performance due to alkali reduction treatment, and soft texture. The present invention provides a fiber and a manufacturing method thereof.

[0005]

SUMMARY OF THE INVENTION The present invention is a hollow product comprising a polyester containing 95% by weight or more of polyethylene terephthalate (component A) and a modified polyester (component B) having an alkali weight loss rate higher than that of component A. A side-by-side type composite hollow thick and thin fiber yarn having a rate of 10 to 30%, a thick portion having self-heating extensibility and a heat shrinkability in the longitudinal direction of each fiber constituting the yarn and between each fiber. And Randomly exist, and due to the alkali weight reduction treatment, a large number of lateral grooves extending in the direction perpendicular to the fiber axis and reaching the hollow part of the fiber are generated on the A component side of the thick part, and on the B component side of the thick part. A latent water-absorbent polyester composite hollow thick and thin fiber yarn characterized by the fact that vertical grooves extending in the axial direction of the fiber and reaching the hollow part of the fiber are generated, and polyethylene terephthalate with 95 weights. % Or more of the polyester (component A) and a modified polyester having a higher alkali weight loss rate than the component A (component B) were spun using a side-by-side type composite hollow spinneret so that the hollow ratio was 10 to 30%. The undrawn yarn of the side-by-side type composite hollow fiber yarn is drawn at a temperature equal to or lower than the crystallization temperature of the undrawn yarn and at a ratio such that the residual elongation after drawing is 70 to 90%, and then the undrawn yarn is drawn. A gist of a method for producing a water-absorbent polyester composite hollow thick fiber yarn characterized by heat-treating at a temperature not lower than a glass transition temperature and not higher than a crystallization temperature and a tension ratio of 1.001 to 1.040 times Is.

The present invention will be described in more detail with reference to the drawings. FIG. 1 shows various examples of spinneret holes and fibers spun from them which are used in the production of the latent water-absorbent polyester composite hollow thick fiber yarn according to the present invention. 2 is an enlarged perspective view of a thick portion of the latent water-absorbent polyester composite hollow thin fiber according to the present invention after alkali reduction treatment, and FIG. 3 is a latent water-absorbent polyester composite hollow thin fiber according to the present invention FIG. 2 and FIG. 3 are enlarged perspective views of details after alkali weight reduction processing.
In the fiber of the present invention, a hollow portion 3 is present, and a large amount of lateral grooves 1 extending in the direction perpendicular to the fiber axis and reaching the hollow portion are formed on the component A side of the thick portion due to the alkali weight reduction treatment, and On the B component side of the portion, a vertical groove 2 that extends in the fiber axis direction and reaches the hollow portion is generated. Therefore, excellent water absorption and water absorption are achieved by the synergistic action of the hollow portion 3, the horizontal groove 1, and the vertical groove 2. Exhibits water divergence. That is, the water contacted with the fiber surface is mainly sucked into the hollow portion inside the fiber through a large number of lateral grooves 1, and the water sucked into the hollow portion 3 is transmitted through the hollow portion 3 to a portion having a lower water vapor pressure. It is propagated and further effectively radiated to the outside of the fiber through the flutes 2.

The hollow ratio of the fiber according to the present invention is 10 to 30.
%, The transverse groove cannot reach the hollow part 3 if it is less than 10%, and if it exceeds 30%, a normal hollow section cannot be obtained at the spinning stage and the cross-section deformation at the processing stage. As a result, the hollow ratio is remarkably reduced and the object of the present invention cannot be achieved. Further, the lateral groove 1 generated on the A component side of the thick portion has a length of 70% or less of the outer circumference of the fiber, a width of 1 μ or less, and the number is 2 to 5 per 10 μ along the fiber longitudinal direction. When it exceeds, the strength of the fiber is lowered and the function as a fiber for clothing is lost. B in the thicker part
The length of the vertical groove 2 generated on the component side is 100 μ or less and is limited by the length of the thick portion, and if it exceeds 100 μ, the soft texture is lost. The width may be equal to or less than the diameter of the hollow portion 3, that is, within a range in which all the B components compounded in the side-by-side type are eliminated by the alkali weight loss. % Or less is desirable.

In the yarn of the present invention, the thick portion of each fiber constituting the yarn has self-heating extensibility and the details have heat shrinkability. The thick part where horizontal grooves and vertical grooves are generated by the treatment is raised above the surface of the yarn. This makes the water absorption and divergence effects of the horizontal grooves and vertical grooves more effective, and also provides a dry and soft texture. Is obtained.

The component A used in the present invention is a polyester consisting essentially of polyethylene terephthalate containing 95% by weight or more of polyethylene terephthalate, while the component B has a higher alkali reduction rate than the component A. Quality polyester, specifically, 0.1 to 10% by weight of polyalkylene glycol having an average molecular weight of 5000 or more and 0.05 to 5% of an organic sulfonic acid metal salt represented by the following general formula [1]. A modified polyester containing ethylene terephthalate as the main repeating unit, which is contained by weight, is preferably used. R-SO ₃ M ───────── [1] (In the formula, R represents an alkyl group having 3 to 30 carbon atoms, and M represents an alkali metal.)

The fiber yarn of the present invention comprises a spinneret having side-by-side type composite hollow spinneret holes as shown in FIGS. 1 (a), 1 (b) and 1 (c), in which component A and component B are used. The undrawn yarn of the side-by-side type composite hollow fiber yarn spun to have a hollowness of 10 to 30% has a residual elongation of 7 or less at a temperature not higher than the crystallization temperature of the undrawn yarn.
It is produced by drawing at a draw ratio of 0 to 90%, and then heat-treating at a temperature not lower than the glass transition temperature and not higher than the crystallization temperature of the unstretched yarn and a tension ratio of 1.001 to 1.040 times. And a weight loss rate of 15-40
The desired horizontal groove and vertical groove can be generated by carrying out the alkali reduction treatment of 10%.

Since the undrawn portion and the drawn portion are mixed in the thick and thin fibers, the high elongation portion and the low elongation portion are mixed along the longitudinal direction of the fiber. This is a major cause of tension fluctuations in the post-process, for example, false twisting, and impairs process stability. However, by adjusting the residual elongation of the drawn yarn to 70 to 90%, the post-process It is possible to absorb the fluctuations in the tension and stably perform the post-processing. Further, when the drawing temperature exceeds the crystallization temperature of the undrawn yarn, partial crystallization proceeds in the undrawn yarn before the drawing is performed, and a high degree of dispersion state between the thick portion and the fine portion cannot be achieved, and This causes process malfunction such as thermal embrittlement of single fibers in the thick part.

[0012]

EXAMPLES The present invention will be described in more detail based on the following examples. The water absorption performance in the examples and comparative examples was evaluated by the water drop disappearance time and the Laurose method.

[Water Drop Disappearing Time] A 20 cm × 20 cm test piece was sampled from a plain woven fabric using a raw yarn as a weft, the test piece was attached to a metal ring having a diameter of 15 cm, and a burette containing distilled water was placed in the test piece. Set the distance between the test piece and the burette to 1 cm and add distilled water at 20 ± 2 ℃ at a rate of 0.05 cc / drop every 5 seconds until the test piece absorbs the water drop and the mirror reflection disappears. Is measured and expressed as the average of 10 measurements.

[Lallose method] Using a Larose method water absorption measuring device TL-01 manufactured by Toyobo Engineering Co., Ltd., a sample raw yarn is used as a weft on a horizontal glass filter which is hydrated. Set a circular sample of plain woven fabric, load a load of 480g on the sample, measure the amount of water absorbed by the sample through the glass filter in a predetermined time, and calculate the water absorption rate from the average value of 5 measurements. .

Example 1 Polyethylene terephthalate having an intrinsic viscosity [η] = 0.65 containing 0.5% by weight of titanium oxide was used as the component A, 3 mol% of polyethylene glycol having a molecular weight of 20,000 and an alkyl sulfone. Side-by-side type composite hollow spinneret having 30 spinning holes having an outer diameter of 3 mm and a slit width of 0.1 mm as shown in FIG. Spinning temperature is 290 ° C., winding speed is 1800 m / min, and hollow ratio is 20%, fineness is 160
An undrawn yarn of d / 30f was obtained. The glass transition temperature of this undrawn yarn measured by the dilatometry method was 70 ° C, and the crystallization temperature measured by a scanning calorimeter was 127 ° C.

The unstretched yarn was stretched at a draw ratio of 1.550 times at a temperature of 110 ° C., and subsequently heat treated at a tension ratio of 1.015 at a temperature of 120 ° C. to obtain a composite hollow thick fiber yarn. After weaving a plain woven fabric using this composite hollow thick and thin fiber yarn as a weft, an alkali weight loss treatment was applied at a weight loss rate of 20%. Various water absorption performance of the obtained fabric, texture, and lateral grooves of constituent fibers,
Table 1 shows the length, width and number of the warp grooves.

(Comparative Example 1) The undrawn yarn obtained in the example was normally drawn at a drawing preheating temperature of 85 ° C, a draw ratio of 1.011 x 2.150 and a heat setting temperature of 150 ° C, and a residual elongation of 30%.
The composite hollow fiber yarn of uniform thickness with no thickness was prepared, and this yarn was subjected to weaving and alkali reduction treatment in the same manner as in the example. Various water absorption performances of the obtained woven fabric are shown in Table 1.

(Comparative Example 2) The same polyester as that used as the component A in Example was used, and the spinning temperature was 290 using a spinneret having 30 circular spinneret holes having a hole diameter of 0.25 mm.
Spinning at ℃, winding speed 1800m / min, fineness 160d /
An undrawn yarn having a circular cross section of 30f was obtained. The unstretched yarn was stretched and tension heat-treated under the same conditions as in the example to form a thick fiber yarn having a circular cross section, and woven and alkali weight-reduced as in the example. The various water absorption performances of the resulting fabric are shown in Table 1.
It was shown to.

[0019]

[Table 1]

[0020]

EFFECT OF THE INVENTION The latent water-absorbent polyester composite hollow thick fiber yarn according to the present invention constructed as described above is easy to make and dye, and has excellent water absorption performance and water wicking performance due to alkali weight reduction treatment. It also has excellent effects such as exhibiting a soft texture.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing various examples of a spinneret hole used for producing a latent water-absorbent polyester composite hollow thick fiber yarn according to the present invention and fibers spun from them.

FIG. 2 is an enlarged perspective view of a thick portion of the latent water-absorbent polyester composite hollow thick and thin fiber according to the present invention after alkali reduction treatment.

FIG. 3 is an enlarged perspective view of details of the latent water-absorbent polyester composite hollow thick and thin fiber according to the present invention after alkali weight reduction treatment.

[Explanation of symbols]

 1 horizontal groove 2 vertical groove 3 hollow part

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 12, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[Lallose method] Using a Larose method water absorption measuring device TL-01 manufactured by Toyobo Engineering Co., Ltd., a sample raw yarn is used as a weft on a horizontal glass filter which is hydrated. Set a circular sample of plain woven fabric, load 480g on this sample, measure the amount of water absorbed by the sample through the glass filter in 30 seconds , and calculate the water absorption rate from the average value of 5 measurements. .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

[0019]

[Table 1]

Claims (5)

[Claims] 1. A side-by-side type having a hollow ratio of 10 to 30%, which comprises 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 higher than that of component A. A composite hollow thick and thin fiber yarn, wherein a thick portion having self-heating extensibility and a heat shrinkable detail are randomly present in the longitudinal direction of each fiber constituting the yarn and between each fiber. Due to the alkali weight reduction treatment, a large number of lateral grooves extending to the A component side of the thick portion in the direction perpendicular to the fiber axis and reaching the hollow portion of the fiber are generated, and the B component side of the thick portion extending in the fiber axis direction and A latent water-absorbent polyester composite hollow thick and thin fiber yarn characterized in that vertical grooves reaching the hollow portion are generated. 2. A lateral groove generated on the A component side of the thick portion has a length of 70% or less of the outer circumference of the fiber, a width of 1 μ or less, and the number is 2 to 5 per 10 μ in the fiber axial direction, and the B component of the thick portion. The latent water-absorbent polyester composite hollow thick and thin fiber yarn according to claim 1, wherein the length of the longitudinal groove existing on the side is 100 μm or less. 3. As the component B, 0.1 to 10% by weight of polyalkylene glycol having an average molecular weight of 5000 or more and 0.1 to 10% of an organic sulfonic acid metal salt represented by the following general formula [1] is used.
The latent water-absorbent polyester composite hollow thick fiber yarn according to claim 1 or 2, wherein a modified polyester containing ethylene terephthalate as a main repeating unit is contained in an amount of 05 to 5% by weight. R-SO ₃ M ───────── [1] (In the formula, R represents an alkyl group having 3 to 30 carbon atoms, and M represents an alkali metal.) 4. A side-by-side type composite hollow spinneret is used to prepare a polyester (A component) containing 95% by weight or more of polyethylene terephthalate and a modified polyester (B component) having a higher alkali weight loss rate than the A component. The undrawn yarn of the side-by-side type composite hollow fiber yarn spun to have a hollowness of 10 to 30% has a residual elongation of 70 to 90 at a temperature not higher than the crystallization temperature of the undrawn yarn.
% At a temperature not lower than the glass transition temperature of the unstretched yarn and not higher than the crystallization temperature, and 1.001
A method for producing a latently water-absorbent polyester composite hollow thin fiber yarn, which comprises heat treatment at a tension ratio of 1.040 times. 5. As component B, 0.1 to 10% by weight of polyalkylene glycol having an average molecular weight of 5000 or more and 0.1 to 10% of an organic sulfonic acid metal salt represented by the following general formula [1] is used.
The method for producing a latent water-absorbent polyester composite hollow thick fiber yarn according to claim 4, wherein a modified polyester containing 05 to 5% by weight as a main repeating unit is ethylene terephthalate is used. R-SO ₃ M ───────── [1] (In the formula, R represents an alkyl group having 3 to 30 carbon atoms, and M represents an alkali metal.)