JPH06108312A - Latently water absorbing polyester conjugate hollow thick and thin fiber yarn and its production - Google Patents

Abstract

PURPOSE:To obtain latently water absorbing polyester conjugate hollow thick and thin fiber yarn, capable of readily performing yarn manufacturing and dyeing and having excellent water absorptivity and water dispersibility and soft hand by the weight reduction treatment with an alkali. CONSTITUTION:This latently water absorbing polyester conjugate hollow thick and thin fiber yarn is a side-by-side type conjugate hollow thick and thin fiber yarn composed of a polyester (component A) and a modified polyester (component B) having an alkali weight reduction rate of >=5 times that of the component (A) and 5-30% percentage of hollowness at (1/1) to (4/1) ratio of the components (A)/(B). A thick part having spontaneous thermal extensibility and a thin part having heat shrinkage properties are randomly present in the longitudinal direction of each fiber and between the fibers in this yarn and many transverse grooves 2, extending in the direction at right angles from the fiber axis and simultaneously reaching a hollow part 1 of the fiber are present on the side of the component (A) in the thick part. Longitudinal grooves 3, extending in the fiber axial direction and simultaneously reaching the hollow part of the fiber are present on the side of the component (B) in the thick 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 that exhibits excellent water absorbency and water wicking property due to alkali reduction treatment, and soft texture, and a method for producing the same. .

[0002]

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

[0003]

However, the above method (1) has problems such as deterioration of the spinnability due to the combination of different polymers and difficulty of management in the dyeing process.
Further, the method (2) has a problem that the water absorption performance is varied due to the restrained state between the constituent fibers, that is, the void state formed between the constituent fibers, and the stable water absorption performance is not exhibited. The method described above has problems such as a decrease in water absorption due to the trapping of water and sweat in the hollow portion, 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 problems of the prior art, 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]

DISCLOSURE OF THE INVENTION The present invention comprises 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 5 times or more that of component A. Which is a side-by-side composite hollow thick fiber yarn having a polymer ratio A component / B component = 1/1 to 4/1 and a hollow ratio of 5 to 30%, which is composed of each fiber constituting the yarn. Thick portions having self-heating extensibility and fine details having heat shrinkability randomly exist in the longitudinal direction and between each fiber, and further, due to alkali reduction, the A component side of the thick portion extends in the direction perpendicular to the fiber axis and the fibers. There are a number of lateral grooves that reach the hollow portion of the fiber, and there are longitudinal grooves that extend in the fiber axis direction and reach 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 is 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 of 5 times or more that of component A, a side-by-side composite hollow spinneret with a polymer ratio of component A component / B component = 1/1 to 4/1. The unstretched yarn of the side-by-side type composite hollow thick and thin fiber yarn spun to have a hollowness of 5 to 30% is used at a temperature equal to or lower than the crystallization temperature of the unstretched yarn and the residual elongation after stretching. Drawn at a draw ratio of 70 to 90%, then at a temperature not lower than the glass transition temperature and not higher than the crystallization temperature of the unstretched yarn, and 1.001 to 1.04.
This is a method for producing a latent water-absorbent polyester composite hollow thick fiber yarn, which is characterized by 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 in the production of a latent water-absorbent polyester composite hollow thick fiber yarn according to the present invention, and FIGS. 2 and 3 are various examples of spun fibers. Polymer ratio A component / B component = 1/1, 2 in FIG.
It is sectional drawing in the case of / 1. In FIG. 1, (a) is a circular cross section, (b) is a triangular cross section, and (c) is a spinneret hole shape for manufacturing hollow fibers having a star-shaped cross section. 2 and FIG. 3 are shown as enlarged sectional views corresponding to the die shape of FIG. FIG. 4 is an enlarged perspective view of a thick portion of the circular cross-section fiber of FIG. 2A having a polymer bonding ratio of A component / B component = 1/1 after alkali reduction,
FIG. 5 is an enlarged perspective view of details of the fiber.

In the fiber of the present invention, the B component is wholly or partially dissolved by the alkali weight reduction process. FIG. 4 shows a portion where the B component (shown 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. Figure 4
There may be a portion shown by and the portion shown in FIG. 5, or the fibers of FIG. 4 and the fibers of FIG. 5 may be mixed.

In FIGS. 4 and 5, the fiber of the present invention has a hollow portion (1), and due to the alkali weight reduction treatment, the thick portion A component side extends in the direction perpendicular to the fiber axis and the hollow portion (1). ), A large number of lateral grooves (2) are formed, and
Since a vertical groove (3) that extends in the fiber axis direction and reaches the hollow portion is generated on the B component side of the thick portion, the hollow portion (1), the horizontal groove (2), and the vertical groove (3) are combined. Due to its action, it exhibits excellent water absorption and wicking properties of absorbed water. That is, the water contacted with the fiber surface is sucked into the hollow portion inside the fiber mainly through a large number of lateral grooves (2), and the water sucked into the hollow portion (1) travels through the hollow portion and is absorbed by the steam pressure. It is propagated to the lower part and is effectively diverged to the outside of the fiber via the flutes (3).

The transverse groove (2) generated and present on the A component side of the thick portion has a length of 70% or less of the fiber outer circumference and a width of 1 μm.
Below, the number is 2 to 5 per 10 μm along the longitudinal direction of the fiber. When the lateral groove (2) exceeds these ranges, the strength of the fiber is lowered and the function as a fiber for clothing is lost. Furthermore, the length of the vertical groove (3) generated on the B component side of the thick portion is 100 μm 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 equal to or less than the diameter of the hollow portion (1), that is, within a range in which all the component B compounded in the side-by-side type is eliminated by the alkali reduction.

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 is floated on the surface of the yarn, so that the water absorption and divergence effects of the horizontal grooves and vertical grooves are more effectively exhibited, and 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. On the other hand, it is desirable that the component B has a faster alkali weight reduction rate than the component A. This is because the present invention aims to form a flute that reaches the hollow portion by utilizing the difference in the alkali weight loss rates of the A component and the B component, and the ratio of the A and B polymers is 1. The closer it is to 1, the larger the difference in weight reduction rate needs to be. When the weight reduction rate ratio is 5 times or less, the B component is dissolved and the A polymer is unnecessarily dissolved and lost when the hollow portion is exposed. Therefore, a reduction speed ratio of 5 times or more is required. It is preferably about 10 times. Specifically, the component B is a polyester copolymer obtained by copolymerizing ethylene terephthalate as a main constituent unit, a dicarboxylic acid component of 5-sodium sulfoisophthalic acid component of 1.5 to 3.5 mol% and an adipic acid component of 2 to 7 mol%. A modified polyester made of a polymer is preferably used.

The fiber yarn of the present invention has the above-mentioned A component and B component as shown in FIGS. 2 and 3 (a), (b) and (c).
The ratio of the laminated polymers is A component / B component = 1/1 to
In 4/1, the side-by-side type composite hollow thick and thin fibers were spun to have a hollow ratio of 5 to 30% by using the side-by-side type composite hollow spinneret shown in (a), (b) and (c) of FIG. The undrawn yarn of the fiber yarn has a residual elongation of 70 to 70 at a temperature not higher than the crystallization temperature of the undrawn yarn.
It is stretched at a ratio of 90%.

Stretching is carried out by the method described in JP-A-60-39411,
A hollow thick fiber yarn is obtained by adopting the method disclosed in JP-A-61-146836. Then, the undrawn yarn can be produced by heat-treating at a temperature not lower than the glass transition temperature and not higher than the crystallization temperature and a tension ratio of 1.001 to 1.040 times, and thereafter, the weight loss rate is 10 to 40. The horizontal groove and the vertical groove are generated by performing the alkali reduction treatment of 10%.

Since the undrawn part and the drawn part are mixed in the thick and thin fiber, the high elongation part and the low elongation part are mixed in the longitudinal direction of the fiber. This is a major cause of fluctuations in the tension in the post-process, for example, false twisting, and impairs the process stability. However, by setting the residual elongation of the drawn yarn to 70 to 90%, It is possible to absorb post-processing tension fluctuations and perform stable post-processing.

The hollowness of the fiber according to the present invention is required to be 5 to 30%, and if it is less than 5%, the transverse groove has a hollow portion (1).
In addition, if it exceeds 30%, a normal hollow cross section cannot be obtained at the spinning stage, and the hollow ratio is remarkably lowered due to the cross-sectional deformation at the processing stage, so that the object of the present invention can be achieved. Can not.

The polymer ratio for laminating must be A component / B component = 1/1 to 4/1. B component is 20%
If it is less than B, the B component does not reach the hollow portion and the vertical groove (3) does not occur as shown in FIG. Further, there may be a case where fibers having a large amount of variation in the polymer ratio among the fibers and no B component are generated. In addition, compounding 50% or more of B component is
There is a large amount of dissolution loss of the component B due to the alkali reduction treatment, and it becomes difficult to maintain the fiber strength and the hollow cross section.

When the drawing temperature exceeds the crystallization temperature of the undrawn yarn, partial crystallization progresses in the undrawn yarn before the drawing is performed, resulting in a process such as thermal embrittlement single fiber breakage in the thick portion. It will cause upset.

[0019]

EXAMPLES The present invention will be specifically described below based on examples. The water absorption performance in the examples and comparative examples was evaluated by the water drop disappearance time and the Larose method.

[Water Drop Disappearing Time] A 20 cm × 20 cm test piece was sampled from a plain woven fabric using a sample raw yarn as a weft, and the test piece was attached to a metal ring having a diameter of 15 cm to obtain 20 ± 2.
Set a distance of 1 cm from a buret containing distilled water at ℃ (one that can divide 1 ml of water into 25 ± 3 drops), drop one drop of water on the test piece, and the test piece absorbs the water drop and becomes a mirror surface. The time until the reflection disappears is measured and expressed as the average of 10 measurements.

[Laroose Method] A circular sample of a plain woven fabric using a sample raw yarn as a weft on a horizontal glass filter hydrated by using a ROS-01 method for water absorption measurement manufactured by Toyobo Engineering Co., Ltd. The sample is set, a load of 480 g is applied on the sample, the amount of water absorbed by the sample through the glass filter is measured for 30 seconds, and the water absorption rate is calculated from the average value of five measurements.

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

This 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 fiber yarn.
After weaving a plain woven fabric using this composite hollow thick and thin fiber yarn as a weft, an alkali weight reduction treatment was performed 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, number, etc. of the vertical grooves.

(Example 2) The polymer ratio of Example 1 was changed to A.
Spinning was performed by changing the ratio of component / B component = 1/1, and thereafter, stretching, weaving and alkali weight reduction were carried out under the same conditions as in Example 1. Table 1 shows various water absorption performances, feelings, lengths, widths, and numbers of lateral grooves and vertical grooves of the constituent fibers of the obtained woven fabric.

Comparative Example 1 The undrawn yarn obtained in Example 1 was drawn at a preheating temperature of 85 ° C., a draw ratio of 1.011 × 2.079,
Normal elongation is performed at a heat setting temperature of 145 ° C to obtain a residual elongation of 3
A composite hollow fiber yarn having a uniform thickness of 0% without thick and thin was made, and the weaving and alkali weight reduction treatment were performed in the same manner as in Example 1 using this yarn. 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 the example was used, and the spinning temperature was 285 using a spinneret having 30 circular spinneret holes each having a hole diameter of 0.25 mm.
Spinning at ℃, winding speed 1800m / min, fineness 155d /
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.

[0027]

[Table 1]

[0028]

EFFECTS OF THE INVENTION The latent water-absorbent polyester composite hollow thick fiber yarn according to the present invention, which is constructed as described above, is easy to make and dye, and has excellent water-absorbing performance and water-releasing performance of absorbed water by alkali reduction treatment. It also has excellent effects such as exhibiting a soft texture.

[Brief description of drawings]

FIG. 1 is a plan view showing a spinneret hole used for producing a latent water-absorbent polyester composite hollow thick and thin fiber.

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

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

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

FIG. 5 is an enlarged perspective view of details after the alkali weight reduction processing.

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

[Explanation of symbols]

 1 Hollow part 2 Horizontal groove 3 Vertical groove A A component B B component

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI Technical display location D01F 6/92 308 H 7199-3B D02J 1/22 Q D03D 15/00 A 7199-3B D06M 11/38

Claims (5)

[Claims] 1. A polyester (component A) containing 95% by weight or more of polyethylene terephthalate, and 5 parts of component A
Modified polyester (B
Ingredients) and the polymer ratio A component /
B component = 1/1 to 4/1, a side-by-side type composite hollow thick and thin fiber yarn having a hollow ratio of 5 to 30%, and self-heated elongation in the longitudinal direction of each fiber constituting the yarn and between each fiber. There are random thick parts with heat-shrinking properties and details with heat shrinkability, and there are many lateral grooves that extend in the direction perpendicular to the fiber axis and reach the hollow part of the fiber on the A component side of the thick part due to alkali weight loss. In addition, the latent water-absorbent polyester composite hollow thick fiber yarn is characterized in that there is a longitudinal groove that extends in the fiber axis direction and reaches the hollow portion of the fiber on the B component side of the thick portion. 2. The width of the lateral groove generated on the A component side of the thick portion is 70% or less of the outer circumference of the fiber, the width is 1 μm or less, and the number is 2 to 5 per 10 μm in the fiber axial direction. The latent water-absorbent polyester composite hollow thick and thin fiber yarn according to claim 1, wherein the length of the vertical groove existing on the side is 100 μm or less. 3. The component B comprises ethylene terephthalate as a main constituent unit, a dicarboxylic acid component of 5-sodium sulfoisophthalic acid component of 1.5 to 3.5 mol%,
3. The latent water-absorbent polyester composite hollow thick and thin fiber yarn according to claim 1 or 2, which is a modified polyester comprising a polyester copolymer obtained by copolymerizing 2 to 7 mol% of adipic acid component. 4. A polyester (A component) containing 95% by weight or more of polyethylene terephthalate, and 5 of A component.
Modified polyester (B
Component) and a laminated polymer ratio A component / B component = 1/1 to 4/1 using a side-by-side type composite hollow spinneret to achieve a hollow ratio of 5 to 30%. The undrawn yarn of the fine fiber yarn is drawn at a temperature not higher 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 glass of the undrawn yarn is drawn. A method for producing a latent water-absorbent polyester composite hollow thick fiber yarn, which comprises heat-treating at a temperature not lower than a transition temperature and not higher than a crystallization temperature and a tension ratio of 1.001 to 1.040. 5. A B-component comprising ethylene terephthalate as a main constituent unit and a dicarboxylic acid component of 5-sodium sulfoisophthalic acid component of 1.5 to 3.5 mol.
%, And a modified polyester comprising a polyester copolymer obtained by copolymerizing 2 to 7 mol% of the adipic acid component, the method for producing a latent water-absorbent polyester composite hollow thick and thin fiber yarn according to claim 4.