KR930000236B1 - Plat hollow fibers and production thereof - Google Patents

Abstract

The method employing two circular hollow-shaped cross sections with hollow rate more than 25 % comprises: using spinneret (S) with orifices (Q) comprising adjacently separated four semicircular slits (J), (K), (L), (M); satisfying; 0.07<=A<= 0.12 (where A; slit width, unit; mm), 0.3<=B<=0.5 (B; inner redius of slit, mm), 0.07<=C<=<=0.12 (C; interval between upper portion and lower port; an of slit; mm) and 0.9<=D<=1.2 (D; central distance between slits; mm); and injecting cooled air folw from one side (H) of spinneret (S). The flat highly-hollowed fiber prepared by using this method features improved bulkiness, voluminous feel, thermo-retention property, light-weight as well as good luster.

Description

Flat hollow fiber and its manufacturing method

1 is an enlarged cross-sectional view of the flat hollow fiber produced by the present invention.

Figure 2 is a front view of the spinneret applied to the present invention.

3 is an enlarged view of the spinnerette of FIG.

* Explanation of symbols for main parts of the drawings

S: Spinneret Q: Spinneret

J, K, L, M: Semicircle Slit

The present invention relates to a flat hollow fiber and a method for manufacturing the same, and more particularly, to a flat hollow fiber and a method of manufacturing the hollow hollow has a large cross-sectional close contact with the side hollow.

In general, hollow fiber is characterized by excellent bulkiness, volume, warmth, and light weight, which are not obtained from other general fibers, and the method of changing the cross-sectional shape by adding additional functions to further increase the effect of hollow fiber is spreading. Since this method has conventionally used the existing spinneret as it is, only a hollow rate of 10-15% is obtained, which leads to a limitation in improving the function. Particularly, the big disadvantage of the synthetic fiber is the shiny gloss and feel. There was a disadvantage of not being able to improve.

Therefore, as another method to solve this problem, the hollow fiber having a large hollow ratio can be obtained by using a composite spinneret having a polymer and a gas in the form of Si-core, but this has a problem in that the apparatus is complicated and the equipment cost is high.

The present invention is to solve the above problems, by applying the spinneret improved to the existing polyester spinning equipment without attaching the composite spinning and machine injection device separately, and by injection spinning the direction of the cooling air flow in one side The purpose of the present invention is to provide a high hollow flat yarn having a hollow ratio of 25% or more to improve gloss and feel and to improve bulkiness, volume, warmth and lightness.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a front view of the spinneret ball improved to be suitable for manufacturing the flat hollow fiber of the present invention, a plurality of spinneret holes (Q) perforated on the surface of the spinneret (S) is adjacent to the four semi-circular slits (J) ), (K), (L), and (M), where the width of the slits is A, the inner radius is B, the distance between the slits is C, and the center distance of the slits is A, , C is 0.07-0.12mm. In this case, if A is larger than 0.12mm, the hollow ratio is reduced to less than 15%. On the contrary, if it is smaller than 0.07mm, it is difficult to clean after spinning. If C is larger than 0.12mm, the adhesion of polymer is increased. When the circular hollow is not formed and is destroyed, it is destroyed. On the contrary, when it is smaller than 0.07 mm, this part cannot endure the pressure during spinning, and the circle inside the slits may fall out, causing the spinneret (S) itself to be destroyed.

In addition, the inner radius B of the slit was 0.3-0.5 mm, but when B is smaller than 0.3 mm, the hollow ratio is significantly reduced or no hollow is formed. Due to the increase in the area under pressure during spinning, the inner circle is pulled out, which is also unsuitable because the spinneret (S) itself may be overlooked.

The center distance D between the next slits was 0.9-1.2mm, and if D is larger than 1.2mm, the flat hollow with two hollows is not formed. Not only is the rate decreased, but the flatness was significantly reduced, so that the flatness, the shine, and the touch could not be improved, and when the cooling air flow direction of FIG. 2 was unilateral (I), the size of the two circular hollows was not uniform. Because the irregularity is formed and the hollow ratio is significantly reduced, when the direction of the cooling air is injected from the one side (H) direction, the hollow hollow spun yarn of 25% or more can be obtained.

The present invention as described above can be obtained by applying the improved spinneret of the present invention to the existing polyester spinning device without a separate equipment, it is possible to obtain the aerial coarse yarn, weaving, knitted fabrics using a high hollow yarn plain yarn The air layer occupies the actual volume of the unit, so it can be used as a lightweight material using light features such as heat-insulating material and sports clothing, or as an insulating material due to the air layer. It is a very useful invention that can be.

[Examples and Comparative Examples]

As the fiber-forming polymer used in the experiment, an polyester having an intrinsic viscosity of 0.635 at 35 ° C. in osochlorophenol was used as a polyester polymer prepared by a conventional method.

The spinning conditions were melt-extruded at 285 ° C., the discharge amount was 30 g per minute, and the winding speed was 1200 m per minute. After the stretching was performed at a draw ratio of 3.0, 75 denier multifilaments were prepared. The odd number of spinnerets was 12 holes.

Table 1 shows the results of Examples and Comparative Examples.

Example 1

The slitting width of the spinneret was 0.09 mm, the slitting inner radius was 0.4 mm, the interval between the semicircle slits was 0.08 mm, the center distance between slits was 1.10 mm, and the land length was 0.3 mm.

Comparative Example 1

The slotting width of the spinneret was 0.13 mm, the slitting inner radius was 0.4 mm, the interval between the semicircle slits was 0.08 mm, the center distance between the slits was 1.10 mm, and the land length was 0.3 mm.

Comparative Example 2

Slit width of spinneret was 0.09 mm, inner diameter of slits was 0.55 mm, spacing between semicircle slits was 0.08 mm, center distance between slits was 1.15 mm, and land length was 0.3 mm.

Comparative Example 3

Slit width of spinneret was 0.09 mm, inner diameter of slits was 0.4 mm, gap between semicircle slits was 0.13 mm, center distance between slits was 1.10 mm, and land length was 0.3 mm.

[Comparative Example 4]

Slit width of spinneret was 0.09 mm, inner diameter of slits was 0.4 mm, gap between semicircle slits was 0.06 mm, center distance between slits was 1.10 mm, and land length was 0.3 mm.

[Comparative Example 5]

The slotting width of the spinneret was 0.09 mm, the slitting inner radius was 0.4 mm, the interval between the semicircle slits was 0.08 mm, the center distance between slits was 1.25 mm, and the land length was 0.3 mm.

TABLE 1

1. Fixed: Very good-◎, Good- ○, Normal- △, Bad- ×

2. Formula for calculating the void ratio: (internal hollow area / total area of the filament section) × 100

3. Formula for calculating flatness: filament one-way length (m in Fig. 1) /

Filament One Side Average Length (n in Fig. 1)

Claims (4)

The flat hollow fiber is characterized in that the cross-sectional structure of the two hollow hollow form and the hollow ratio is more than 25%. In manufacturing the flat hollow fiber according to claim 1, the spinneret hole Q drilled on the surface of the spinneret S has four semicircle slits J, K, L, and M) The manufacturing method of flat hollow fiber, characterized in that consisting of. The spinneret ball (S) of claim 2 has the following condition 0.07 A 0.12 (A-slit width, in mm), 0.3 B .5 (B-slit inner radius in mm), 0.07 C 0.12 (C-slit top and bottom intervals in mm) 0.9 D The manufacturing method of the flat hollow fiber characterized in that the manufacturing satisfies 1.2 (center distance between the D-slit, the unit is mm). The method for manufacturing a flat hollow yarn according to claim 2, wherein the cooling airflow is produced by injecting the cooling airflow in the one side (H) direction of the spinneret (S).