KR20010028164A - Sinneret for hollow fiber having high hollowness - Google Patents

Abstract

PURPOSE: Provided is a spinning nozzle of a hollow yarn having high hollow ratio and regular cross-section. CONSTITUTION: The spinning nozzle is comprised of at least one slit. Projecting parts are formed on position been closed by both ends of the slit. The projecting parts are projecting shape in the inner direction and are communicated with the slit. Width(W) of the slit is 0.06-0.12mm. The projecting part is on 1-4times of distance(L) from both ends than the width(W) of the slit. Height(H) of the projecting part is 0.5-2times of the width(W).

Description

Sineneret for hollow fiber having high hollowness

The present invention relates to a spinneret for manufacturing hollow fiber having a high hollow ratio, and more particularly, to a spinneret for manufacturing hollow fiber having a hollow ratio of 20 or more and a cross-sectional shape of an inner hollow part.

As a conventional method for manufacturing high hollow fiber hollow fiber, there is a method of increasing the hole diameter of spinnerets for manufacturing hollow fiber. It is possible to manufacture high hollow fiber hollow fiber by mechanically increasing spinneret slits to increase the hollow ratio.

However, the hollow yarns produced by the method of increasing the hole diameter of the spinneret have a disadvantage in that the hollow fiber cross section is broken during the spinning and the trimming is frequent, so that the spinning processability is bad.

In addition, the conventional spinnerets for manufacturing hollow fiber are composed of three (see Fig. 4) to four slits so that the cross-sectional shape of the inner hollow portion of the hollow yarns spun according to the number of slits during spinning can be seen from the cross-sectional photograph of FIG. As can be seen in the form of a triangular or square, not a round.

When the inner hollow part of the hollow yarn has a cross-sectional shape such as a triangle or a quadrangle, a difference in thickness of the hollow part occurs, and thus, there is a problem in that the dyeing difference appears partially during dyeing. In addition, the angular portion may be crushed or completely adhered to the hollow yarns due to heat or tension during the twisting, weaving, or weaving process during the post-processing, so that the characteristics of the hollow yarns may be lost.

In order to solve this problem, a method is known in which a pair of jaws is formed on the slit sock end of the hollow spinneret to smooth the flow of the polymer at the end of the slit. 3 is a cross-sectional view of the spinneret for manufacturing hollow fiber having a pair of jaws 20 protruding inwardly in communication with the slits at the sock end of the slits 10. The pair of jaws at the slits end are intended to increase the amount of polymer flow at the slits end. When the flow amount of the polymer at the end of the slit increases, the flow of the polymer is smoothed, and the thickness of the hollow fiber at the junction between each slit end can be solved.

Hollow yarns produced using the spinneret of FIG. 3 have improved thickness phenomena at the joints between the ends of the slits to have a uniform cross-sectional thickness as a whole.

However, the hollow yarns produced using the spinneret are non-uniform in the cross-sectional distribution along the entire hole of the hollow fiber, so that the uniformity (U) of the fiber is poor and the cross-sectional shape of the hollow yarns is still close to a square.

The hollow yarn manufactured using a hollow spinneret (FIG. 3) having a pair of jaws formed on the slit sock end is partially dyed when dyed, and is subjected to heat during twisting, weaving or weaving during the post-process. Due to the tension, the hollow part is crushed, or is still in close contact with the problem that the characteristics of the hollow yarn is lost.

Accordingly, the present invention solves the problems of the conventional spinnerets for manufacturing high hollow fiber hollow fiber, and has a spinneret capable of manufacturing hollow fiber having a higher hollow ratio and uniformly substantially round cross-sectional shape with high spinning processability. It is technical problem to provide.

1 is a cross-sectional view of the spinneret for manufacturing hollow fiber according to a preferred embodiment of the present invention.

Figure 2 is a cross-sectional photograph of a hollow yarn prepared using the spinneret of Figure 1;

Figure 3 is a cross-sectional view of the spinneret for manufacturing hollow fiber with a jaw at the end of the slit.

Figure 4 is a cross-sectional view of the spinneret for manufacturing a conventional hollow fiber.

Figure 5 is a cross-sectional photograph of a hollow yarn prepared using the spinneret of Figure 4;

Explanation of symbols on the main parts of the drawings

10: Slit 20: Slit Chin

Therefore, according to the present invention, in the hollow spinnerette of at least one slitting, a pair of jaws protruding inwardly in communication with the slits is formed at a position adjacent to the slit sock end. This is provided.

Preferably, according to the present invention, the width W of the slits is 0.06 to 0.12 mm, and the position of the jaw adjacent to the sock end is 1 to 4 times greater than the width W of the slits at the sock end. In addition, the height (H) of the jaw is provided with a spinneret for manufacturing a high-hollow hollow fiber, characterized in that about 0.5 to 2 times the width (W) of the slits.

In addition, according to the present invention there is provided a hollow yarn manufactured using the spinneret described above.

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

1 shows a preferred embodiment of the hollow spinneret according to the invention.

1 is a spinneret for manufacturing hollow fiber having a pair of jaws 20 protruding inwardly in communication with the slits at a position adjacent to the sock end of the slits 10. When the slits tucks 20 are located adjacent to both ends, the flow of the polymer is smoothed at the ends of the slits, which not only solves the thinning of the hollow fiber at the joints between the slits, but also the whole hole of the spinneret. The cross-sectional distribution of the hollow fibers manufactured in the hole is uniform, and the uniformity (U) of the fiber is improved.

FIG. 2 is a cross-sectional photograph of a hollow yarn manufactured using the spinneret of FIG. 1. As shown in Figure 2 it can be seen that the hollow fiber prepared using the spinneret of Figure 1 is a hollow fiber having a substantially round cross-sectional shape.

The spinneret for manufacturing the high-hollow hollow fiber of the present invention, the jaw adjacent to the sock end is located at a distance (L) 1 to 4 times the width (W) of the slits at the sock end, from 0.06 to 0.12 mm, and the height of the jaw ( H) is 0.25 to 2 times, more preferably 0.5 to 2 times the width (W) of the slit.

When the position L of the jaw adjacent to the sock end is less than one times the width W of the slits at the sock end, it is difficult to improve the uniformity of the hollow yarns and to form a circle in the hollow fiber inner cross-sectional shape. If the position of the jaw adjacent to the sock end is greater than four times the width W of the slit at the sock end, it is not preferable that the hollow fiber of the hollow yarn is lowered or the hollow yarn of which the inner shape is deformed is manufactured.

If the height H of the slits tuck is smaller than 0.25 times the width W of the slits, the hollow fiber having an internal cross-sectional shape cannot be obtained, and the height H of the slits tuck is the width of the slits. If it is larger than 2 times (W), the hollow fiber of the hollow fiber is reduced, or the hollow fiber whose inner cross-sectional shape is deformed is obtained.

In the spinneret of the present invention, it is preferable that the slitting jaw is arranged in the center line of the slitting jaw toward the center of the hollow part. When the center line is disposed at an angle other than the center of the hollow part, the fiber uniformity of the hollow fiber is worse and the cross-sectional shape of the hollow part is difficult to form a circle.

The end portion of the slits tuck is preferably rounded rather than angled in view of the flow of the polymer.

When the hollow fiber is manufactured using the spinneret of the present invention as described above, regardless of the number of slits, the cross-sectional shape of the inner hollow portion has a rounded shape, and the hollow portion can be deformed during post-processing, thereby solving a problem of high hollow ratio. It is possible to manufacture a hollow fiber having a uniform cross-sectional shape with a high spinning processability.

Specific features and advantages of the invention will be described through the following examples. However, the present invention is not limited to the following examples.

The physical property measurement method of the following Examples and Comparative Examples is as follows.

*

* The incidence of radiation fracture cross-section refers to the fracture cross-section incidence, which is expressed as the percentage of broken yarn in the whole hole of the spinneret. A broken yarn refers to a yarn in which a hollow section is not formed and the cross section is broken. The radiation fracture cross-section incidence was calculated using the following equation.

* Fiber uniformity was measured by U measuring machine (Unevenness).

<Examples 1 to 3>

A 100-denier (100 denier / 24 filament) hollow fiber was produced with a conventional spin draw spinner using a 24-hole spinneret of the specification as shown in Table 1 using a general polyester resin. In Table 1, W represents the width of the slits of the spinneret, H represents the height of the slits tuck, and L represents the distance from the slits end of the spinneret to the slits tuck. Physical properties and processability of the prepared hollow yarns are shown in Table 2 below.

<Comparative Examples 1 and 2>

It was prepared in the same process as in Example 1 except for having a specification of spinneret as shown in Table 1. Physical properties and processability of the prepared hollow yarns are shown in Table 2 below.

division W (mm) H (mm) L (mm) Example 1 0.10 0.10 0.10 Example 2 0.10 0.05 0.20 Example 3 0.10 0.20 0.40 Comparative Example 1 0.10 0.10 0.50 Comparative Example 2 0.10 0.10 0.05

division Hollowness () Radiation Fairness (million power ()) Radiation Fracture Occurrence Rate () Fiber leveling agent (U) Cross section of hollow part Example 1 30 95 1 to 2 1.2 circle Example 2 35 93 2-3 1.5 circle Example 3 28 93 1 to 2 1.2 circle Comparative Example 1 25 88 5 to 6 2.0 circle Comparative Example 2 30 95 1 to 2 1.2 Square

When the hollow fiber is manufactured using the spinneret of the present invention, as shown in the embodiment, the hollow fiber having a large hollow ratio and the cross-sectional shape of the hollow part as a whole can be manufactured with improved spinning processability.

Claims (3)

In the hollow spinnerette, a pair of jaws protruding inwardly in communication with the slits are formed in a position adjacent to the slit sock end of the spinneret composed of at least one slitting. The width W of the slits is 0.06 to 0.12 mm, and the position of the jaw adjacent to the sock end is at a distance L of 1 to 4 times that of the slits from the sock end. And the height H of the jaw is 0.5 to 2 times the width W of the slits. Hollow fiber manufactured using the spinneret of claim 1.