JPS5876515A - Spinneret for modified cross section yarn - Google Patents

Abstract

PURPOSE:A spinneret for modified cross section yarn in which the periphery of an extrusion nozzles is thin toward the center and becomes thicker toward the periphery at the nozzle projection end, thus producing good-quality modified cross section yarns with no uneven in yarn thickness and high dimension accuracy. CONSTITUTION:For example, the top end of cross-shaped extrusion nozzle 6 is projected more than the bottom surface of the spinneret 5 and the thickness of the nozzle periphery 7 is made to be thin toward the center and become gradually thicker toward the periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a spinneret for irregularly shaped yarn.

The stock solution discharged from the discharge hole with the protruding tip does not wet and spread at least beyond the area of the tip of the protruding tip. Therefore, the stock solution 2 discharged from the discharge hole 1 whose tip does not protrude as shown in FIG. 1 and the discharge hole 1' whose tip protrudes as shown in FIG. There are differences in form, and the discharged stock solution 2 has a smaller end area of the protruding tip, which results in a thread with less uneven thickness.

For this reason, a spinneret having a discharge hole 1' tube with a protruding tip is widely used to improve the uneven thickness of yarn.

However, among the irregularly shaped discharge holes, especially those shown in Fig. 3a,
b, c An irregularly shaped discharge hole 3a as shown in K.

The yarn spun from jb and 3c is shown in Figure 4a.

As shown in b and cK, the yarns are irregularly shaped yarns 4a, 4b and 4c with rounded central portions and no etch.

This is because the stock solution 2 tends to have a circular cross section the moment it is discharged from the discharge holes 3a, 3b, and 3c.

For this reason, as shown in FIG. 5, the protruding irregularly shaped hole 3aI
Attempts have been made to form the irregularly shaped hole 3a' so as to minimize the area of the tip of the tip. However, even if this method improves the unevenness of the thread thickness, it is not possible to obtain a thread similar to the irregularly shaped hole 3a', and the center part is rounded as shown in Fig. 4aK. The result was irregularly shaped thread 4a. This is because the thickness around the opening of the irregularly shaped hole 3a/ is uniform.
This is because the discharged stock solution is spun while being wetted and spread in the same amount in the central part and the outer peripheral part. .

The present invention has been made in order to solve such problems, and it is possible to spin a high-quality irregular-shaped yarn with high dimensional accuracy of irregular-shaped holes and similar shapes, as well as no unevenness in the thickness of the yarn. This is a duck that aims to provide spinnerets for yarn spinning.

An example of the spinneret for irregularly shaped yarn according to the present invention is shown below in Fig. 6a.
, b, 5 is a spinneret for irregularly shaped yarn, and the tip of the cross-shaped discharge hole 6 protrudes from the lower surface of the tip of the spinneret 5. The wall thickness around the opening 7 is thinner near the center and gradually thickens toward the outer periphery.

In addition, although the discharge hole 6 of the irregularly shaped yarn spinning nozzle 5 in the above embodiment is cross-shaped, in the case of a discharge hole having a shape of 1, a Y-shape, a radial shape, etc., the opening on the tip surface of the discharge hole protrudes in the same way. The surrounding wall thickness is thinner near the center and gradually thickens toward the outer periphery.

The irregular shaped yarn spinning spinneret 5 of the present invention configured as described above has the following features:
The thickness of the opening periphery 7 on the tip surface of the protruding cross-shaped discharge hole 6 is thin near the center and gradually thickens toward the outer periphery, so that when the stock solution is discharged, the opening periphery 1 on the tip surface 1! 1
There is little wetting of the undiluted solution near the center of 7, and the wetting of the undiluted solution gradually increases toward the outer periphery! This is because the stock solution does not wet and spread near the center. Therefore, when the yarn is spun from the discharge hole 6, there is no central KJl heave, and the yarn has a uniform cross-sectional shape similar to the cross-sectional shape of the etched discharge hole 6, with no unevenness in thickness.

As can be seen from the above description, according to the spinneret for irregularly shaped yarn of the present invention, it is possible to easily spin irregularly shaped yarn of good quality with high dimensional accuracy and a similar shape to the irregularly shaped discharge hole without the thickness of the yarn. This has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a discharge hole in a spinneret whose tip end does not protrude, FIG. Figure 3a
, b, and c are diagrams showing irregularly shaped discharge holes, and Figures 4a, b, and c are diagrams showing the cross-sectional shape of irregularly shaped yarn to be discharged and spun (from the irregularly shaped discharge holes shown) in Figure 3. , FIG. 5 is a diagram showing an irregularly shaped hole in which the tip area of the protruding tip part is reduced, and FIG. 6 is a longitudinal sectional view showing an example of the irregularly shaped hole of the irregularly shaped yarn spinning nozzle according to the present invention. It is an AA line arrow view of a figure. 5... Spinneret for irregularly shaped yarn spinning of the present invention, 6...
...Cross-shaped discharge hole, 7...... Around the opening of the discharge hole. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 (G) (b) (C) Figure 4 (Q) (b) Figure 5 Figure 6 (C) (b)

Claims (1)

[Claims] In a spinneret for irregularly shaped yarn in which the tip of the irregularly shaped discharge hole protrudes, it is known that the wall thickness around the discharge hole at the protruding tip is thinner near the center and gradually thickens toward the outer periphery. A spinneret for spinning irregularly shaped yarn.