JPS60246809A - Spinneret - Google Patents

Abstract

PURPOSE:Pairs of depressions and projections are formed on both sides of the spinning nozzle of a long and narrow slit on the center in the direction crossing at right angle with the slit to enable the extrusion of a film yarn of uniform thickness all over the width. CONSTITUTION:Pairs of projections 9 and depressions 10 are formed on both sides of the spinning nozzle 1 in the direction crossing the slit at the right angle to enfroce both edges of the slit nozzle by allowing the depressions and projections to work just like ribs, when the slit nozzle is bored on the bottom of the spinneret, especially with a reamer to form through-hole 7. Thus, the open edge at the center of the nozzle 7 does not turn to form the slit of a uniform width from one end to the other and the yarn extruded out of the slit results in a uniform thickness all over the width.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a spinneret, and particularly relates to an improvement of a spinneret for wet spinning having a thin and long slit-like spinning hole in plan view.

(Prior art) When making a film-like yarn by the M-type spinning method, the width is generally 0.05 to 0.1 mm as shown in FIGS. 3a and 3b.

A spinneret 2 having a slit-shaped spinning hole 1 with a length of 10 to 50 mm and a depth of 0.05 to 0.1 mm is used.

(Problems to be Solved by the Invention) However, as shown in FIG. 4, the film-like yarn 3 wet-spun using the spinneret 2 having the slit-like spinning holes 1 has arcuate depressions on both sides and a central part. becomes noticeably thinner.

This is due to the method of forming the spinning holes 1 of the spinneret 2. That is, to form the spinning hole 1, a V-shaped slit-shaped introduction hole 5 is punched in the center of the dish-shaped spinneret plate 4 as shown in FIG. The bulge 6 protruding from the outer surface of the bottom of the hole 5 is polished to make it flat as shown in FIG. After that, the burr 8 on the tip edge of the discharge hole 7 is removed by polishing to form the spinning hole 1 as shown in FIG. 5d. 7, the width of the discharge hole 7 is narrow and the length is long, so the material on the edge of the opening at the center of the discharge hole 7 returns due to elasticity, and the center of the discharge hole 7 becomes narrower. Spun film-like yarn 3
However, as shown in Fig. 4, both sides are concave in an arc shape, and the central part is extremely thin.

(Object of the invention) The present invention has been made to solve such problems,
It is an object of the present invention to provide a spinneret capable of spinning a film-like yarn having a uniform thickness over the entire width.

Various embodiments of the spinneret according to the present invention will be described below.

(Example) First of all, the spinneret 2' shown in FIGS. The hole 1 consists of an introduction hole 5 in the form of a square slit and a straight slit-like discharge hole 7 bored through the bottom of the introduction hole 5. Reference numeral 9 denotes a pair of convex portions provided on both sides of the approximately central portion of the spinning hole 1 in a direction perpendicular to the spinning hole 1. The convex portions 9 extend toward the dish-shaped spinneret plate 40 in the radial direction. It is made into a flat band shape.

Next, to explain the details of the spinneret 2''L shown in FIGS. Two fibers are provided on both sides of the center portion in pairs in a direction perpendicular to the spinning hole 1.

Note that the convex portions 9. on the spinnerets 2', 2'' of the above embodiments.
The four parts 10 are planar band-shaped, but may have any shape as long as they are oriented in a direction perpendicular to the spinning hole 1.

(Function) As shown in each of the above embodiments, the spinneret of the present invention is provided with convex portions 9 and four portions 10 on both sides of the approximately central portion of the spinning hole 1, forming a pair in a direction perpendicular to the spinning hole 1. Therefore, when drilling the spinning hole 1, especially when drilling the discharge hole 7 through the reamer at the bottom of the introduction hole 5, the protrusion 9 and the recess 10 reinforce both sides of the discharge hole 7. It is supposed to act as a rib to
The material on the edge of the opening in the center of the discharge hole 7 does not return.
The opening width of the discharge hole 7 is uniform over the entire length. Therefore, the film-like yarn discharged and spun from such a discharge hole 7 has a uniform thickness over its entire width.

(Effects of the Invention) As can be seen from the above description, the spinneret of the present invention can spin a film-like yarn with a uniform thickness over the entire width of the lever. It can be said that it is temporary.

[Brief explanation of drawings]

1A and 1B are a plan view and a vertical sectional view showing one embodiment of the spinneret of the present invention, and FIGS. 2A and 2B are a plan view and a longitudinal sectional view showing another embodiment of the spinneret of the present invention. , FIGS. 3a and 3b are a plan view and a vertical sectional view showing a conventional spinneret having a slit-like spinning hole, FIG. 4 is a perspective view showing a film-like yarn spun by the spinneret, and FIG. Figures a to d are enlarged longitudinal cross-sectional views showing steps of a method for forming spinning holes in the spinneret of Figure 1; 11j Gandai Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a spinneret having a spinning hole in the form of a long slit with a narrow planar shape, a pair of concave portions or convex portions are provided on both sides of the approximately central portion of the spinning hole in a direction perpendicular to the spinning hole. Characteristic spinnerets.