JPH0116224B2 - - Google Patents

Description

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

The stock solution discharged from the polymer 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 first
Discharge hole 1 whose tip does not protrude as shown in the figure
As shown in FIG. 2, there is a difference in the shape of the pool of the stock solution 2 discharged from the discharge hole 1' whose tip is protruding, and the discharge hole 1' has a protruding tip.
The smaller the tip area of the protruding tip, the less uneven the thickness of the yarn.

For this reason, a spinneret having a discharge hole 1' with a protruding tip is considered to be effective in improving yarn thickness unevenness, and many types of spinnerets are manufactured. The yarn discharged and spun from the conventional irregularly shaped polymer discharge hole 3a as shown in FIG. 3 becomes an irregularly shaped yarn 4a with a rounded center and no edges as shown in FIG. This is due to the unique development of the liquid, which tends to take on a circular cross-section the moment the stock solution 2 is discharged from the discharge hole 3a, and the large area of the tip of the protrusion.

By the way, in the conventional method for manufacturing a spinneret for irregularly shaped yarn, as shown in FIG.
A polymer introduction hole 7 is drilled, and then the convex portion 7a protruding from the back surface of the base plate 6 is ground and flattened as shown in FIG. 5b, and then a first polymer introduction hole is formed as shown in FIG. 5c. At the same time, a second polymer introduction hole 9 is punched at the bottom of the second polymer introduction hole 9 using an irregularly shaped second punch tool 8, and at the same time, an irregularly shaped protrusion 9a is provided on the back surface of the base plate 6. An irregularly shaped polymer discharge hole 1' is bored in the base plate 6, and the surface of the irregularly shaped protrusion 9a on the back side of the base plate 6 is finished and polished as shown in FIG. 5d. The protruding part 9a has a shape in which the central part is high and the volume is large, and the volume becomes gradually lower and smaller toward the outer periphery.The surface of the protruding part 9a is as shown in FIG. The wall thickness around the opening of the polymer discharge hole 1' is thick near the center and gradually thinner toward the outer periphery. The undiluted solution discharged from the container easily wets and spreads.

For this reason, an attempt was made to drill the polymer discharge hole 1' in such a way that the tip area of the protruding portion 9'a of the protruding irregularly shaped polymer discharge hole 1' was made as small as possible as shown in FIG. For example, as shown in FIG. 7, a base 11 having a recess 10 of a desired shape is provided at the bottom of the base plate 6, and a second polymer introduction hole 9' is punched with the second punch tool 8.
In this method, a protrusion 9'a of a desired shape is formed in the recess 1', and then a polymer discharge hole is drilled and finish polished. It is extremely difficult to align the recesses 10 of 11, and when drilling tens of thousands to hundreds of thousands of spinning holes, the positional accuracy becomes a problem, and in addition, the load during processing by the second punch tool 8 is high. may be lost.

However, even with the thus obtained irregularly shaped yarn spinning nozzle, even though the uneven thickness of the yarn is improved, it is not possible to obtain a yarn similar in shape to the irregularly shaped polymer discharge hole 1', as shown in FIG. Then, the yarn 4a became an irregularly shaped yarn with a rounded center and no edge. This is because the thickness around the opening of the irregularly shaped polymer discharge hole 1' 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 to solve this problem, and it is possible to spin irregularly shaped yarns not only to ensure that there is no unevenness in the thickness of the yarn but also to have high dimensional accuracy and good quality with similar shapes to the irregularly shaped polymer discharge holes. It is an object of the present invention to provide a method for manufacturing a spinneret for irregularly shaped yarn.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a spinneret for irregularly shaped yarn according to the present invention will be explained below with reference to the drawings.

As shown in FIG. 8a, a first polymer introduction hole 7' is punched in the base plate 6 using an irregularly shaped first punch tool 5' whose tip is wedge-shaped in two steps, and the remaining portion of the bottom surface is removed. The thickness is gradually increased from the center toward the outer periphery, and then the convex portion 7'a protruding from the back surface of the cap plate 6 is polished off and made flat as shown in FIG. 8b.
As shown in FIG. After that, an irregularly shaped polymer discharge hole is bored at the bottom of the second polymer introduction hole 9'',
The surface of the irregularly shaped protrusion 9''a on the back side of the cap plate 6 is polished as shown in FIG. 8d to reduce the wall thickness around the opening of the polymer discharge hole 1'' at the tip of the protrusion 9''a. As shown in Figure 8e, it is thin near the center and gradually thickens toward the outer periphery, that is, the area of the tip surface of the protrusion 9''a is small near the center of the polymer discharge hole 1'' and gradually increases toward the outer periphery. It is something to do.

In addition, in the manufacturing method of the irregularly shaped yarn spinning nozzle in the above embodiment, a cross-shaped polymer discharge hole 1'' is bored, but it is also possible to drill a T-shaped, Y-shaped, radial drum-shaped, etc. discharge hole. In the same way, the wall thickness around the opening on the tip surface of the protruding polymer discharge hole should be made thinner near the center.
The thickness is gradually increased toward the outer periphery.

The spinneret 10 for spinning irregularly shaped yarn manufactured as described above
The wall thickness around the opening of the tip surface of the protruding cross-shaped polymer discharge hole 9'' is thinner near the center and gradually thickens toward the outer periphery. There is little wetting of the stock solution near the center around the opening, and wetting of the stock solution gradually increases toward the outer periphery.In other words, the stock solution does not wet and spread near the center.Therefore, the polymer discharge hole 1''
The yarn discharge-spun from the yarn has no bulge in the center and has a uniform cross-sectional cross-section similar to the cross-sectional shape of the edged polymer discharge hole 1''.

As can be seen from the above explanation, according to the manufacturing method of the spinneret for irregularly shaped yarn of the present invention, irregularly shaped yarn with high dimensional accuracy and similar shape to the irregularly shaped polymer discharge hole without uneven yarn thickness can be spun. This has the excellent effect that it is possible to easily manufacture a spinneret for irregularly shaped yarn.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing a polymer discharge hole in a spinneret with no protruding tip, Figure 2 is a cross-sectional view showing a polymer discharge hole in a spinneret with a protruding tip. FIG. 4 is a diagram showing an example of an irregularly shaped polymer discharge hole, and FIG.
Figures a to d are diagrams showing the steps of an example of a conventional method for manufacturing a spinneret for irregularly shaped yarn, Figure e is a top view of Figure d, and Figure 6 is an irregularly shaped polymer discharge hole with a small area at the tip of the protrusion. FIG. 7 is a diagram showing a conventional test method for drilling the irregularly shaped polymer discharge hole of FIG. 6, and FIGS. 8a to 8d are steps of the manufacturing method of the irregularly shaped yarn spinning nozzle according to the present invention. 2. Figure e is a top view of figure d. 1''...polymer discharge hole, 5'...irregularly shaped first punch tool, 6...mouth plate, 7'...polymer introduction hole, 7'a...protrusion, 8...irregularly shaped second punch tool , 9″a... protrusion, 12... spinneret for irregularly shaped yarn spinning.

Claims (1)

[Claims] 1. In a method for manufacturing an irregularly shaped yarn spinning mouthpiece in which the tip of an irregularly shaped polymer discharge hole protrudes, a first polymer introduction hole is punched in the mouthpiece plate using an irregularly shaped first punch tool having a wedge-shaped tip. The remaining portion of the bottom part is gradually thickened from the center toward the outer periphery. Next, the protruding part on the back of the cap plate is ground to make it flat, and then a second irregularly shaped punch tool is inserted into the bottom of the first polymer introduction hole. At the same time, a second polymer introduction hole is drilled, and at the same time, an irregularly shaped protrusion is provided on the back of the cap plate, and then an irregularly shaped polymer discharge hole is bored at the bottom of the second polymer introduction hole. A method for manufacturing a spinneret for irregularly shaped yarn, characterized by finishing and polishing the surface of a shaped protrusion, and making the wall thickness around the polymer discharge hole at the tip of the protrusion thinner near the center and gradually thicker toward the outer periphery.