JPH022965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a spinneret in which the cross section of the dope solution discharge hole at the tip of the spinning hole is irregularly shaped, and the dope solution discharge hole extends in at least two directions centering on the intersection of the joint parts. The present invention relates to an improvement in a method for manufacturing a spinneret comprising discharge holes.

Conventionally, when the stock solution discharge hole at the tip of the spinning hole of a spinneret is an irregularly shaped stock solution discharge hole 1 as shown in FIG. One possible method is to set it up.

However, with this method, the stock solution discharge hole 1
There is a limit to the length of the so-called capillary, and when the width of one side of the partial discharge hole 1a is about 0.05 mm and the length is about 0.5 mm, the punch tool itself becomes very weak and easily breaks, so the capillary length is 0.1 mm. If the diameter exceeds mm, processing becomes extremely difficult and impossible for industrial production. Furthermore, since the capillary length is as short as 0.1 mm or less, not only the service life of the raw solution discharge hole 1 is shortened due to wear, but also the yarn thickness becomes uneven, resulting in poor quality as a spinneret.
For this reason, for example, after melt-machining an approximate discharge hole smaller than a predetermined size using the electric discharge machining method (or laser beam method), this melt-processed surface is removed with a punch tool, and then the approximate discharge hole is formed little by little. A method is adopted in which finishing is performed using a large punch tool to obtain a stock solution discharge hole 1 with a mirror surface and a predetermined size.

There is a limit to the capillary length that can be obtained when an approximate discharge hole is melt-processed using this electric discharge machining method (or laser beam method), but as mentioned above, the width of one side of the partial discharge hole 1a is 0.05 mm, and the length is 0.5 mm. In the case of about mm, the capillary length can be processed up to about 1 mm, and there is no unevenness in the thickness of the yarn during spinning.

By removing the irregularities on the melt-processed surface to make it mirror-like, it may obstruct the flow of the spinning solution, cause the spinning solution to adhere, or damage the spun yarn, reducing its strength and causing color unevenness during dyeing. This solves the problem that occurs. In addition, by gradually enlarging the approximate discharge hole obtained by the electrical discharge machining method using the plastic working method, the amount of machining per punch tool is reduced, and the resulting wall surface of the stock solution discharge hole 1 is not torn or scratched. No uneven parts such as these are generated.

However, even with this manufacturing method, there are the following problems. For example, as shown in FIG. 2, when the shape of the stock solution discharge holes 1' is such that they intersect at an acute angle at the intersection point P, especially when the acute angle is 90 degrees or less, the yarn discharged and spun from the stock solution discharge holes 1' will be As shown in FIG. 3, the cross-sectional shape is not sharp, and the outer surface of the intersection is a curved thread 2.

This is because when manufacturing a punch tool to finish the stock solution discharge hole 1', the forming tool used to form a tool with an acute angle of 90 degrees or less, for example 30 degrees, is worn out considerably, so the originally acute angle part becomes curved. Therefore, the yarn discharged and spun from the stock solution discharge hole 1' obtained by punching with such a punch tool naturally has no sharp parts, and the outer surface of the intersection part is a curved surface. .

To explain this in more detail, since the punch tool is made of a relatively strong and hard material such as tool steel such as SKH, in order to shape it into a punch tool of the specified dimensions, a diamond-containing shaping tool is required. However, if you want to obtain a punch tool with an acute angle of 30 degrees, for example, the shaping tool itself needs to be shaped at 30 degrees, and because of this, the tip of the shaping tool has almost no strength. When shaping the punch tool, the wear is significant, and the resulting punch tool is a punch tool 4 with an acute corner 3 having a curved surface, as shown in FIG. The yarn discharged and spun from the stock solution discharge hole 1' shown in FIG. 2 had no sharpness as shown in FIG. 3, and the outer surface of the intersection was curved.

The present invention has been made in order to solve this problem, and provides a stock solution discharge hole in which the cross section is irregularly shaped and the crisscross angle at which the joint partial discharge holes intersect, which extend in at least two directions centering on the intersection point, is an acute angle. The object of the present invention is to provide a method for manufacturing a spinneret in which the acute corners of the spinneret can be made sharp.

Examples of the method for manufacturing a spinneret according to the present invention will be described below with reference to the drawings. As shown in FIG. 6, it has a stock solution discharge hole 1'' which has an irregular cross section and is made up of joint partial discharge holes 1a extending in at least two directions, in this example four directions, with the intersection point P as the center, as shown in FIG. In manufacturing a spinneret 6 having a large number of spinning holes 5, a blind stock solution introduction hole 8 is bored in the spinneret plate 7 with a drill 9, as shown in FIG. As shown in FIG. b, an approximate discharge hole 10 smaller than the stock solution introduction hole 8, that is, a small discharge hole 10 having a shape similar to the stock solution discharge hole 1'' is previously punched with a punch tool 11, and then the approximate discharge hole 10 is opened as the seventh approximate discharge hole 10. As shown in Figure c, when finishing the stock solution discharge hole 1'' having a mirror wall of a predetermined size by slightly enlarging it by a plastic working method using punch tools 12a, 12b, 12c...
As shown in FIG. 8, after one of the joint partial discharge holes 1a is slightly enlarged and finished to a predetermined size, each partial discharge hole 1a is sequentially enlarged slightly and finished to a predetermined size, or As shown in the figure, the joint partial discharge holes 1a are alternately enlarged slightly to a predetermined size.

In this way, in the method for manufacturing a spinneret of the present invention,
When obtaining a stock solution discharge hole 1'' having a specular wall of a predetermined size, one of the combined partial discharge holes 1a is slightly enlarged to the specified size, and then each partial discharge hole 1a is sequentially enlarged slightly. Either the stock solution discharge hole 1'' is obtained by finishing the stock solution discharge hole 1'' to a predetermined size, or the stock solution discharge hole 1'' is obtained by enlarging each joint partial discharge hole 1a alternately and slightly to a predetermined size. The acute angles of the crisscrossing angles of the respective partial discharge holes 1a of the hole 1'' form sharp edges.

In addition, in the method for manufacturing a spinneret of the present invention, each partial discharge hole 1a is slightly enlarged to a predetermined size without using a punch tool having the same shape as the stock solution discharge hole 1''. The punch tool only needs to have an extremely simple slit shape, so
This is easy to manufacture and can have high dimensional accuracy.

The above embodiment is an example in which a spinneret having an elongated X-shaped stock solution discharge hole was manufactured, but the spinneret is not limited to this. Similarly, in the case of a stock solution discharge hole of a shape, a shape of a ten, etc., the acute angles of the crisscrossing angles of the respective partial discharge holes can be made into sharp edges.

As detailed above, according to the method for producing a spinneret of the present invention, the raw solution is discharged in which the cross section is irregularly shaped and the angle at which the joint partial discharge holes intersect, which extend in at least two directions centering on the intersection point, is an acute angle. An excellent effect is that the mirror corner of the hole can be formed into a sharp edge, and a spinneret that can discharge and spin a sharp yarn having approximately the same cross-sectional shape as the stock solution discharge hole can be obtained. In addition, after drilling a discharge hole with a shape similar to that of the stock solution discharge hole, each partial discharge hole is enlarged little by little to finish it to the specified dimensions, so the punch tool used for this has an extremely simple structure, so it is easy to manufacture. It is easy to obtain a product with high dimensional accuracy, and therefore, in the method for manufacturing a spinneret, it is possible to obtain a stock solution discharge hole with high dimensional accuracy, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of an irregularly shaped stock solution discharge hole;
Figure 2 is a diagram showing the elongated X-shaped stock solution discharge hole, Figure 3
The figure shows the cross-sectional shape of the yarn discharged and spun from the raw solution discharge hole in Figure 2, Figure 4 shows the cross-sectional shape of the punch tool for finishing the raw solution discharge hole in Figure 2, and Figure 5
The figure is a diagram showing an example of a dope discharge hole in a spinneret manufactured by the manufacturing method of the present invention, and FIG. Figures 7a, b, and c are diagrams showing the process of forming a stock solution discharge hole in the method for manufacturing a spinneret of the present invention, and Figures 8 and 9 are views showing the process of forming a stock solution discharge hole in the drilling process. It is a figure which shows a finishing order. 1″……Standard solution discharge hole, 1a……Partial discharge hole, 5
...Spinning hole, 6... Spinneret, 7... Spinneret plate, 8... Stock solution introduction hole, 9... Drill, 10...
Approximate discharge hole, 11... Punch tool, 12a, 12
b, 12c...Punch tool.

Claims (1)

[Claims] 1. In manufacturing a spinneret with a large number of spinning holes having a stock solution discharge hole that has an irregular cross section and is composed of joint partial discharge holes extending in at least two directions around an intersection point, the spinneret plate is blind. An approximate discharge hole smaller than the concentrate discharge hole is drilled in advance at the bottom of the stock solution introduction hole, and then the approximate discharge hole is enlarged little by little by a plastic working method to form a stock solution discharger having a specular wall of a predetermined size. When finishing the hole, either one of the joint partial discharge holes is slightly enlarged to a predetermined size, and then each partial discharge hole is sequentially enlarged to a predetermined size, or each joint part is finished to a predetermined size. A method for manufacturing a spinneret, characterized in that the discharge holes are alternately enlarged slightly to obtain a predetermined size.