JPH0138569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a spinneret, and particularly to an improvement in a method for forming spinning holes.

Conventionally, in a method for manufacturing a spinneret, in order to drill a spinning hole, a thin plate 2 for the spinneret is fixed on a base 1 as shown in FIG.
A blind polymer introduction hole 4 is punched using the first punch tool 3, and then a blind polymer discharge hole 6 is punched at the bottom of the polymer introduction hole 4 using the second punch tool 5, as shown in FIG. 1b. Then, the protrusion 7 protruding from the bottom of the polymer discharge hole 6 was removed by grinding and polishing as shown in FIG. There is.

By the way, when blind polymer introduction holes 4 are bored in the spinneret thin plate 2 made of austenitic stainless steel among various materials, the inner wall surface of the polymer introduction holes 4 is approximately 1000 to 2000. 4a had a rough surface with no luster, and the flow of the polymer during spinning was not smooth, and there was a problem that spinning was not possible through all the spinning holes 8 unless the spinning pressure was increased more than necessary.

The reason why the inner wall surface 4a of the polymer introduction hole 4 becomes a rough surface as described above is because the first punch tool 3 and the stainless steel thin plate 2 for the spinneret are formed during punching of the polymer introduction hole 4, as shown in FIG. 2a. A seizure phenomenon occurs between the two, and the stainless steel component 2a adheres to the tip 3a of the first punch tool 3, and as shown in FIG. This is because the inner wall surface 4a of the polymer introduction hole 4 is scraped.

For this reason, conventionally, the tip 3a of the first punch tool 3
In order to prevent seizure, lubricating oil 9 was applied to the upper surface of the spinneret thin plate 2 made of stainless steel as shown in FIG. As soon as the punching starts, the lubricating oil 9 between the first punching tool 3 and the spinneret thin plate 2 runs out as shown in the figure, and after passing through the state shown in FIG. 3b, as shown in FIG. 3c, near the end of the punching, the first
The lubricating oil 9 between the punch tool 3 and the spinneret thin plate 2 was completely absent, and the lubricating oil 9 was ineffective in preventing seizure.

The present invention has been made in view of the above circumstances, and provides a method for manufacturing a spinneret having a spinning hole consisting of a polymer introduction hole and a polymer discharge hole with mirror-glossy inner walls, in which the punch tool does not stick to the spinneret thin plate. We aim to provide the following.

The method for producing a spinneret according to the present invention includes coating a thin film of a lubricating metal such as Cu, Ag, or Au, or a metal compound thereof, or a polymer compound such as polyester or polypropylene with a thickness of 0.05 to 5 μm on the upper surface of a thin plate for a spinneret. The thin plate for the spinneret is then fixed on the upper surface of the base, and then a spinning hole consisting of a large number of tapered parts and straight parts is punched in the thin plate for the spinneret by first and second punching processes. , the thin film is peeled off and removed from the spinneret thin plate using chemicals.

In the method for producing a spinneret of the present invention, the reason why the spinning holes are formed after the upper surface of the thin plate for the spinneret is coated with a thin film of a lubricating metal, its metal compound, or a polymer compound is as follows: This is to prevent the tips of the first and second punch tools from coming into direct contact with the thin plate for the spinneret until the spinning holes have been formed in the thin plate for the spinneret.

In addition, the reason why the thickness of the thin film is preferably 0.05 to 5μ is as follows.
If it is less than 0.05μ, the thin film will break when drilling the spinning hole, and the tip of the punch tool will touch the inner wall surface of the polymer introduction hole when the spinning hole is finished, causing seizure. This is because if the thickness is exceeded, the thin film will be embedded in the inner wall surface of the spinning hole when the spinning hole is drilled, and if the thin film is peeled off and removed with a chemical or the like after punching, the inner wall surface will become an extremely rough surface with unevenness.

An embodiment 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.
A thin film 10 of Cu, which is a lubricating metal, of 0.5 μm is coated on the top surface of the thin plate 2 for the spinneret, and then the thin plate 2 for the spinneret is fixed on the top surface of the base 1 as shown in FIG. 4b. Then, as shown in FIG. 4c, a blind polymer introduction hole 4 is punched in the spinneret thin plate 2 through the thin film 10 using the first punch tool 3. During the drilling of the polymer introduction hole 4, the thin film 10 stretches along the tip 3a of the first punch tool 3, and as shown in FIG.
0 exists so as to wrap around the tip 3a of the first punch tool 3, and the tip 3a of the first punch tool 3 does not come into direct contact with the inner wall surface 4a of the polymer introduction hole 4, so that the tip 3a is different from the conventional one. Since the thin plate 2 for the spinneret is not burned as shown in FIG.

Next, as shown in FIG. 4e, a blind polymer discharge hole 6 is punched at the bottom of the polymer introduction hole 4 using the second punch tool 5. At this time as well, the thin film 10 described above extends along the tip 5a of the second punch tool 5, so as to wrap around the tip 5a of the second punch tool 5 even after the polymer discharge hole 6 has been formed as shown in the figure. The tip 5a of the second punch tool 5 does not come into direct contact with the inner wall surface 6a of the polymer discharge hole 6, and therefore the tip 5a does not seize the thin plate 2 for the spinneret. Will not stick.

Next, the protrusion 7 protruding from the lower surface of the bottom of the polymer discharge hole 6 is removed by grinding and polishing as shown in FIG. 4f, and the bottom of the polymer discharge hole 6 is penetrated to form a spinning hole 8.

After forming a large number of spinning holes 8 in the spinneret thin plate 2 in this way, for example, the Cu thin film of 0.5 mm has a thickness of 62%.
The thin film 10 is peeled off with a chemical or the like, such as by immersion in concentrated nitric acid for 10 minutes, to obtain a spinneret 11 having a spinning hole 8 with a specular inner wall surface as shown in FIG. 4g.

In the examples, after drilling the spinning holes, the lubricating thin film was peeled off using chemicals, but this is not limited to this, and peeling and removal may not necessarily be necessary, such as in the case of thin films of polymer compounds. It's good.

As can be seen from the above explanation, according to the spinneret manufacturing method of the present invention, the punch tool does not burn into the thin plate for the spinneret during the first and second punching of the spinning hole, and the inner wall surface of the mirror-like luster is maintained. An excellent effect is that a spinneret having a spinning hole consisting of a polymer introduction hole and a polymer discharge hole can be manufactured.

[Brief explanation of drawings]

Figures 1a, b, and c are cross-sectional views of main parts showing an outline of the steps in a conventional spinneret manufacturing method, and Figures 2a, b are sectional views of the polymer introduction hole drilled in the spinneret manufacturing method shown in Figure 1. Main part cross section showing defects during installation, Figure 3a,
FIGS. 4b and 4c are cross-sectional views of main parts showing the outline of steps of another conventional method for manufacturing a spinneret, and FIGS. 4a to 4g are cross-sectional views of main parts showing steps of a method of manufacturing a spinneret according to the present invention. DESCRIPTION OF SYMBOLS 1... Base, 2... Thin plate for spinneret, 3... First punch tool, 3a... Tip, 4... Polymer introduction hole, 4a... Inner wall surface, 5... Second punch tool, 5a ... Tip part, 6 ... Polymer discharge hole, 6
a...Inner wall surface, 7...Protrusion, 8...Spinning hole, 9...
...Lubricating oil, 10... Thin film, 11... Spinneret obtained by the production method of the present invention.

Claims (1)

[Claims] 1 Thickness of the lubricating metal, its metal compound, or polymer compound on the upper surface of the thin plate for the spinneret
A thin film of 0.05-5μ is coated, then this spinneret thin plate is fixed on the top surface of the base, and then the first and second
A method for manufacturing a spinneret, which comprises punching a large number of spinning holes consisting of a tapered part and a straight part in a thin plate for a spinneret, and then peeling and removing the thin film from the thin plate for a spinneret using a chemical. .