JPH0441703A - Production of spinneret - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for finishing the bottom of a spinning dope introduction hole of a melt spinning die.

(Prior art and its problems) In particular, the irregular shaped spinning hole of the conventional thick material spinneret, when forming the spinning hole 7 as shown in FIG. 2 by cutting and plastic working,
The bottom part 4 of the spinning dope introduction hole was finished by electric discharge machining in order to remove the sagging of the outline caused by the irregular shape, tool marks, and small particles generated during hole machining.

However, in the above finishing method, since the discharge electrode 8 having approximately the same diameter as the diameter of the spinning dope introduction hole bottom 4 is rotated uniaxially, carphones caused by discharge, non-uniformity of the electrolyte, and differences in rotation peripheral speed are used. Due to such reasons, the electrode tip does not wear out evenly,
As a result, the finished surface of the bottom 4 of the spinning dope introduction hole also became uneven, making it impossible to obtain a smooth finish.

For this reason, turbulence occurs in the spinning dope during spinning, causing denier unevenness.

(Object of the Invention) The present invention was made to solve the above problems, and provides a method for manufacturing a spinneret having a smooth spinning dope introduction bottom.

(Structure of the Invention) The technical means of the present invention for solving the above-mentioned problems is that after forming an introduction hole and a discharge hole by cutting and plastic working, finishing the bottom of the spinning stock solution introduction part by electrical discharge machining, This method is characterized by polishing while rotating and swinging the discharge electrode, which has a diameter smaller than the diameter of the bottom of the undiluted solution.

(Function) According to the method for manufacturing a spinneret of the present invention configured as described above, since the electrode has an outer diameter smaller than the diameter of the bottom of the spinning dope introduction hole, it can not only rotate but also oscillate. The resulting carbon is easily removed, the electrolyte becomes uniform, and the difference in rotational peripheral speed is eliminated, resulting in a smooth finished surface with no unevenness.

Note that the outer diameter of the electrode is preferably 50% to 70% of the diameter of the bottom of the spinning dope introduction hole from the viewpoint of the rocking effect.

(Example) Examples and conventional examples will be described below.

First, as an example, as shown in Fig. 1, the material is 5US31.
6. Drill a hole diameter of 3 m in the spinneret plate l with a plate thickness of 15 mm.
Drill an introduction hole 2 of m, and then use a punch and reamer to make T.
The width of the irregularly shaped hole is 0.1mm, and the width of the T-shape is 0.3rnm.
, after providing a discharge hole 3 with a height of 0.2 mm, a diameter of 1.5 mu
The bottom part 4 of the spinning dope introduction hole ++ is made of AgW and has an outer diameter of 11T.
LffI's electric discharge machining electrode 5 rotates at a rotation speed of 300 revolutions/minute, and the axis of rotation is oscillated with an eccentric cam of 0.5 m between centers.
Finishing was performed on the entire bottom of the spinning dope introduction hole with an electrical discharge machining time of 30 seconds per hole to obtain a melt spinning nozzle 6 having 24 holes.

On the other hand, as a conventional example, as shown in Fig. 2, the outer diameter of the electric discharge machining electrode is 1.5 mm and the number of holes is the same as in the embodiment except that it does not oscillate, and the electric discharge machining time per hole is 20 seconds. 2
Four melt spinning nozzles 9 were obtained.

However, when quality inspection was conducted on the finish of the spinning dope introduction hole bottom 4, the following results were obtained.

As is clear from the above results, in the conventional example, the smoothness is 0. While a smooth finished surface could not be obtained with O1~0.1 μm, in the example, smoothness was 0 and O~0.03.
A smooth finished surface of μm was obtained.

Further, in the results of spinning polyester, denier unevenness occurred in the spinneret 9 of the conventional example, whereas good spinning without denier unevenness was achieved with the spinneret 6 of the example.

(Effect of the invention) As described above, according to the method for manufacturing a spinneret of the present invention,
Since the electrode has an outer diameter smaller than the diameter of the spinning stock solution introduction bottom, it can not only rotate but also oscillate, so carbon due to discharge is easily removed, the electrolyte is uniform, and differences in rotational peripheral speed are resolved. Therefore, since the spinneret has a spinning dope introduction bottom with a smooth finished surface without unevenness, the spinning dope flows smoothly during spinning, and has the excellent effect of obtaining fibers with good quality such as denier. It is something.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing electric discharge machining in an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing conventional electric discharge machining. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) After forming an introduction hole and a discharge hole by cutting and plastic working, the bottom of the spinning dope introduction hole is finished by electrical discharge machining, and an electric discharge electrode having a diameter smaller than the diameter of the bottom of the spinning dope introduction hole is used. 1. A method for producing a melt spinneret, which comprises polishing while rotating and rocking the spinneret.