JPH02450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spinneret, and particularly to an improvement in a spinneret for wet spinning holes having a large number of fine spinning holes.

A wet spinning nozzle is equipped with a large number of fine spinning holes, and when the stock solution is spun from the spinning holes, there is a difference in temperature and concentration between the coagulated liquid near the center and the outer periphery of the spinning surface. As a result, the coagulation rate of the spun yarn becomes uneven and the thickness of the yarn varies.

Such a phenomenon becomes more pronounced as the density of the spinning holes becomes higher and the size of the spinneret becomes larger, and contrary to the improvement in productivity, the quality of the spun yarn deteriorates.

For this reason, especially when manufacturing a spinneret having large or extremely dense spinning holes, a so-called lane section 2 is provided where no spinning holes 1 are partially provided, as shown in FIG. 1, and this lane section 2 is When the stock solution is spun from the spinning hole 1, the temperature and concentration of the coagulated liquid near the center and around the outer periphery of the spinning surface are kept uniform to form a passage.

However, there are the following problems in the manufacturing process of a spinneret having such a structure.

That is, as shown in FIG. 2, when drilling the spinning hole 1, when punching the stock solution introduction hole 5 in the spinneret plate 4 with the punch tool 3, the protrusion that appears on the lower surface (spinning surface) of the spinneret 4. The holes are sequentially drilled while the portion 6 is restrained by the groove 8 provided in the base 7, but as the hole drilling process progresses, the spinneret plate 4 elongates, and this elongation causes the convex Since the material is concentrated near the lane portion 2 which has no portion 6 and is not restrained by the groove 8, the material at the periphery of the lane portion 2 curves upward due to this elongation, as shown in FIG. As a result, the axis of the spinning hole 1 is tilted toward the lane portion 2, and since the peripheral edge of the lane portion 2 is curved upward, the punch tool 3 enters deeper than other parts, and the punch tool 3 enters deeper than other parts. The length of the stock solution discharge hole 9 becomes shorter.

Thus, when the stock solution is spun from such a spinneret, the threads spun from the spinning holes 1 near the lane portion 2 may become stuck together, and the amount of the stock solution discharge holes may vary, resulting in uneven yarn thickness. However, it was not possible to spin yarn of good quality.

The present invention was made to solve such problems, and even though the spinning holes are large and extremely dense, there is no inclination in the axis of the spinning holes at all, and the length of the raw solution discharge hole in the spinning holes can be adjusted. The aim is to provide a uniform spinneret.

In the spinneret of the present invention, as shown in FIG. 4, a group of fine spinning holes consisting of a stock solution introduction hole 5 and a stock solution discharge hole 9 connected thereto is divided into a plurality of parts by a lane section 2', and the lane section 2' is divided into a plurality of parts. It is characterized by being composed of a blind portion in which a large number of stock solution introduction holes 5 or stock solution introduction holes 5 and continuous solution discharge holes 9 are closed with a filling material 10.

When manufacturing the spinneret of the present invention having such a structure, the stock solution introduction holes 5 are formed on the entire surface of the spinneret plate 4 as shown in FIG. Holes are sequentially drilled while the convex portions 6 that appear on the surface are restrained by grooves 8 provided in the base 7, and the elongation of the spinneret plate 4 due to the hole punching is not concentrated locally but is spread over the entire spinneret plate. dispersed,
The spinneret plate 4 is not partially bent upward. Therefore, the axis of the spinning hole 1 does not tilt toward the lane portion 2 as in the conventional case, but is vertical, and since the spinneret 4 is not partially curved upward, the punch tool 3 is partially deep. The length of the stock solution discharge hole 9 in the spinning hole 1 becomes uniform. In addition, after the spinning hole 1 is formed, the stock solution introduction hole 5 or the stock solution introduction hole 5 and the stock solution discharge hole 9 connected thereto in the lane portion 2' which is divided into a plurality of groups of spinning holes are closed with the filler 10, so that they become blind. , even when high spinning pressure is applied during wet spinning, the lane portion 2' does not deform.
It will also serve as a reinforcement.

Thus, when the stock solution is spun from such a spinneret, the spinning hole 1 near the lane section 2' is
There is no longer a phenomenon in which yarns spun together stick to each other, and there is no difference in the amount of raw solution discharged resulting in uneven thickness of the yarn, making it possible to obtain yarn of good quality.

Next, in order to clarify the effects of the spinneret according to the present invention, specific examples and conventional examples thereof will be described.

Example As shown in FIG. 4, a spinneret plate 4 made of tantalum material with a diameter of 120 mm and a thickness of 0.5 mm has an opening diameter of 450 μm,
20,000 spinning holes 1 are formed, each consisting of an inverted conical stock solution introduction hole 5 with a depth of 450 μm and a continuous solution discharge hole 9 with a diameter of 50 μm, and these 20,000 spinning holes 1 form a radial lane portion 2. ' is divided into eight spinning hole groups, and the lane part 2' is made into a flat blind shape by blocking the 400 stock solution introduction holes 5 and the continuous solution discharge holes 9 with tantalum filler 10. Base.

Conventional example: Diameter 120mm, thickness as shown in Figures 1 and 3
A spinneret plate 4 made of 0.5 mm tantalum material has 20,000 spinning holes 1 radially formed, each consisting of an inverted conical stock solution introduction hole 5 with an opening diameter of 400 μm and a depth of 450 μm, and a continuous solution discharge hole 9 with a diameter of 50 μm. A spinneret that is divided into eight spinning hole groups by a lane portion 2 that does not have any spinning holes.

However, when the stock solution was wet-spun using the spinnerets of these examples and the conventional example, in the conventional spinneret, the threads spun from the spinning hole 1 near the lane section 2 were stuck together, and there was a difference in the amount of the stock solution discharged. In contrast, there were many cases in which the thickness of the yarn was uneven, whereas in the spinneret of the example, there was no such yarn. This is because the spinneret of the present invention has a vertical axis and no upwardly curved parts.
This is because the length of the stock solution discharge hole 9 in the spinning hole 1 is uniform.

In the above example, the lane portion 2' is radial, but when the stock solution is spun out from the spinning hole 1, there is no difference in the temperature and concentration of the coagulated liquid near the center and the outer circumference of the spinning surface. The lane portion may have any shape as long as it can be kept uniform.

As can be seen from the above explanation, the spinneret of the present invention is
Even though the spinning holes are large and very densely packed, there is no inclination in the axis of the spinning hole, and the length of the solution discharge hole in the spinning hole is all uniform, so when the solution is wet-spun, the yarns will not stick together. It has the excellent effect of being able to obtain yarn of good quality without causing any stiffness, and without causing unevenness in the thickness of the yarn due to differences in the amount of stock solution discharged.

[Brief explanation of drawings]

Figure 1 is a partial longitudinal sectional view of a conventional spinneret, Figure 2
The figure is a longitudinal cross-sectional perspective view of main parts showing the state of drilling of the stock solution introduction hole in the spinning hole of the spinneret.
5 is a vertical sectional view showing a state in which a stock solution discharge hole is bored at the bottom of the stock solution introduction hole shown in FIG. 2; FIG. 4 is a partially vertical perspective view showing an example of a spinneret according to the present invention; The figure is a longitudinal sectional perspective view of a main part showing the state of drilling of the stock solution introduction hole in the spinning hole of the spinneret. 1... Spinning hole, 2'... Lane part, 3... Punch tool, 4... Spinneret plate, 5... Stock solution introduction hole,
6... Convex portion, 7... Base, 8... Concave groove, 9... Stock solution discharge hole, 10... Filler.

Claims (1)

[Claims] 1 In a spinneret having a large number of fine spinning holes consisting of a stock solution introduction hole and a stock solution discharge hole connected thereto, the spinning hole group is divided into a plurality of parts at a lane part, and the lane part has a large number of stock solution introduction holes or stock solution discharge holes. 1. A spinneret characterized by comprising a blind portion in which a raw solution discharge hole connected to the spinneret is closed with a filler material.