JPH0160329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a spinneret, and more particularly to a method for producing a spinneret for wet spinning having a large number of fine spinning holes and made of Ta.

Traditionally, yarns obtained by wet spinning include acrylic,
There are staple fibers such as rayon, and the material of the spinneret used in the wet spinning method is, for example, stainless steel in the case of acrylic, Ta or noble metal in the case of rayon.

By the way, there are various methods for forming a large number of fine spinning holes in such a spinneret material, but for example, in the case of electrical discharge machining or cutting, the walls of the resulting spinning holes are extremely rough; During spinning, the stock solution accumulates and sticks to the unevenness of the wall surface, causing problems such as uneven thickness of the spun yarn and clogging of the spinning holes.

For this reason, the spinning hole of the spinneret requires a very smooth wall surface that is close to a mirror surface, so many fine spinning holes are often punched in the spinneret material by plastic working using a punch tool.

However, even this plastic working method has its problems, and processing troubles are particularly likely to occur when the material of the spinneret is Ta. This is a phenomenon in which, as shown in FIG. 1, when the stock solution introduction holes 3 are punched in the spinneret material 1 with the punch tool 2, the tip of the punch tool 2 breaks after about 1,000 to 2,000 holes are formed. Further, even if it does not break, the wall surface of the drilled stock solution introduction hole 3 gradually becomes dull and rough.

As mentioned above, even if the tip of the punch tool 2 does not break, the wall surface of the stock solution introduction hole 3 becomes rough due to the friction generated during processing between the spinneret material 1 and the tip of the punch tool 2. The temperature is increased and the second
As shown in the figure, the Ta of the spinneret material 1 is the same as the punch tool 2.
It seizes and adheres to the tip of the punch tool 2, and gradually grows as the stock solution introduction hole 3 is drilled, so that the wall surface of the stock solution introduction hole 3 to be drilled becomes streak-like due to the unevenness of the stuck material 4 on the tip of the punch tool 2. This is because scratches or uneven scratches may occur. Furthermore, the tip of the punch tool 2 breaks because when the tip of the punch tool 2 is covered to some extent by the stuck material 4, the punch tool 2 moves upward due to the pressure bond between the stuck material 4 and the spinneret material 1. In this case, the tip part cannot withstand the tensile strength and breaks.

As mentioned above, when spinning with a spinneret that has irregularities or streak-like scratches on the wall surface of the stock solution introduction hole 3, the stock solution adheres to and accumulates on the scratches on the wall surface of the introduction hole 3.
As shown in the figure, the stock solution discharge hole 5 is clogged, or even if the hole is not clogged, the thickness of the spun yarn is uneven.

For this reason, an attempt was made to apply lubricating oil to the spinneret material 1 and drill the raw solution introduction hole 3, but when the tip of the punch tool 2 penetrated into the Ta material to a certain extent, the problem as shown in Fig. 4 was made. As shown, the oil film of the lubricating oil 6 is completely cut off and disappears, and therefore, the tip of the punch tool 2 is heated due to friction with the spinneret material 1 in the same manner as described above, and the lubricant 6 is heated by the punch tool 2. Since Ta does not rapidly remove heat from the tip of the punch tool 2, the Ta sticks to the tip of the punch tool 2, and as the stock solution introduction hole 3 is drilled, the stuck substance grows and seizes with the spinneret material 1, causing it to break. The wall surface of the drilled stock solution introduction hole 3 was extremely rough even though it did not break or break.

The present invention was made in view of the above circumstances, and when drilling a stock solution introduction hole in a wet spinneret made of Ta material having a large number of fine spinning holes,
The holes can be drilled in a mirror-like state without damaging the wall surface, and the tip of the punch tool can be punched without breaking, so the stock solution discharge hole does not get clogged during spinning. It is an object of the present invention to provide a method for manufacturing a spinneret capable of spinning yarn of good quality without causing unevenness in yarn thickness.

As shown in FIG. 5, the method for manufacturing a spinneret of the present invention involves disposing an organic solvent such as 1,1,2-trichlorotrifluoroethane 7 on the upper surface of a spinneret material 1 made of Ta, and then using a punch tool 2. A stock solution introduction hole 3 is bored at the step 3, and then a stock solution discharge hole (not shown) is bored at the bottom of the stock solution introduction hole 3 in the same manner as in the prior art.

As described above, in the method for producing a spinneret of the present invention, the organic solvent 7 is placed on the upper surface of the spinneret material 1 before the stock solution introduction hole 3 is formed in the spinneret material 1. When the introduction hole 3 is bored, even if the tip of the punch tool 2 and the spinneret material 1 are heated due to the friction generated during processing between the tip of the punch tool 2 and the spinneret material 1, Since the organic solvent 7 removes its heat and evaporates, the tip of the punch tool 2 and the spinneret material 1 are cooled. Therefore, the Ta of the spinneret material 1 will not seize and stick to the tip of the punch tool 2, so the tip of the punch tool 2 will not break and the drilled stock solution introduction hole 3 will not break.
All walls will have a smooth mirror surface.

Thus, when spinning with the spinneret made by the manufacturing method of the present invention, the stock solution introduced into the introduction hole 3 flows smoothly into the stock solution discharge hole because the wall surface of the introduction hole 3 has a mirror surface. The stock solution discharge hole will not become clogged and the spun yarn will have no uneven thickness.

As can be seen from the above explanation, the spinneret manufacturing method of the present invention involves drilling a stock solution introduction hole in the spinneret material in manufacturing a wet spinning nozzle made of Ta material having a large number of fine spinning holes. Since an organic solvent is applied before spinning, even if the tip of the punch tool and the spinneret plate are heated due to friction when drilling the raw solution introduction hole with a punch tool, the organic solvent will absorb the heat. It cools down as it evaporates. Therefore, the Ta of the spinneret material does not seize and stick to the tip of the punch tool, the wall surface of the solution introduction hole becomes a mirror surface, the solution discharge hole does not get clogged during spinning, and the thickness of the yarn becomes uneven. This has an excellent effect in that it is possible to easily obtain a spinneret that can spin yarn of good quality.

[Brief explanation of drawings]

Fig. 1 is a partial vertical cross-sectional view showing the method of drilling the stock solution introduction hole in the conventional spinneret manufacturing method, and Fig. 2 is the wall surface of the stock solution introduction hole obtained by the method of drilling the stock solution introduction hole. FIG. 3 is a vertical cross-sectional view of a main part showing the clogged state of the solution discharge hole when spinning into the spinneret having the solution introduction hole shown in FIG. 2, and FIG. FIG. 5 is a partial vertical cross-sectional view showing another conventional method for forming a stock solution introduction hole, and FIG. . 1... Spinneret material, 2... Punch tool, 3...
Stock solution introduction hole, 7...Organic solvent.

Claims (1)

[Claims] 1 In a method for manufacturing a spinneret, a spinning hole consisting of a stock solution introduction hole and a continuous solution discharge hole is bored in a spinneret material made of Ta by a plastic working method,
A method for manufacturing a spinneret, comprising disposing an organic solvent on the upper surface of the spinneret material and then drilling a stock solution introduction hole.