JPS5846112A - Spinneret - Google Patents

Abstract

PURPOSE:A spinneret, obtained by anodizing and heat-treating a laiminated composite material, and having extrusion parts for a spinning solution constituted of tantalum with little abrasion of extrusion holes for the spinning solution and smooth inner surfaces thereof without the attack by a sulfuric acid coagulating solution in a spinning bath. CONSTITUTION:A spinneret is constituted of a laminated composite material prepared by laminating two different materials, e.g. stainless steel and Ta. Extrusion holes 5 for a pinning solution are made of Ta material and anodized to form dense surface layers of tantalum pentoxide on the inner surfaces thereof, and the resultant surface layers are then heat-treated to increase the hardness thereof. Alternatively, a composite material, e.g. Co-base alloy and Ta, Ni-base alloy and Ta, Pt-Au alloy and Ta, Pt-Au-Rh alloy and Ta, may be used.

Description

[Detailed description of the invention] The present invention relates to improvements in spinnerets.

Conventionally, materials such as Pt-Au, Ta, and stainless steel have been used for spinnerets, and stainless steel is particularly widely used because it is inexpensive and has excellent corrosion resistance.

However, in a spinneret made of stainless steel, the inner surface of the raw solution discharge hole is 5-IOF by cutting, and 2-3P by electrical discharge machining.
Since the punching process is as rough as 1'p, the flow of the stock solution during spinning is not smooth and the threads tend to separate.

For this reason, flapping or coating may be considered as a method of smoothing the inner surface of the stock solution discharge hole, but if the diameter of the stock solution discharge hole is 0.04 to 0.1 W, it will be from tens of thousands to several tens of thousands.
Since there are 00,000 pieces, wrapping is extremely difficult.

Furthermore, in coating, it is difficult to apply the coating material to the inner surface of the stock solution discharge hole to a uniform thickness, and the hole diameter may vary, resulting in uneven denier.

Furthermore, when the spinneret made of stainless steel is used for wet spinning of staple fiber, rayon, etc., it is exposed to the sulfuric acid-based coagulating liquid of the spinning bath, and the spinning surface is worn out.

The present invention has been made to solve these problems, and the inner surface of the stock solution discharge hole is smooth, the flow of the stock solution is smooth, and the yarn is easily separated, and it is not affected by the sulfuric acid-based coagulating solution of textiles,
It is an object of the present invention to provide a spinneret which can also be used for wet spinning of rayon and the like, and which also has less wear on the stock solution discharge hole.

The spinneret of the present invention is a spinneret made of a composite material in which different materials are laminated together, and is characterized in that at least the raw solution discharge hole portion is made of tantalum and is anodized and heat treated.

As described above, the spinneret of the present invention, in which the raw solution discharge hole is made of molecular Ta material and anodized, has a glass-like coating of Ta pentoxide formed on the inner surface of the raw solution discharge hole, that is, a dense skin layer. Since the thread is smooth and smooth, the flow of the stock solution is smooth and the thread separation is extremely good.

In addition, the spinneret of the present invention, which has been heat-treated in addition to the above-mentioned anodic oxidation, is resistant to wear because the hardening force i of the raw solution discharge hole portion of the Ta material is extremely high.

Furthermore, since the raw solution discharge hole portion of the Ta material is not disturbed in the sulfuric acid-based coagulating liquid of the spinning bath, the spinneret of the present invention can
It can also be used for wet spinning of rayon etc. without any problems.

In addition to stainless steel and Ta, there are the following combinations of gold materials constituting the spinneret of the present invention.

CO-based alloy and Ta, Ni-based alloy and Ta, Pt-Au alloy and Ta, Pt-Au-Rh alloy and Ta.

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 1] As shown in Fig. 1, the diameter of the spinning section 1 is 120 + u, the diameter of the flange section 2 is 140 w t', and the total thickness is 0.7 II
The spinneret 3 of J is made of composite material and has a diameter of 0.35 m.

A stock solution introduction hole 4 with a length of 0.62 m followed by a diameter of 7
, 07 y, 50 parts of the stock solution discharge holes on the spinning surface 7, in which spinning holes 6' consisting of stock solution discharge holes 5 with a length of 0.08 m are arranged in a staggered manner at 0.45 wa intervals, have a thickness of 0. .2U
'l'' a From 8 to 9, all other parts are made of stainless steel, and Ta is anodized to form the stock solution discharge hole 5.
A glassy coating of 5M Ta is formed on the inner surface and spinning surface 7 of the fiber, and is further heat-treated.

[Embodiment 2] As shown in FIG.
The spinneret 3, which has a diameter of 80 mm and a total wall thickness of 0.5 mm, is made of a composite material, and has a diameter of 0.3 m and a length of 0.42 mm.
a to the stock solution introduction hole 4 (then the diameter is 0,07 ms)
, a spinning hole 6 consisting of a stock solution discharge hole 5 with a length of 0.08 w.
The spinning surface 7 I is arranged in a staggered manner at intervals of 0.4 w.
The lower part of the stock solution discharge hole 5 and the stock solution introduction hole 4 of the tll, the outer periphery of the spinning yarn part 1, and the lower side of the 7 lange 2 are made of a tag with a thickness of 02 mm, and all other parts are made of stainless steel. Ta is anodized to form 5r on the inner surface of the stock solution discharge hole 5 and the outer lower surface of the entire spinneret 3! After IR conversion, a T83 glassy coating was formed and then heat treated.

[Conventional example] As shown in Fig. 3, the diameter of the spinning part l is 80U, and the flange part 2
A spinneret 31 with a diameter of 100 m and a total wall thickness of 0.6 W is made of stainless steel, and on the spinning surface 7 there is a liquid introduction hole 4 with a diameter of 0.35 m and a length of 0.52 U. Next, spinning holes 6 consisting of stock solution discharge holes 5 having a diameter of 0.07 m and a length of 0.08 U are drilled in a staggered manner at intervals of 0.45 y.

However, when these spinnerets of Examples 1 and 2 and the conventional example were used for wet spinning of rayon, the flow of the concentrate did not flow smoothly in the conventional spinnerets because the inner surface of the concentrate discharge hole 5 was rough. However, in the spinneret of Example 1.2, the inner surface of the stock solution discharge hole 5 was smooth, the flow of the stock solution was smooth, and the thread separation was extremely good.

Further, the spinneret of the conventional example was exposed to the coagulating solution of sulfuric acid in the spinning bath, but the spinneret of Example 1.2 was not exposed to the coagulation solution at all.

Furthermore, in the spinneret of the conventional example, the stock solution discharge hole 5 was worn out by about 3P during 600 hours of wet spinning, whereas in the spinneret of Example 1.
In the case of No. 2, the stock solution discharge hole 5 had a high hardness and hardly wore out.

In the spinneret of the present invention as described in detail above, the inner surface of the stock solution discharge hole is smooth, so the flow of the stock solution is smooth, the yarn is easily drawn, and good spinning is performed in both melt spinning and wet spinning.

In addition, since the spinning surface side is made of Ta, it does not get wet in the sulfuric acid-based coagulating solution of the spinning bath during wet spinning, and is not consumed. Furthermore, since the stock solution discharge hole has high hardness and is resistant to wear, there are effects such as less occurrence of changes in the shape of the thread, variations in thickness, etc.

[Brief explanation of drawings]

#! 1 and 2 are longitudinal sectional views showing a spinneret according to the present invention, and FIG. 3 is a longitudinal sectional view showing a conventional spinneret. l...spinning section, 2...7 lunge section, 3
... Spinneret, 4 ... Stock solution introduction hole, 5
...Electrolyte discharge hole, 6...Spinning hole, 7.
...Spinning surface, 8...Ta. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A spinneret made of a composite gold material made by laminating two different materials together, characterized in that at least a part of the raw solution discharge hole is made of tantalum, and the spinneret is made of tantalum and is anodized and heat treated.