JPS6065105A - Spinneret - Google Patents

Abstract

PURPOSE:To provide a spinneret capable of preventing the spread of the spinning dope by suppressing the wetting of the spinneret face with the dope, and giving a fiber having stable size and shape, by applying a thin carbon film to the spinning surface of the spinneret and the inner wall of the polymer extrusion nozzle. CONSTITUTION:The objective spinneret is produced by aplying a thin carbon film 5 having a thickness of 0.1-20mu, e.g. sputtered carbon, etc. to the spinning surface 2 of the spinneret 1 and if nesessary, to the inner wall of the polymer extrusion nozzle 4 connected to the polymer introducing hole 3.

Description

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

Traditionally, spinnerets have been made of materials such as platinum, platinum alloys, and stainless steel, but the spinning surface is too wet with the spinning solution, causing the spinning solution to spread out and the shape of the resulting yarn to be unstable. In addition, there was a drawback that the thickness varied, making it impossible to obtain a thread with a desired shape and size.

The present invention has been made to eliminate such drawbacks,
It is an object of the present invention to provide a spinneret that suppresses the wetting of the spinning solution on the spinning surface to prevent the spinning solution from spreading, and that improves the workability of wiping, which is performed to remove foreign substances that adhere during prevention. .

(1) As shown in FIGS. 1 and 2, the spinneret of the present invention has at least the spinning surface 2 of the spinning surface 2 of the spinneret body 1 and the inner surface of the polymer discharge hole 4 which is connected to the polymer introduction hole 3. It is characterized by being coated with a carbon thin film 5.

As described above, in the spinneret of the present invention, since at least the spinning surface 2 is coated with the thin carbon film 5, the hardness of the spinning surface 2 is significantly increased, and the surface of the discharge port 4 is not damaged by wiping or the like. In addition, the wiping properties are good, such as less adhesion of foreign substances and easy removal.In other words, the smoothness and specularity of the spinning surface 2 is improved, the wettability of the spinning solution is suppressed, and as a result, the spinning surface is Spreading of the spinning solution in Step 2 is prevented, the shape of the spun yarn is stabilized, and the thickness is constant, making it possible to obtain a yarn with approximately the required shape and one dimension.

In particular, when the thin carbon film 5 is coated not only on the spinning surface 2 but also on the inner surface of the polymer discharge hole 4, the wettability of the spinning solution at the polymer discharge hole 4 is suppressed, so that the spinning solution can be spun from the polymer discharge hole 4. Since the liquid does not gush out (2), the spinning surface 2 of the spinning liquid due to excess spinning liquid
Spinning is safely prevented, and the spun yarn has extremely high precision in all three dimensions.

The carbon thin film 5 mainly refers to a spunter carbon thin film, but is not limited to this, and may be a carbide crystal. Further, the thickness of the carbon thin film 5 is usually sufficient if it is 0.1 to 20 μm.

Next, specific examples and conventional examples of the spinneret of the present invention will be described.

[Example 1] As shown in Fig. 1, a circular spinneret body 1 made of stainless steel with a thickness 101 and a diameter of 80 m has a polymer introduction hole 3 with a hole diameter of 36111 il, a hole diameter of 2 m, and a length of 9.6 N, and a hole diameter of 200 μm connected thereto. , polymer discharge hole 2 with a length of 400μ
A spinneret is provided with perforations, and the spinning surface 2 is coated with a carbon thin film 5 having a thickness of 5 μm.

[Example 2] As shown in FIG.
) μ, on the inner surface of the spinning surface 2 of the circular dish-shaped spinneret body 1 with a diameter of 901 m and the polymer discharge holes 4 with a hole diameter of 80 μ and a length of 80 μ that are connected to the 3000 polymer introduction holes 3 with a diameter of 400 μ and a depth of 620 μ. A spinneret coated with a thin film 5 of carbon having a thickness of 5μ.

[Conventional example]

As shown in Figure 3, it is made of stainless steel and has a thickness of 700 μm.
3000 polymer introduction holes 3 with a diameter of 400 μm and a depth of 620 μm are bored in the spinneret body 1 in the shape of a circular dish with a diameter of 90 mm, followed by holes 1y! ! A spinneret with a polymer discharge hole 4 having a diameter of 8oμ and a length of 800μ.

However, when spinning was carried out using the spinnerets of Examples 1 and 2 and the conventional example, and the wetness of each spinning surface 2 and the shape and dimension of the obtained yarn were measured, the results shown in the table below were obtained.

(4) As is clear from the table above, the spinneret of Example 1.2 has significantly less spread of the spinning solution on the spinning surface and less variation than the conventional spinneret. Also, Example 1
The shape of the yarn obtained with the spinneret of , 2 is a perfect circle and normal, whereas the shape of the yarn obtained with the conventional spinneret is often abnormally oval. Furthermore, the dimensions of the yarn obtained by the spinneret of Example 1.2 have a small error with the required dimensions, whereas the dimensions of the yarn obtained with the conventional spinneret have a large error with the required dimensions. It turns out that the accuracy is poor.

As can be seen from the above description, the spinneret of the present invention has at least the spinning surface coated with a thin film of carbon, which suppresses wetting of the spinning solution on the spinning surface and prevents the spinning solution from spreading. This has the excellent effect that the shape of the spun yarn is stable and the thickness of the yarn is constant, making it possible to obtain a yarn with substantially required dimensions and shape.

[Brief explanation of the drawing]

(5) Fig. 1 is a sectional view of the main part showing one embodiment of the spinneret of the present invention, Fig. 2 is a sectional view of the main part showing another embodiment of the spinneret of the invention, and Fig. 3 is a sectional view of the main part showing one embodiment of the spinneret of the present invention. FIG. 2 is a cross-sectional view of a main part of a spinneret. 1-----1 spinneret body, 2--spinning surface, 3.
・---Bo (6)

Claims (1)

[Claims] A spinneret characterized in that at least the spinning surface of the spinneret body and the inner surface of the polymer discharge hole are coated with a thin film of carbon.