JPS58169507A - Hollow fiber spinning cap - 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] The present invention relates to an improvement in a hollow fiber spinning die.

Conventionally, K for spinning hollow fibers is shown in Fig. 1.1. b.

As shown in cK, at least one spot in the four circumferential directions of the annular hole was not delivered! Spinning was carried out using a hollow fiber spinning die having a large number of discharge holes 1 and 2.3 in the form of circular slits.

By the way, when hollow fibers are spun using a hollow fiber spinning nozzle having a large number of discharge holes 1 and 2.3 shown in FIG. The fibers that are actually spun from the discharge holes 1 and 2.3 are shown in Figure 2, 51.
As shown in , b, cfC, the joined portion 4 was in a state where the inner and outer edges were drawn], and during the subsequent drawing process, this recessed portion 4 became even thinner, resulting in a yarn with non-uniform cross-sectional dimensions. Since the grooved part forms a groove in the longitudinal direction of the thread, uneven coloring occurs during dyeing, and the depressed part breaks, resulting in what is called a punk thread.

These phenomena occur because when the stock solution discharged from the discharge holes 1, 2.3 is immediately joined, the slit 01 [[[[] is placed near both ends of the slit in order to replenish the volume of the inlet part of the discharge holes 1, 2.3. As a result of movement, discharge source IIO & 9 to obtain a uniform cross section
．． - It is thought that there is a lack of memory.

The present invention has been made to solve such problems.69
It is an object of the present invention to provide a hollow fiber spinning spinneret capable of obtaining circular hollow fibers of uniform wall thickness.

The hollow fiber spinning nozzle of the present invention is provided with a hollow fiber spinning nozzle that is discontinuous at least at one point in the circumferential direction and has a circular slit-shaped discharge hole, in which the slits of the discharge hole are opposed to each other. It is characterized by widening the width at both ends.

The discharge holes in various embodiments of the hollow fiber spinning die according to the present invention will be explained below with reference to FIGS. 3-8 to fK.

In the discharge hole 1IFi shown in Fig. 3aK, a part of the annular hole is made discontinuous to form an occluded slit shape, and the widths of the mutually opposing ends 1a and lb of the slit are expanded outward and thickened. It is something.

The discharge hole xl shown in FIG. 3 is made by discontinuing a part of the annular hole to form an occluded slit shape, and widening the width of the mutually opposing ends 1a and 1b of the slit inward and outward 11. It is made thicker.

The discharge hole 2' shown in Fig. 3cK has annular holes discontinuously discontinuously facing each other to form an occluded slit shape, and the widths of the opposite ends 2a and 2b of each slit are expanded into a circular shape. It is thick and traditional.

The discharge hole 2' shown in FIG. 3dK is formed into a slit shape by discontinuously discontinuing the relative positions of the annular holes, and the widths of the mutually opposing ends 2a and 2b of each slit are expanded into a diamond shape. It is made much thicker.

The discharge hole 3' shown in FIG. 3 afc has an annular hole formed in equiangular triangular positions in the form of a circular slit, and both ends 3a of each slit are opposed to each other.

The width of 3b is expanded into an elliptical shape to make it thicker.

The equiangular triangular positions of the discharge holes 3'u and fjl-shaped holes shown in FIG. 3f are not reached I! The two end portions 3a of each of the slits are formed in the shape of a circular slit and are opposed to each other.

The omitted circular slit-shaped O discharge hole 1 shown in FIGS. 3 to 3 f [shown in FIG.
', 1', 2', 2'' 31. When hollow fibers are spun with each hollow fiber spinning nozzle having a large number of 31.
, 1', 2', 2", 3'.

Since the width of both ends of the slit 3' is wide, the stock solution discharged from each discharge hole is immediately joined at the discontinuous part and the missing circular part 9, and the inside of the joined part is as shown in Fig. 4. A circular hollow fiber having a uniform wall thickness all around without any depressions on the outer surface can be obtained. This only applies to the discharge holes 1', 1', 2'
, 2', 3', and 3" are immediately joined together, and the volume of the omitted circular part of each discharge hole becomes louder. Excessive poly and -m undiluted solution is discharged from both ends of the slit. This is because the polyimide is replenished by the movement of the slit, and the excessive amount of polyimide in the discharged stock solution at both ends of the slit is eliminated.

It should be noted that the shape Fi of both ends of the slit of the discharge hole is not limited to the shape of the above embodiment, but may be any shape as long as the width of both ends of the slit is wide.

As detailed above, if the hollow fiber spinning die of the present invention is used,
An excellent effect is that it is possible to easily obtain circular hollow fibers of uniform wall thickness.Therefore, the cross-sectional dimensions will not become non-uniform even after stretching, and color unevenness will not appear during dyeing. It is.

[Brief explanation of drawings]

Figures 1a, b, and c are diagrams showing the shapes of the discharge holes of conventional hollow fiber spinning nozzles, respectively;
Figures b and c show the cross-sectional shape of the yarn discharged and spun from the discharge holes; Figs. FIG. 2 is a diagram showing a cross-sectional shape of a yarn discharge-spun from the discharge holes in FIGS. 1 to 1f. 11, llll, 2', 2#, 31, 3#・
...Discharge hole of the hollow fiber spinning die of the present invention, 1 m,
lb, 2a21) e3m, 3b - Old... Both ends of the slit. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 3 Figure 4

Claims (1)

[Claims] In a hollow fiber spinning die having a discharge hole in the form of a slit with a noncontinuous circle discontinuous at least at one point in the local direction, the width of the opposite end portions of the slit of the discharge hole is increased.
A spinneret for fine hollow fiber spinning.