JPH026845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in hollow fiber spinnerets.

Conventionally, in order to spin hollow fibers, a core body or a core gas liquid inlet hole 3 is provided in the center of the spinning solution introduction hole 2 of the spinneret body 1 as shown in FIGS. 1 and 2, and the spinning solution inflows in the circumferential direction. The liquid distribution plates 5, 5' provided with the holes 4 are fitted, and the core liquid or core gas discharge pipe 6 protruding from the center of the lower liquid distribution plate 5' is introduced into the spinning solution. A hollow fiber spinneret 8 inserted into a narrow spinning solution discharge hole 7 following the hole 2 is used. That is, the spinning solution is passed through the spinning solution inlet holes 4 in the circumferential direction of the liquid distribution plates 5 and 5' to the spinning solution introduction hole 2 of the spinneret body 1.
The hollow fiber is discharged and spun from the spinning liquid discharge hole 7, while the core liquid or core gas is introduced into the lower part of the liquid distribution plate 5,
The core liquid or core gas is extruded through the core liquid or core gas inflow hole 4 at the center of the liquid distribution plate 5' to the core liquid or core gas discharge pipe 6 protruding from the center lower side of the liquid distribution plate 5', and is discharged from the spinning liquid discharge hole 7 into the hollow space where the fibers are spun. The hollow shape of the hollow fiber is maintained by discharging a core liquid or core gas into the interior of the fiber.

However, since the core liquid or core gas discharge pipe 6 of the hollow fiber spinneret 8 is extremely thin, it may bend if handled roughly, so it must be handled carefully. If this bending continues repeatedly for a long period of time, it may break at the base.Furthermore, as mentioned above, the core liquid or core gas discharge pipe 6 may bend, causing the hollow fiber to be spun to be misaligned, that is, the inner circumferential circle of the hollow fiber may There are drawbacks such as the center of the outer circumferential circle being offset and the wall thickness varying in the circumferential direction.

The present invention has been made in order to eliminate such drawbacks, and it is an object of the present invention to provide a hollow fiber spinneret in which the core liquid discharge pipe is never bent.

An embodiment of the hollow fiber spinneret according to the present invention will be described below with reference to FIGS. 3 and 4. The same reference numerals as in FIGS. 1 and 2 indicate the same parts, and the explanation thereof will be omitted. A flange 9 is provided on the inner peripheral wall of the intermediate part of the spinning solution discharge hole 7 of the spinneret body 1, and a core liquid or core gas discharge pipe 6 is inserted and held through the inner circumference of the flange 9. A plurality of arc-shaped spinning solution flow holes 10 are provided evenly.

When the hollow fiber spinneret 8' of the present invention having such a structure is used for spinning hollow fibers, the spinning solution is transferred to the liquid distribution plate 5.
The spinning solution is introduced into the lower part of the spinning solution introduction hole 2 of the spinneret body 1 through the circumferential spinning solution inflow hole 4 of 5', is pushed out to the upper part of the spinning solution discharge hole 7, and is introduced into the arc-shaped circumferential direction of the flange 9. The hollow fibers are extruded through the spinning solution distribution hole 10 to the lower part of the spinning solution discharge hole 7 and are connected in the circumferential direction to form a hollow shape, and then the hollow fibers are discharged and spun from the rear lower end. On the other hand, the core liquid or core gas is on the liquid distribution plates 5, 5'
The core liquid or core gas is extruded through the central core liquid or core gas inflow hole 4 into the core liquid or core gas discharge pipe 6, and is discharged from the lower end of the spinning liquid discharge hole 7 into the hollow fiber to be spun. Retained.

In the embodiment, a plurality of spinning solution flow holes 10 are provided in an arc shape, but the shape is not limited to this, and the shape of the spinning solution flow holes 10 may be any shape, such as a square shape or a horseshoe shape, and the number of holes may be singular. It's good.

In spinning such hollow fibers, the hollow fiber spinneret 8' of the present invention has a core liquid or core gas discharge pipe 6.
is inserted into and held by the flange 9 on the inner circumferential wall of the spinning solution discharge hole 7, so the core liquid or core gas discharge pipe 6 will not bend due to vibrations of the spinning solution, and will not break even after long-term use. do not have. Further, since the core liquid or core gas discharge pipe 6 does not bend, the hollow fibers to be spun will not be misaligned. In other words, the centers of the inner circumferential circle and the outer circumferential circle of the hollow fibers to be spun coincide, and the thickness becomes uniform in the circumferential direction. Furthermore, in the hollow fiber spinneret 8' of the present invention, the core liquid or core gas discharge pipe 6 is inserted and held in the flange 9 of the inner circumferential wall of the spinning solution discharge hole 7 as described above, so that the spinneret 8' can be roughly inserted into the spinneret 8'. Since the core liquid or core gas discharge pipe 6 does not bend even when handled, handling is easy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional hollow fiber spinneret, FIG. 2 is a plan view thereof, FIG. 3 is a longitudinal sectional view of a hollow fiber spinneret according to the present invention, and FIG. 4 is a line A-A in FIG. 3. FIG. 1... Spinneret body, 2... Spinning solution introduction hole, 3
...Core liquid or core gas inflow hole, 4...Spinning liquid inflow hole, 5,5'...Liquid distribution plate, 6...Core liquid or core gas discharge pipe, 7...Spinning liquid discharge hole, 8... Conventional hollow fiber spinneret, 8'...Hollow fiber spinneret of the present invention, 9...Flange, 10...Spinning liquid flow hole.

Claims (1)

[Claims] 1. A liquid distribution plate having a core liquid or core gas inflow hole in the center and spinning liquid inflow holes in the circumferential direction is fitted into the spinning solution introduction hole of the spinneret body, and the center lower side of the liquid distribution plate is fitted. In a hollow fiber spinneret in which a core liquid or core gas discharge pipe protruding from the core is inserted into a spinning solution discharge hole following the spinning solution introduction hole, a flange is provided on the inner circumferential wall of the spinning solution discharge hole to remove the core. 1. A hollow fiber spinneret, characterized in that a liquid or core gas discharge pipe is inserted and held therein, and a spinning liquid flow hole is provided in the circumferential direction of the flange thereof.