JPH01213407A - Spinneret for spinning hollow yarn having fold on outer periphery - Google Patents

Abstract

PURPOSE:To obtain hollow yarn having holds on the outer periphery, by using a spinneret wherein a nozzle protrusively equipped with a spinning solution delivery hole, a spinning solution feed passageway and an air outlet pipe is set and the outlet pipe is concentrically inserted into the spinning solution delivery hole and by spinning. CONSTITUTION:Nylon, etc., are spun by using a spinneret to give high-quality hollow yarn having holds on the outer periphery, uniform thickness and high dimensional accuracy. The spinneret is obtained by boring a through spinning solution delivery hole 11 having slits 12 at equal face intervals on the outer periphery at the center of the bottom of a cap-shaped holder 10 made of stainless steel, setting a spinning solution feed passageway 15 in the circumferential direction in the holder with providing a gap, forming an air inlet passageway 16 at the central part, further protrusively fixing an air outlet pipe 17 to the central part at the left end to give a nozzle 14, furnishing the nozzle and concentrically inserting the air outlet pipe 17 into the spinning solution delivery hole 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a hollow fiber spinning die having pleats on the outer periphery.

(Prior Art) In order to spin a hollow fiber 2 having a plurality of pleats 1, for example, four pleats 1 at equal angular intervals on the outer periphery as shown in FIG. The fibers were spun using a hollow fiber spinning nozzle having a diameter of 3.

(Problems to be Solved by the Invention) By the way, since the above-mentioned spinning solution discharge hole 3 has a complicated shape, it is difficult to manufacture a reamer, and the tool a, b, c
, d, it is difficult to align the tool, and the discontinuities in the circumferential direction of the spinning solution discharge hole 3 A% B, C,
Variations occur in the dimensions of D, and when the hollow fiber is spun, variations occur in the wall thickness in the circumferential direction, especially in the discontinuous parts A, B, and C.
, D are longer than the set dimensions, the fibers are interrupted in the circumferential direction as shown in FIG. 5, and a hollow fiber cannot be obtained.

(Objective of the Invention) The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a spinneret capable of spinning hollow fibers with high dimensional accuracy and good quality and having pleats on the outer periphery. It is something.

(Means for Solving the Problems) In order to solve the above problems, the hollow fiber spinning die according to the present invention having pleats on the outer periphery has slits at equal angular intervals on the outer periphery in the center of the bottom surface of the cap-shaped holder. A spinning solution discharge hole is formed through the holder, a gap is left in the holder, a spinning solution introduction passage is provided in the circumferential direction, an air introduction passage is provided in the center, and an air discharge pipe is protruded from the center of the tip. It is characterized in that a nozzle is attached and an air discharge tube is inserted concentrically into the spinning solution discharge hole.

(Function) As described above, in the hollow fiber spinning nozzle with pleats on the outer periphery according to the present invention, an air discharge tube is inserted concentrically into the spinning solution discharge hole having slits at equal angular intervals on the outer periphery, so that the spinning solution discharge hole is annular and has no discontinuities in the circumferential direction, and has an air discharge pipe in the center, so there is no discontinuity in the circumferential direction when spinning hollow fibers, and the quality is high with uniform wall thickness and dimensional accuracy. A hollow fiber with pleats on the outer periphery is obtained.

(Example) An example of a hollow fiber spinning nozzle with pleats on the outer periphery according to the present invention will be described with reference to FIGS. 1 and 2. 10 is a cap-shaped stainless steel holder with a diameter of 38 m+a;
A diameter of 0.6 mm is placed in the flat center of the bottom of the holder 10.
A spinning solution discharge hole 11 with a length of 0.5 mm and a length of 0.5 mm is bored through the tube. Sleeves 1-12 having a width of 0.1 mm and a depth of 0.6 mm are formed in equiangular squares around the outer periphery of the spinning solution discharge hole 11. The cap-shaped holder 10 has an outer diameter of 26.5 mm on the outer periphery, with a gap between it and the bottom of the holder.
A stainless steel nozzle 14 with a diameter of 27 mm is attached via a Teflon gasket 13 with an inner diameter of 23 mm and a thickness of one inch. Eight spinning solution introduction passages 15 with a diameter of 2.5M and a length of 3m are provided at equal angular intervals in the circumferential direction of the nozzle 14, and an air introduction passage 16 with a diameter of 4InI11 and a length of 8m is provided in the center. This air introduction passage 16 is narrowed at the tip and protrudes from the center of the tip surface, with an outer diameter of 0.4M and an inner diameter of 0.3M.
It is connected to the air discharge pipe 17 of au++. The air discharge pipe 17 is inserted concentrically into the spinning solution discharge hole 11. The nozzle 14 is fixed by a stainless steel nozzle holder 18 screwed into the opening of the cap-shaped holder 10 and having a thickness of 4 mm and a diameter of 30 ffIII. In the circumferential direction of this nozzle holder 18, there are eight pieces with a diameter of 2.5 mm spaced at equal angular intervals.
A spinning solution introduction passage 19 with a diameter of 8 mm and a length of 8 mm is provided and communicated with the spinning solution introduction passage 15 of the nozzle 14, and an air introduction passage 20 with a diameter of 4 mm and a length of 3 mm is provided in the center.
is provided and communicates with the air introduction passage 16 of the nozzle 14. Note that 21 has an outer diameter of 12.5 m, an inner diameter of 4.5 mm, and is placed in the center between the nozzle 14 and the nozzle holder 18.
It is a Teflon packing with a thickness of 1 ma+, and 22 is a rotary tool insertion hole.

When nylon was spun using the hollow fiber spinning nozzle having pleats on the outer periphery of the embodiment constructed as described above, the protruding length of the outer periphery pleats 1 was all 0.2 mm, as shown in FIG.
A hollow fiber 2 having a uniform thickness with an outer diameter of 0.6 mm and a wall thickness of 0.1 mm all around was obtained.

In addition, although the above-mentioned embodiment is a case of a spinneret for spinning hollow fibers 2 in which pleats 1 on the outer periphery are provided in equiangular squares, the present invention is not limited to this.

(Effects of the Invention) As can be seen from the above explanation, according to the hollow fiber spinning die having pleats on the outer periphery of the present invention, the length of the pleats on the outer periphery is uniform, there is no break at the outer periphery, and the wall thickness is uniform throughout the circumference. This has the effect of producing hollow fibers that are uniform, have high dimensional accuracy, and are of good quality and have pleats on the outer periphery.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a hollow fiber spinning nozzle with pleats on the outer periphery according to the present invention, FIG. 2 is an enlarged plan view taken in the direction of arrow A in FIG. 1, and FIG. 4 is a cross-sectional view showing an example of a certain hollow fiber, FIG. 4 is a view showing the shape of the spinning solution discharge hole of the hollow fiber spinning nozzle for spinning the hollow fiber shown in FIG. 3, and FIG. 5 is a cross-sectional view of the hollow fiber shown in FIG. FIG. 3 is a cross-sectional view showing defects in hollow fibers spun by a yarn spinning nozzle. 1... pleat, 2... hollow fiber, 10... holder,
11... Spinning liquid discharge hole, 12... Slit, 13...
...Packing, 14...Nozzle, 15...Spinning liquid introduction passage, 16...Air introduction passage, 17...Air discharge pipe. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] A spinning solution discharge hole with slits at equal angular intervals on the outer periphery is drilled through the center of the bottom of the cap-shaped holder, and a spinning solution introduction passage is provided in the circumferential direction with a gap in the holder to allow air to flow through the center. A hollow fiber with pleats on the outer periphery, characterized in that a nozzle having an introduction passage and an air discharge pipe protruding from the center of the tip is attached, and the air discharge pipe is inserted concentrically into the spinning solution discharge hole. Spinneret.