JPH0376805A - Spinneret for wet spinning - Google Patents

Abstract

PURPOSE:To obtain a fiber such as acrylic fiber preventing the adhesion and end-breakage of fibers by extruding and spinning a spinning dope through a nozzle, immersing the fiber into a coagulation liquid and, at the same time, ejecting the coagulation liquid through a coagulation liquid nozzle placed at a specific position. CONSTITUTION:A spinning dope for acrylic fiber, etc., introduced through a spinning dope inlet hole 2 is extruded in the form of a fiber from the tip of a spinning dope extrusion hole 3 connected to the spinning dope inlet hole 2. The obtained fiber 4 is immersed in a coagulation liquid such as nitric acid 5 and, at the same time, coagulation liquid introduced through a coagulation liquid inlet hole 7 is ejected from a coagulation liquid ejection hole 6 opened at a part free from the above spinning dope extrusion hole 3 to achieve the uniform and good coagulation of the dope and the spinning of the fiber while preventing the adhesion of the fibers and the end-breakage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a wet spinning die used for wet spinning chemical fibers such as rayon and acrylic fibers.

(Prior art) In the wet spinning method, as shown in FIG. 3, a stock solution introduced through a spinning solution introduction hole 2 of a spinning nozzle 1 is discharged from the tip of a spinning solution discharge hole 3 following the spinning solution introduction hole 2 for spinning. In this method, the fibers 4 are coagulated in a coagulating liquid 5.

(Problem to be solved by the invention) By the way, the spinning nozzle 1 used in the above wet spinning method
Because the spinning solution discharge holes 3 are arranged and drilled in a dense manner,
Among the large number of fibers 4 discharge-spun, the fibers 4 discharge-spun from the spinning solution discharge hole 3 in the center of the spinning nozzle 1 are immersed in the coagulation solution 5 which is not fresh, and moreover, the fibers 4 are not sufficiently soaked in this part. Since a clean and fresh coagulating liquid was not supplied, the coagulating effect was poor, and fibers 4 stuck together and thread breakage occurred.

Therefore, the present invention aims to provide a wet spinning nozzle that prevents fibers from sticking together and yarn breakage.

(Means for Solving the Problems) The wet spinning nozzle of the present invention for solving the above problems includes:
In the wet spinning method in which the spun fibers are coagulated in a coagulating liquid by discharging them from the spinning solution discharging holes of the spinning nozzle, a coagulating liquid discharging hole is provided in a portion of the spinning nozzle that does not have the spinning solution discharging hole, and the coagulating liquid discharging hole is It is characterized in that a coagulating liquid introduction hole is provided connected to the inner end of the liquid discharge hole.

(Function) The wet spinning nozzle of the present invention configured as described above discharges and spins the stock solution introduced from the spinning solution introduction hole from the tip of the spinning solution discharge hole following the spinning solution introduction hole during wet spinning. ,
When this fiber is passed through a coagulation liquid and coagulated, the coagulation liquid introduced through the coagulation liquid introduction hole is discharged from the coagulation liquid discharge hole provided in the part that does not have a spinning liquid discharge hole, so that the Clean, fresh coagulation liquid is evenly and sufficiently supplied to the fibers spun from the spinning liquid discharge hole, so coagulation is performed uniformly and well, preventing fibers from sticking together or yarn breakage. Nothing happens.

(Example) An example of the wet spinning nozzle of the present invention will be described with reference to the drawings. In FIG.
It is a rectangular spinning nozzle made of mIII SUS 316, and the spinning nozzle 1 has an inner diameter of 1 mm and a depth of 5.9 m.
The spinning solution introduction holes 2 of m are arranged in a base pattern with an interval of 1.5 mm.
A spinning solution discharge hole 3 having an inner diameter of 0.08 mm and a length of 0.1 mm is perforated concentrically at the bottom of the spinning solution introduction hole 2. The part of the spinning nozzle 1 that does not have the spinning solution discharge holes 3 is defined as
with an inner diameter of 1.5 mm and a depth of 1.5 m vertically and horizontally, with 6 pieces spaced apart.
Thirty-six coagulating liquid discharge holes 6 with a diameter of 3 m are bored, and are connected to the inner end of the coagulating liquid discharge holes 6 with an inner diameter of 3 mm as shown in the right half of FIG.
A coagulating liquid introduction hole 7 with a diameter of mm is provided and opened on the outer circumferential surface of the spinning nozzle l.

On the other hand, as a conventional wet spinneret, there is a spinning nozzle l shown in FIG. 3, which is made of the same material and has the same dimensions as those of the above-mentioned embodiment, but does not have the coagulating liquid discharge hole 6 and the coagulating liquid introducing hole 7.

However, with the wet spinning nozzles of these Examples and the conventional example, the acrylic stock solution was discharged and spun, and the acrylic fibers 4 were immersed in the coagulating liquid nitric acid 5, and at the same time, the wet spinning nozzle of the Examples introduced the coagulating liquid through the coagulating liquid introduction hole 7. The coagulating liquid nitric acid 5 is passed through the coagulating liquid discharge hole 6.
The acrylic fibers 4 were coagulated by discharging clean, fresh nitric acid evenly and sufficiently to the acrylic fibers.

As a result, the acrylic fibers wet-spun with the wet spinning nozzle of the conventional example had many fibers sticking together and many thread breaks, but the acrylic fibers wet-spun using the wet spinning nozzle of the example had many fibers sticking together. , no thread breakage occurred.

(Effects of the Invention) As can be seen from the above explanation, the wet spinning nozzle of the present invention discharges the stock solution from the spinning solution discharge hole, spins it, immerses it in the coagulation solution, and at the same time spins the raw solution through the spinning solution discharge hole, and at the same time spins the raw solution through the spinning solution discharge hole. By discharging a clean and fresh coagulating liquid from the liquid discharge hole, chemical fibers such as rayon, acrylic, etc. can be obtained without fibers sticking together or thread breakage.

[Brief explanation of drawings]

FIG. 1 shows a second embodiment of the wet spinning nozzle of the present invention.
FIG. 2 is a plan view of an embodiment of the wet spinning nozzle of the present invention, and FIG. 3 is a vertical sectional view showing a conventional wet spinning nozzle.

Claims (1)

[Claims] 1. A coagulating liquid discharging hole is provided in a portion of the spinning nozzle that does not have a spinning liquid discharging hole in a wet spinning method in which the spun fibers are coagulated in a coagulating liquid. A wet spinning nozzle characterized in that a coagulating liquid introduction hole is provided connected to a rear end of the coagulating liquid discharge hole.