JPS5926514A - Spinneret for spinning modified cross-section yarn - Google Patents

Abstract

PURPOSE:A spinneret for spinning modified cross-section yarn, capable of spinning modified cross-section yarn having sharp cross-shaped parts free from expansion at the central part, consisting of divided extrusion holes for stock solution having modified cross-section form and shallow channels connected to these divided extrusion holes for stock solution. CONSTITUTION:A spinneret for spinning modified cross-section yarn, capable of spinning easily the modified cross-section yarn 2' having crossectional cross- shaped form, consisting of the divided extrusion holes 1' for stock solution connected to the feed holes 3 for stock solution, wherein the holes have a cross- shaped form which is divided at the central part and discontiued, and the shallow cross-shaped channels 4 connected to each of the divided extrusion holes 1' for stock solution at the spinning face of the central part surrounded by the divided extrusion holes 1' for stock solution. When spinning is carried out using this spinneret, modified cross-section yarn having sharp cross-shaped parts free from expansion at the central part can be spun.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a spinneret for spinning irregularly shaped yarn by a melt spinning method.

Conventionally, the shape of the stock solution discharge hole of a spinneret for spinning irregularly shaped yarn by the melt spinning method is, for example, a single irregularly shaped stock solution discharge hole 1 as shown in FIG. The yarn spun from 1 is an irregularly shaped yarn 2 with a swollen center and rounded corners as shown in Fig. 2. To obtain an irregularly shaped yarn 2 with sharp corners similar to the stock solution discharge hole IK. I couldn't do it.

In order to solve this problem, a cap having an irregularly shaped stock solution discharge hole 1' having a plurality of divided solution discharge holes 1' as shown in FIG.

Anticipating that the central part of the irregularly shaped yarn will swell, this stock solution dividing discharge hole 1'ti is used to weld in mid-air, the so-called ballooning phenomenon, in order to obtain the irregularly shaped yarn with the desired sharp corners. Although it is for the purpose of
When spinning with a nozzle having There is no difference from the irregularly shaped yarn 2 in Fig. 2 which is spun from the single irregularly shaped stock solution discharge hole 1 shown in Figure 2, and when the volume of the stock solution discharged is small or the winding speed is high, the yarn is bath-coated in extremely fine parts. or completely separated1
That's what happens. Furthermore, even if the irregularly shaped yarn is obtained under optimal conditions, the center of each side will be swollen.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a spinneret capable of spinning irregularly shaped yarn having sharp corners and no bulge in the center.

The irregularly shaped yarn spinning nozzle of the present invention has an irregular cross-sectional shape and a solution dividing discharge hole which is divided into a plurality of parts at the center of the irregular shape. It is characterized in that a conical convex portion is provided on the spinning surface of the central portion.

Hereinafter, an embodiment of the irregularly shaped yarn spinning nozzle according to the present invention will be described with reference to FIGS. 4 and 5. It has a cross-shaped cross section connected to the stock solution introduction hole 3, and each side of the cross is divided at the center so that there is no In a spinneret for irregularly shaped yarn having continuous stock solution dividing discharge holes 1', a central spinning surface surrounded by the stock solution dividing discharge holes 1' is connected to each stock solution dividing discharge hole 1'. A shallow cross-shaped narrow groove 4 is provided.

In this way, when spinning gold with irregularly shaped yarn having the stock solution dividing discharge holes 1' and the cross-shaped narrow grooves 4, the stock solution enters each stock solution dividing discharge hole 1' through the stock solution introduction hole 3, and each of these The undiluted solution is discharged from the divided discharge holes 1/, but during this discharge, the undiluted solution flows into the cross-shaped narrow groove 4 shallower than the edge near the center of each undiluted solution divided discharge hole 1'. The stock solution discharged from the hole 1' is forcibly drawn to the center and reaches the center.

Therefore, even if there are fluctuations in the spinning conditions such as the amount of raw solution discharged, spinning pressure, winding speed, etc., there is no bulge in the center, and the irregularly shaped yarn 2 with a cross-shaped cross section as shown in FIG. 6 has sharp corners.
' can be easily obtained.Next, in order to clarify the effects of the present invention, specific embodiments and conventional examples thereof will be described.

〔Example〕

As shown in Figures 4 and 5, the diameter is 2 WJl and the depth is 19.
A cross section connected to the stock solution introduction hole 3 of U, and each side of the cross shape is divided at the center and is discontinuous with a width of 0.1
aa, a length of 0.5 m, a depth of 1 MJ1, and a diameter of 24 stock solution split discharge holes 1'e, which are surrounded by the stock solution split discharge holes II in Each stock solution dividing discharge hole 1 is provided on the spinning surface in the center.
' Width 0.03m @ depth 0.1 fin, length 0.1
A spinneret for irregularly shaped yarn with a cross-shaped narrow groove 4 of 5 ynn.

[Conventional example]

A plate having a thickness of 20+ and having 24 stock solution introduction holes 3 and continuous stock solution 1-divided discharge holes 1' having the same dimensions and shape as those of the above embodiment.
A spinneret for irregularly shaped yarn, which is made of stainless steel (U) and does not have a cross-shaped narrow groove 4 on the spinning surface in the center surrounded by the stock solution dividing discharge hole 1'.

Polypropylene was melt-spun using the irregular-shaped yarn spinning nozzles of these examples and conventional examples under the conditions of a stock solution discharge rate of I OC/gec, a spinning pressure of 300 r/-1, and a winding speed of 15 rr+/see. As shown in FIG. 2, the yarn spun from the yarn spinning nozzle became an irregularly shaped yarn 2 with a swollen center and rounded corners, whereas the yarn spun from the irregular yarn spinning nozzle of the embodiment As shown in FIG. 6, the yarn spun from the yarn was a irregularly shaped yarn 2' having a cross-sectional shape with no bulge in the center and sharp corners. Also, the amount of stock solution discharged was 0.8
cc/see and winding speed 20m/sec
When melt spinning was carried out under the same spinning pressure of 300 f/- as described above, it was found that the yarn spun from the conventional irregular-shaped yarn spinning nozzle was separated at each dope splitting discharge hole 1'. On the other hand, although the yarns spun from the irregularly shaped yarn spinning nozzles of Examples and Examples were somewhat thinner in the center, there was no significant difference from the irregularly shaped yarn 2' shown in FIG.

Although the above embodiment is a spinneret for spinning irregularly shaped yarn with a cross-shaped cross section, the spinneret for irregularly shaped yarn of the present invention can also be used when spinning irregularly shaped yarns such as T-shaped, Y-shaped, star-shaped, etc. in cross section. It is applicable.

As detailed above, according to the UI for spinning irregularly shaped yarn of the present invention,
It has the advantage of being able to spin irregularly shaped yarns with sharp corners with no bulges in the center, without being affected much by fluctuations in spinning conditions such as the amount of raw solution discharged, the spinning pressure per winding speed, etc. It has a positive effect.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the stock solution discharge hole of a conventional irregular-shaped yarn spinning nozzle, Figure 2 is a diagram showing the cross-sectional shape of irregularly shaped yarn spun from the stock solution discharge hole in Figure 1, and Figure 3 is a conventional FIG. 4 is a longitudinal sectional view showing an example of the solution dividing discharge hole of the irregular-shaped yarn spinning nozzle of the present invention; FIG.
FIG. 5 is a top and oblique view thereof, and FIG. 6 is a diagram showing the cross-sectional shape of the irregularly shaped yarn spun from the stock solution dividing discharge hole shown in FIGS. 4 and 5. 1'... stock solution division discharge hole, 4... cross-shaped narrow groove. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 4 Figure 6

Claims (1)

[Claims] In an irregularly shaped yarn spinning nozzle that has an irregular cross-sectional shape and a solution dividing discharge hole that is divided into a plurality of parts at the center of the irregular shape, each concentrate is divided into two or more parts on the spinning surface of the central part surrounded by the solution dividing discharge holes. A spinneret for spinning irregularly shaped yarn, characterized in that it is provided with a narrow groove that communicates with a discharge hole.