JPS5926512A - Spinneret for spinning modified cross-section yarn - Google Patents

Abstract

PURPOSE:To obtain modified cross-section yarn having sharp cross-shaped parts free from expansion at the central part, by using a spinneret equipped with a conic protrusion on the spinning face at the central part surrounded by plural divided bored extrusion holes, so that spun stock solutions extruded from the spinneret are combined. CONSTITUTION:For example, in a spinneret for spinning modified cross-section yarn having spinning holes with a form wherein each side of a cross is closed at the position close to the central part of the spinneret and divided into the four extrusion holes 1', to spin modified cross-section yarn having a cross-shaped cross section, the spinneret face at the central part surrounded by the four extrusion holes 1' is equipped with the conic protrusion 4. The spinning stock solution extruded from the end parts of the divided extrusion holes 1' at position close to the central part of the spinneret among the stock solution extruded from this spinning spinneret is made to flow along the conic protrusion 4, the stock solution is incorporated with other stock solutions extruded from the other extrusion holes 1' at the tip of the protrusion 4, and they are combined, to give the modified cross-section yarn 2' having sharp cross-shaped cross section free from expansion at the central part.

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. As shown in Fig. 2, the yarn spun from the yarn is an irregularly shaped yarn 2 with a bulge in the center and rounded corners. 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.

This stock solution dividing discharge hole 1' is designed to obtain irregularly shaped yarn with the desired sharp corners by welding in the air, the so-called ballooning phenomenon, in anticipation of the center part of the irregularly shaped yarn swelling. However, when spinning with a spinneret having such a stock solution split discharge hole 1', the I/C must be set at a considerable distance, such as the stock solution discharge amount, spinning pressure, per winding speed, etc. For example, if the spinning pressure is too high or the amount of raw solution discharged is increased, there will be no difference from the irregularly shaped yarn 2 shown in FIG. 2, which is spun through the single irregularly shaped raw solution discharge hole 1 shown in FIG.

Furthermore, if the amount of raw solution discharged is small or the winding speed is high, the parts will be welded together at extremely thin parts or will be completely separated. Furthermore, even if the irregularly shaped yarn is obtained under optimal conditions, the center of each side will be swollen.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a spinneret that can spin irregularly shaped yarn that has no bulge in the center and has sharp corners.

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. Feature f: A conical convex portion is provided on the spinning surface of the central portion.

An embodiment of the irregularly shaped yarn spinning nozzle according to the present invention will be described below with reference to FIG. 4 and FIG. In the spinneret for irregularly shaped yarn having a continuous solution dividing discharge hole 1', a conical convex portion 4 is provided on the spinning surface at the center surrounded by the concentrate dividing discharge hole 1'. There is.

When spinning with the irregularly shaped yarn spinning nozzle having the stock solution dividing discharge hole 1' and the conical convex portion 4, the stock solution is transferred to the stock solution introduction hole 3.
The undiluted solution enters each undiluted solution divided discharge hole 1', and is discharged from each undiluted solution divided discharge hole 1', but during this discharge, a conical convex is formed from the edge near the center of each undiluted solution divided discharge hole 1'. Since the stock solution flows along the portion 4, the stock solution discharged from each stock solution division discharge hole 1/ is connected at the tip of the convex portion 4 and becomes one body. Therefore, without setting strict conditions such as stock solution discharge amount, spinning pressure and take-up speed, it is easy to produce irregularly shaped yarn 2' with a cross-shaped cross section as shown in Fig. 6, which has no bulge in the center and has sharp corners. First, in order to clarify the effects of the present invention that can be obtained, specific embodiments and conventional examples thereof will be described.

〔Example〕

As shown in Figures 4 and 5, the width is 2 mm in diameter and 19 mm in depth, and 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, making it discontinuous. 0.1 yu
x, length 0.5 m, depth 1u, stock solution discharge volume 1
In the spinneret for irregularly shaped yarn made of stainless steel with a plate thickness of 20 pux and having 24 holes 1', the stock solution dividing discharge hole 1'
A diameter of 0.15 m5. A spinneret for spinning irregularly shaped yarn, which is provided with a conical convex portion 4 having a height of 0.15 mm.

[Conventional example]

A plate having a thickness of 20 m5 and having 24 stock solution introduction holes 3 and continuous solution split discharge holes 11 having the same size and shape as the above embodiment.
A spinneret for spinning irregularly shaped yarn, which is made of stainless steel and does not have a conical convex part 4 on the spinning surface of the central part, which is rotated around the undiluted solution dividing discharge hole.

With the spinneret for irregularly shaped yarn of these embodiments and conventional examples, the discharge amount of stock solution is 1 t, and the spinning pressure is 3 OO? ,) Winding speed 15 m
When polypropylene melt-spun was carried out under the conditions of 1 sec, the yarn spun from the conventional irregular-shaped yarn spinning nozzle became irregular-shaped yarn 2 with a cross-sectional shape in which the center part was swollen and the corners were rounded, as shown in FIG. On the other hand, the yarn spun from the irregular-shaped yarn spinning nozzle of the example was irregular-shaped yarn 2' having a cross-sectional shape with no bulge in the center and sharp corners, as shown in FIG.
It became. Also, the discharge amount of the stock solution is Q, 8c CAec
When melt spinning was carried out under the same conditions as above, the winding speed was as high as 20 m/(8), and the spinning pressure was 300 f/-, the yarn spun from the conventional irregular-shaped yarn spinning nozzle was as follows. ,
In contrast, the yarn spun from the irregularly shaped yarn spinning nozzle of the example had an irregular shape as shown in FIG. There was no significant difference from thread 2'.

The above embodiment is a spinneret for spinning irregularly shaped yarn having a cross-shaped cross section, but the spinneret for irregularly shaped yarn of the present invention has a cross section Il+
It can also be applied to spinning yarns with irregular shapes such as letter-shaped, Y-shaped, and star-shaped yarns.

Further, the conical convex portion provided at the center of the quadruple portions of the stock solution dividing discharge holes 1' is not limited to a conical shape, but may be a pyramidal shape.

According to the spinneret for irregularly shaped yarn of the present invention detailed above,
It has the excellent effect of being able to spin irregularly shaped yarn having sharp corners with no bulge in the center without being affected by spinning conditions such as the amount of raw solution discharged, the spinning pressure and the winding speed.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of a conventional gold stock solution discharge hole for spinning irregularly shaped yarn, 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. 4 is a longitudinal cross-sectional view showing an example of the solution dividing discharge hole of the conventional irregular-shaped yarn spinning spinneret, and FIG. 5 is a top perspective view thereof. , 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... conical convex part. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 6

Claims (1)

[Claims] In an irregularly shaped yarn spinning nozzle having 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, a conical shaped spinneret is formed on the spinning surface of the central part surrounded by the concentrate dividing discharge hole. A spinneret for spinning irregularly shaped yarn, characterized by being provided with a convex portion.