JPH039201B2 - - Google Patents

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 solution discharge hole of a spinneret for spinning irregularly shaped yarn by the melt spinning method is, for example, a single irregularly shaped solution discharge hole 1 as shown in FIG. As shown in FIG. 2, the yarn produced was an irregularly shaped yarn 2 with a swollen center and rounded corners, making it impossible to obtain an irregularly shaped yarn with sharp corners similar to the stock solution discharge hole 1. .

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 mid-air, the so-called ballooning phenomenon, in anticipation of the swelling of the center of the irregularly shaped yarn. However, when spinning with such a spinneret having the stock solution split discharge hole 1', it is quite difficult to set conditions such as the stock solution discharge amount, spinning pressure, and winding speed. If it is too high or the amount of stock solution discharged is too large, there will be no difference from the irregularly shaped yarn 2 shown in FIG. 2, which is spun from the single irregularly shaped stock 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 yarn will be swollen at the center of each side.

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

The irregularly shaped yarn spinning nozzle of the present invention has an irregular cross-sectional shape and a rectangular discharge hole that divides the raw solution into a plurality of parts at the center of the irregular shape. It is characterized in that a narrow undiluted solution auxiliary discharge hole is provided in the enclosed central part, which is connected to each undiluted solution dividing rectangular discharge hole over the entire length and is shorter than the length of the undiluted solution divided rectangular discharge hole. be.

Hereinafter, one embodiment of the irregularly shaped yarn spinning nozzle according to the present invention will be described with reference to FIGS. 4 and 5. The cross section is cruciform connected to the stock solution introduction hole 3, and each side of the cruciform is divided at the center. In a spinneret for irregularly shaped yarn having discontinuous stock solution dividing discharge holes 1',
A central part surrounded by the stock solution dividing rectangular discharge holes 1' is continuous with each stock solution dividing rectangular discharge hole 1' over the entire length,
Further, a cross-shaped narrow undiluted solution auxiliary discharge hole 4, which is shorter than the length of the undiluted solution dividing rectangular discharge hole, is provided.

When spinning with the irregularly shaped yarn spinning nozzle having the stock solution dividing rectangular discharge hole 1' and the stock solution auxiliary discharge hole 4, the stock solution enters each stock solution dividing rectangular discharge hole 1' and the stock solution auxiliary discharge hole 4 from the stock solution introduction hole 3, Since the stock solution is discharged from these discharge holes 1' and 4, the stock solution discharged from each stock solution dividing rectangular discharge hole 1' is discharged from the stock solution auxiliary discharge hole 4.
The undiluted solution discharged from the pipes is always connected and integrated. Therefore, even if the spinning conditions such as the amount of raw solution discharged, the spinning pressure, and the winding speed vary, the irregularly shaped yarn 2' having a cross-shaped cross section as shown in FIG. can be obtained easily.

Next, in order to clarify the effects of the present invention, specific examples and conventional examples thereof will be described.

〔Example〕

Diameter 2.0mm, depth as shown in Figures 4 and 5
A stock solution dividing rectangle with a width of 0.1 mm, a length of 0.5 mm, and a depth of 0.5 mm, which has a cross-shaped cross section connected to the 9.5 mm stock solution introduction hole 3, and each side of the cross is divided at the center and is discontinuous. In the spinneret for irregularly shaped yarn made of stainless steel with a plate thickness of 10 mm and having 36 discharge holes 1', each of the raw solution dividing rectangular discharge holes 1' and Width that spans the entire length
A spinneret for irregularly shaped yarn, which is equipped with a cross-shaped stock solution auxiliary discharge hole 4 of 0.04 mm and 0.2 mm in length and width.

[Conventional example] It is made of a stainless steel plate with a thickness of 10 mm and has 36 stock solution introduction holes 3 having the same size and shape as the previous embodiment and 36 stock solution dividing rectangular discharge holes 1' connected thereto, and is surrounded by the stock solution dividing rectangular discharge holes 1'. A spinneret for irregularly shaped yarn spinning which does not have a stock solution auxiliary discharge hole 4 in the central part.

Polypropylene was melt-spun using the irregular-shaped yarn spinning spinnerets of these examples and conventional examples under conditions of a stock solution discharge rate of 1 cc/sec, a spinning pressure of 30 Kg/cm ² , and a winding speed of 60 cm/sec, and the irregular-shaped yarn of the conventional example. As shown in FIG. 2, the yarn spun from the spinning nozzle became irregularly shaped yarn 2 with a swollen center and rounded corners. As shown in FIG. 6, the spun yarn was a irregularly shaped yarn 2' having a cross-sectional shape with no bulge in the center and sharp corners. In addition, the yarn was melt-spun with a low stock solution discharge rate of 0.8 cc/sec, a high winding speed of 65 cm/sec, and a spinning pressure of 30 kg/cm ² , the same as in the previous paper. In contrast, the yarn spun from the irregularly shaped yarn spinning nozzle of the example was slightly thinner in the center, but was significantly different from the irregularly shaped yarn 2' shown in Figure 6. There was no.

Although the above-mentioned embodiment is a spinneret for spinning irregularly shaped yarn with a cross-shaped cross section, the spinneret may also be used for spinning irregularly shaped yarns such as a T-shaped, Y-shaped, or star-shaped cross section. Further, the stock solution auxiliary discharge holes 4 in which the stock solution dividing rectangular discharge holes 1' are connected over the entire length are not limited to the cruciform shape, but may be changed as appropriate depending on the shape of the irregularly shaped yarn to be spun, such as Y-shape or radial shape.

As detailed above, according to the spinneret for irregularly shaped yarn of the present invention, the quality is such that it has sharp corners that do not bulge in the center even when there are fluctuations in spinning conditions such as stock solution discharge amount, spinning pressure, and winding speed. It has the excellent effect of being able to spin good irregularly shaped yarn.

[Brief explanation of the drawing]

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 cross-sectional view showing an example of the rectangular solution dividing discharge hole and the auxiliary solution auxiliary discharge hole of the irregularly shaped yarn spinning nozzle of the present invention, and FIG. Inhibition map, Figure 6 is 4th and 5th
It is a figure which shows the cross-sectional shape of the irregularly shaped yarn spun from the stock solution dividing rectangular discharge hole and the stock solution auxiliary discharge hole shown in the figure. 1'...Stock solution dividing rectangular discharge hole, 4...Stock solution auxiliary discharge hole.

Claims (1)

[Claims] 1. In an irregularly shaped yarn spinning nozzle having an irregular cross-sectional shape and a rectangular discharge hole that divides the stock solution into a plurality of parts at the center of the irregular shape, each stock solution is 1. A spinneret for spinning irregularly shaped yarn, characterized in that a narrow stock solution auxiliary discharge hole is provided which is continuous with the divided rectangular discharge holes over the entire length and is shorter than the length of each stock solution divided rectangular discharge hole.