JPS6354494B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a protruding nozzle having irregularly shaped spinning holes in a spinneret.

As shown in FIG. 1, the protruding nozzle in the spinneret has an extremely small tip surface area and an extremely small curvature of the periphery of the tip so as to prevent adhesion of molten polymer and yarn breakage. is necessary.

By the way, in order to form a protruding nozzle having irregularly shaped spinning holes in a conventional spinneret, first, the method shown in FIG.
As shown in Fig. 2b, a large number of blind polymer guide holes (only two are shown in the figure) are cut in the spinneret plate 2, and then a punch tool (not shown) is used to punch the polymer as shown in Fig. 2b. A Y-shaped irregularly shaped spinning hole 4 is bored at the bottom of the guide hole 3 to form a bulge 5 on the spinning surface 2a,
Next, as shown in FIG. 2c, the tip of the bulging portion 5 was ground to open the irregularly shaped spinning hole 4, thereby forming the protruding nozzle 1.

As shown in FIG. 3, the tip surface 7 of the protruding nozzle 1 formed in this way has thicknesses of 7a, 7b, 7c and 7d, 7e, 7f around the irregularly shaped spinneret 4.
, the wettability of the periphery of the irregularly shaped spinning hole 4 varies, which tends to cause deformation of the yarn shape during spinning, and molten polymer tends to adhere to the parts 7d, 7e, and 7f, and gradually accumulates. As a result, thread breakage occurs.

Therefore, in order to eliminate the variation in thickness around the irregularly shaped spinning hole 4 on the tip surface 7 of the protruding nozzle 1, the fourth
As shown in the figure, a protruding nozzle 1' is formed using a die 9 having a Y-shaped irregular spinning hole 4 and a die hole 8 of the same shape.
However, since the constraining force on the punch tool is large when drilling the irregularly shaped spinning hole 4, the punch tool is damaged and it is not possible to obtain the irregularly shaped spinning hole 4 with a small area of the tip surface. It is.

The present invention has been made in view of the above-mentioned circumstances, and provides a protruding nozzle having an irregularly shaped spinning hole that can uniformly reduce the thickness around the irregularly shaped spinning hole at the tip surface of the protruding nozzle that opens the irregularly shaped spinning hole. The purpose of this invention is to provide a molding method.

An embodiment of the method for forming a protruding nozzle having irregularly shaped spinning holes in a spinneret according to the present invention will be explained below with reference to the drawings. First, as shown in FIG. Guide hole (2 in the figure)
(Only shown) Cut 3. Next, Figure 5b
As shown in the figure, a Y-shaped irregularly shaped spinning hole 4 is punched at the bottom of each polymer guide hole 3 using a punch tool (not shown) to form a bulge 5 on the spinning surface 2a. Then the fifth
As shown in FIG. c, the spinning surface 2a is polished to eliminate the bulge 5, open the irregularly shaped spinning holes 4, and smooth the spinning surface 2a. Thereafter, as shown in FIG. 5d, the area around the irregularly shaped spinning hole 4 is subjected to electrical discharge machining using a hollow electrode 10 of the same shape as the irregularly shaped spinning hole 4, leaving a thickness of at least 0.01 mm to form the spinning surface 2a. A protruding nozzle 1 having the same height as is formed.

As described above, in one example of the method for forming a protruding nozzle of the present invention, the bulge 5 generated on the spinning surface 2a due to punching is removed by polishing the spinning surface 2a to open the irregularly shaped spinning holes 4, and the spinning surface 2a is smoothed. Therefore, after the protruding nozzles 1 having the same height as the spinning surface 2a are formed by electric discharge machining, there is no need to polish the spinning surface 2a, and each protruding nozzle 1 shown in FIG.
The thickness around the irregularly shaped spinning hole 4 on the tip surface 7 of the nozzle is uniform and minimal, and as shown in FIG. 6b, the curvature of the tip periphery of the protruding nozzle 1 is minimal,
An ideal protruding nozzle 1 as roughly shown in FIG.
is obtained.

Therefore, a spinneret 1 having such a protruding nozzle 1
Since the wettability of the periphery of the irregularly shaped spinning hole 4 is uniform and good, the shape of the yarn is not deformed during spinning, and the molten polymer does not adhere and accumulate on the periphery of the irregularly shaped spinning hole 4, preventing yarn breakage. will never occur. In the examples, the irregularly shaped spinning holes were formed by punching, but the invention is not limited to this, and electric discharge machining may also be used.

As detailed above, the molding method of the present invention can easily mold a protruding nozzle having an irregularly shaped spinning hole on a spinneret without causing deformation of the spinning shape or yarn breakage, and therefore can replace the conventional molding method. It can be said that this is an innovative molding method that allows for

It should be noted that the shape of the irregularly shaped spinning holes 4 in the molding method of the present invention is not limited to the Y-shape.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the ideal shape of a protruding nozzle in a spinneret, FIGS. Figure 3 is an enlarged bottom view showing the tip surface of the protruding nozzle obtained by the molding method;
FIG. 4 is a cross-sectional view of a main part of a conventional method for forming a protrusion nozzle having irregularly shaped spinning holes, and FIGS. 6A is a bottom view showing the tip end face of a protruding nozzle obtained by the molding method, and FIG. 6B is a bottom perspective view showing the protruding nozzle. DESCRIPTION OF SYMBOLS 1... Protrusion nozzle, 2... Spinning face plate, 3... Polymer guide hole, 4... Irregularly shaped spinning hole, 5... Swelling part,
7... Tip surface of protruding nozzle, 8... Die hole, 9
……Thailand.

Claims (1)

[Claims] 1. Cut a large number of blind polymer guide holes in the spinneret plate, then drill and open irregularly shaped spinning holes at the bottom of each polymer guide hole, and then open the irregularly shaped spinning holes by at least 0.01 mm or more around the irregularly shaped spinning holes. 1. A method for forming a protruding nozzle having irregularly shaped spinning holes in a spinneret, characterized in that the protruding nozzle is formed at the same height as the spinning surface by electrical discharge machining while leaving a thickness.