JPS6246641B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a spinning die for producing synthetic fibers from organic polymers by melt spinning.

When synthetic fibers are produced from organic polymers by melt spinning, various additives such as monomers, low molecular weight substances, or polymerization catalysts contained in the polymers exude near the spinning holes of the spinning nozzle. , evaporate or sublimate and adhere, and then form a gel or protrusions. This disturbs normal ejection, causing a kneeling phenomenon or yarn disorder.

Usually, in order to prevent polymer from adhering to the spinning hole discharge surface of the spinning nozzle, a release agent (e.g. silicone oil, polytetrafluoroethylene, etc.) is applied, or Metals were avoided and protruding spinning holes were used.

However, even with the use of protruding spinning holes, which are said to be the best, it is impossible to completely prevent polymer from adhering to the vicinity of the spinning holes, and the adhesion has been removed using a spatula or the like. Since this deposit has a size of several hundred microns and is firmly attached, cleaning the cap requires skill and a lot of time. In order to easily remove this deposit, there is a method of providing an annular groove around the spinning hole, but it is time-consuming and expensive to provide an annular groove in each of several to tens of thousands of spinning holes. It's too expensive and not a good idea.

The present invention was made to solve this problem, and is a spinning nozzle having a protruding spinning hole from which deposits can be easily removed using a spatula or the like. It is an object of the present invention to provide a method for manufacturing a spinning nozzle having a protrusion having a spinning hole of mm or more in size, and in which the height of the protrusion is the same as the height of the outer periphery of the spinning nozzle plate.

The method for manufacturing a spinning nozzle of the present invention includes forming a spinning face of a concave part of a spinning nozzle plate having one side consisting of a concave portion leaving at least the outer periphery and the other side, which is the back side of the concave portion, having holes that do not pass through. The protrusion is formed using a lower mold jig extruded from the non-penetrating hole, and a spinning hole is provided inside the protrusion, and then the tip of the protrusion is ground to the upper surface of the outer periphery to penetrate the spinning hole. It is something to do.

An embodiment of the method for manufacturing a spinning nozzle according to the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, a hole 2 is drilled on one side of the spinneret plate, and then a recess 4 is formed on the back side with a surface grinder, leaving the outer periphery, and the ground surface of the recess 4 and the hole 2 are Leave layer 3 between. The thickness of this layer 3 is
If it is less than 0.1 mm, cracks will easily occur during the subsequent punching process, and if it is more than 4.0 mm, it will not be possible to form a sufficient spinning hole shape by punching, so a thickness of 0.1 to 4.0 mm is preferable. A wet or dry metal plating layer 6 may be provided on the recess 4 as shown in FIG.

Next, the bottom of the hole 2 is pushed out with a punch or press to form a protrusion 7 as shown in FIG. 2, and a spinning hole 9 is provided inside the protrusion 7.

Next, the tip of the protrusion 7 is lapped and polished using the upper surface 1a of the outer circumferential portion of the spinning nozzle plate 1 as a reference surface, and the protrusion 7 is passed through the spinning hole 9 as shown in FIG. The shape of the spinning holes 9 may be circular or irregular. Further, the tip end face of the spinning hole 9 may be subjected to surface treatment to make it less wettable with the organic polymer. Several grooves may be provided in advance on the upper surface 1a of the outer peripheral portion, for example, grooves 8 as shown in FIG. 5 may be provided to prevent molten polymer from accumulating on the grinding surface 4.

Although one spinning hole has been described above, several to tens of thousands of spinning holes are created.
Some examples of spinning nozzles prepared in this way are shown schematically in FIGS. 6a, b, and c. The blacked out parts in the figure are the recesses 4 and grooves 8 including the spinning holes 9, and the circular protrusions 10 and fan-shaped protrusions 11 at the center in Figs. 6 b and c are the same as those in Figs. 6 a1 and b.
The upper surface 1a of the outer periphery of the spinning hole 9 is at the same height as the top surface of the spinning hole 9 (not shown), and is provided to prevent damage to the spinning hole 9 when removing deposits with a spatula or the like during spinning or after spinning. be.

As detailed above, according to the method for manufacturing a spinning nozzle according to the present invention, a stable spinning nozzle with high dimensional accuracy can be easily manufactured, and the spinning nozzle thus obtained can be used for cleaning work of deposits. It can be operated without the need of skilled workers.

[Brief explanation of the drawing]

1 to 3 are schematic sectional views showing the steps of the method for manufacturing a spinning nozzle according to the present invention, and FIG.
5 is a schematic sectional view showing a state in which a metal plating layer is provided in the concave portion of the spinneret plate shown in the figure; FIG.
FIGS. 6a, 6b, and 6c are schematic diagrams of the planar shapes of completed spinning nozzles, respectively. 1... Spinneret plate, 1a... Upper surface of outer periphery, 2
... hole, 3 ... layer, 4 ... recess, 6 ... metal plating layer, 7 ... protrusion, 8 ... groove, 9 ... spinning hole, 1
0...Circular protrusion, 11...Fan shaped protrusion.

Claims (1)

[Claims] 1. Push out the spinning surface of the concave part of the spinneret plate, which has a concave part on one side leaving at least the outer periphery and the other side, which is the back side of the concave part, has a hole that does not penetrate through the hole. A method for manufacturing a spinning nozzle, which comprises forming a protrusion using a molding jig, providing a spinning hole inside the protrusion, and then polishing the tip of the protrusion to the upper surface of the outer periphery to penetrate the spinning hole.