JPH073519A - Production of spinneret - Google Patents

Abstract

PURPOSE:To produce a spinneret having a high accuracy of holes and extremely slight unevenness of denier and capable of spinning into a chemical fiber having a high quality even if the spinning face is spherical. CONSTITUTION:Dope-introducing holes are bored in a plate for spinneret by a punching tool and a swelling part formed on spinning face is removed by grinding and dope discharge holes are penetrated and bored in the bottom of dope-introducing holes by a reamer tool and burr formed on the peripheral edge of opening of the dope discharge holes is removed by grinding and the plate for spinneret is formed so as to have spherical curved face to produce a spinneret. This method for producing the spinneret is characterized in that when dope discharge holes are penetrated and bored in the bottom of the dope introducing holes, elliptical dope discharge holes 6' shortened in radius direction of plate for spinneret by deformed amount of dope discharge holes deformed by formation of curved face of the plate for spinneret are penetrated and bored by a reamer tool 5' having elliptical cross section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a spinneret for spinning high quality chemical fibers.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a spinneret having a spherical spinning surface, a stock solution introduction hole 3 is concentrically multiplexed with a punch tool 2 as shown in FIG. 2 on a plate-shaped spinneret plate 1 shown in FIG. The reamer 4 having a circular cross section as shown in FIG. With the tool 5, a stock solution discharge hole 6 is formed through the bottom of the stock solution introduction hole 3 as shown in FIG. 9, and then a flash 7 formed on the peripheral edge of the stock solution discharge hole 6 is polished as shown in FIG. After removal, the spinning surface 1 of the plate-shaped die plate 1 is removed.
As shown in FIG. 7, a is shaped into a spherical curved surface.

By the way, when the spinning surface 1a of the spinneret plate 1 is curved into a spherical shape after the stock solution discharge hole 6 is bored in this way, the spinneret material is pulled toward the center of the spinneret plate 1,
The hole shape, in particular, the opening shape of the stock solution discharge hole 6 is elliptical as shown in FIG. 10, and the difference between the major axis Y and the minor axis X, Y−X is 0.003.
It was ~ 0.004 mm. This size is very large with respect to the reference diameter of 0.07 mm of the stock solution discharge hole 6 and the hole accuracy is poor. Therefore, the chemical fiber spun from this spinneret has many denier unevenness and the quality is poor.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to provide a method for producing a spinneret, which has improved hole precision, has very little denier unevenness, and is capable of spinning high-quality chemical fibers. is there.

[0005]

A method for manufacturing a spinneret according to the present invention for solving the above-mentioned problems is to form a stock solution introducing hole in a spinneret plate with a punch tool, and then expand a spinneret formed on a spinning surface. After polishing off the protruding part, then using a reamer tool to penetrate the raw solution discharge hole at the bottom of the raw solution introduction hole, then polish off the flash formed on the peripheral edge of the raw solution discharge hole, and then finish In a method for manufacturing a spinneret that shapes a curved surface into a spherical surface, when a stock solution discharge hole is drilled through the bottom of the stock solution introduction hole, it is deformed by the curved surface of the spinneret using a reamer tool with an oval cross section. The present invention is characterized in that an elliptic stock solution discharge hole whose radial direction is short in the radial direction of the die plate by the amount of deformation of the stock solution discharge hole is formed.

[0006]

As described above, in the method for manufacturing a spinneret according to the present invention, when a stock solution discharge hole is formed through the bottom of the stock solution introduction hole, the spinneret plate is deformed by the curved surface shaping of the spinneret plate with a reamer tool having an oval cross section. Because the radial direction of the base plate penetrates the elliptical stock solution discharge hole whose radial direction is short by the amount of deformation of the stock solution discharge hole, if the base plate is then curved into a spherical surface, the elliptical stock solution discharge hole will be By pulling toward the center, the length in the radial direction of the die plate becomes the same as the length in the circumferential direction of the die plate, and a desired stock solution discharge hole of a substantially perfect circle is obtained.

[0007]

EXAMPLE An example of a method for producing a spinneret according to the present invention will be described with reference to the drawings. The inner diameter is 125 mm and the depth is 12.5 shown in FIG.
mm, thickness 0.65 mm, flange outer diameter 141 mm, plate-shaped Ta mouth plate 1 with punch tool 2 as shown in FIG.
17,000 undiluted solution introduction holes 3 of 0.4 mm, taper angle 28 degrees, and depth of 0.6 mm were bored in a concentric multiple circumferential arrangement, and then a bulge formed on the back side of the bottom of each undiluted solution introduction hole 3. 4 was removed by polishing as shown in FIG. 3, and then the minor axis 0.068 mm and major axis shown in FIG.
With a reamer tool 5 ′ having an oval cross section of 0.070 mm, an elliptic stock solution discharge hole 6 ′ having a short radius in the radial direction of the die plate 1 is formed at the bottom of the stock solution introduction hole 3 as shown in FIG. Next, the flash 7 formed around the opening of the stock solution discharge hole 6'is removed by polishing as shown in FIG. 6, and the spinning surface 1a of the spinneret plate 1 is then curved into a spherical surface at 335 mmR as shown in FIG. After shaping, a spinneret 8 having a depth of 18 mm was obtained.

The stock solution discharge hole 9 of the spinneret 8 thus obtained
Is formed by curving the spinning surface 1a of the spinneret plate 1 into a spherical shape so that the spinneret material is pulled toward the center of the spinneret plate 1 and the elliptic stock solution discharge hole 6'has a radial length of 0.070 to 0.0.
71 mm, and the length in the circumferential direction of the base plate is 0.070 to 0.071 mm.
Thus, the desired stock solution discharge hole 9 having a substantially perfect circle is formed. When acrylic was spun with this spinneret 8, good quality acrylic was spun with very few yarn breaks and denier unevenness.

[0009]

As described above, according to the method for producing a spinneret of the present invention, even if the spinning surface is spherical, the hole accuracy is high, and therefore denier unevenness is very small, and it is possible to spin high-quality chemical fibers. You can get a base.

[Brief description of drawings]

FIG. 1 is a diagram showing steps of a method for producing a spinneret according to the present invention.

FIG. 2 is a diagram showing steps of a method for producing a spinneret according to the present invention.

FIG. 3 is a diagram showing steps of a method for producing a spinneret according to the present invention.

FIG. 4A is a view showing a reamer tool for penetrating a stock solution discharge hole in a method for manufacturing a spinneret according to the present invention. FIG. B is a sectional view taken along line AA of FIG.

FIG. 5 is a diagram showing steps of a method for producing a spinneret according to the present invention.

FIG. 6 is a diagram showing steps of a method for producing a spinneret according to the present invention.

FIG. 7 is a diagram showing steps of a method for producing a spinneret according to the present invention.

FIG. 8 is a view showing a reamer tool for penetrating a stock solution discharge hole in a conventional method for manufacturing a spinneret. FIG. B is a sectional view taken along line BB in FIG.

9 is a view showing a state in which a stock solution discharge hole is formed through the reamer tool shown in FIG. 8;

FIG. 10 is a view showing a stock solution discharge hole in a spinneret obtained by a conventional method for manufacturing a spinneret.

[Explanation of symbols]

 1 Mouthplate 2 Punch tool 3 Undiluted solution introduction hole 4 Bulging part 5'Reamer tool with elliptical cross section 6'Elliptical undiluted solution discharge hole 7 Burr 8 Spinneret 9 Substantially circular undiluted solution discharge hole

Claims (1)

[Claims] 1. An undiluted solution introducing hole is formed in a die plate with a punch tool, and then a bulge portion formed on a spinning surface is removed by grinding, and then a undiluted solution discharging hole is formed at the bottom of the undiluted solution introducing hole with a reamer tool. In the manufacturing method of the spinneret, the burrs formed on the periphery of the opening of the stock solution discharge hole are polished and removed, and then the spinneret plate is curved into a spherical shape. When penetrating the undiluted solution discharge hole into the, the reamer tool with an elliptical cross-section is used to create an elliptical undiluted solution discharge hole whose radial direction is short by the amount of deformation A method for producing a spinneret, which comprises perforating.