To provide a spinneret capable of stably producing an ultrafine fiber.
The spinneret has the following characteristics. (1) The outside diameter of the spinneret is 75-125 mm. (2) Polymer-introducing holes are arranged in 2-6 lines in a circumferential state. (3) The relationship between D2 (mm) defined as two time of maximum value of a line (radius) binding the center of the spinneret and the center of the polymer-introducing hole and the outside diameter D1 (mm) satisfies the formula: 0.6×D1≤D2≤0.85×D1. (4) The relationship between line interval L (mm) of the polymer-introducing holes and an introducing hole diameter D3 (mm) satisfies the formula: 1.3×D3≤L≤6×D3. (5) The numbers of discharge holes per polymer-introducing hole are 2-8. (6) The ratio D4/D3 of D4 (mm) defined as two times of maximum value of a line (radius) binding the center of the polymer-introducing hole and the center of the discharge hole to the diameter D3(mm) of the polymer-introducing hole is 0.5-0.9. (7) Total numbers of discharge holes are 120-600. (8) Discharge holes in one group are not arranged in a radial direction of the spinneret.
KOBAYASHI YASUKI
KINOSHITA NAOYUKI
| JP2002309431A | 2002-10-23 | |||
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