| 摘要 |
PURPOSE:To spin a high-quality acetate fiber having Y-shaped cross-section and high resistance to aging, stably, by using a spinneret having plural nozzles having a specific cross-section and separated from each other by a specific distance. CONSTITUTION:The cross-section of the nozzle is defined by three straight lines (b) of the sides of a triangle 1 included in the circle 2 having its center at the center of gravity of the triangle and three arcs (a) of the circle 2 included in the triangle 1. A plurality of nozzles are bored with distances of >=2.5mm. between the centers. The length (l) of the arc (a) and the ratio of the arc length (l) to the length (L) of the straight line (b) are set preferably to >=0.006mm. and <=0.30 (preferably 0.23-0.30), respectively.
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