| 摘要 |
PURPOSE: To provide a spinneret capable of affording fibers of an optical noncircular cross section in spite of a circular shape of spinning solution discharge holes in wet spinning. CONSTITUTION: This spinneret is used for producing a noncircular cross-section fiber by wet spinning and at least two or more circular discharge holes are bored as a unit spinning solution discharge hole in order to form one fiber in a prescribed arrangement corresponding to the shape of the objective fiber cross section. When noncircular cross-section fibers are conventionally produced, a spinneret having discharge holes of a shape according to the shape of the fibers is used. Fine machining is difficult and cost is high in the machining of the spinneret for obtaining fibers of a complicated cross-sectional shape and the spinning speed, i.e., fiber productivity is sacrificed as a result of limitation on strength of a deformed machined part. Since the discharge hole cross section itself is the circular form, the production cost can be reduced to contribute to an improvement in pressure resistance and further to an improvement in production speed. An optional fiber cross-sectional shape is obtained by a pattern of the hole arrangement. |
