| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sea-island type composite spinneret preventing island component polymers from merging with each other while increasing hole packing density of island component extrusion holes, to form various fiber cross-sectional shapes, especially modified cross sections, with high accuracy, allowing dimensional stability of the various fiber cross-sectional shapes to be maintained at a high level. <P>SOLUTION: A composite spinneret for extruding a composite polymer stream composed of an island component polymer and a sea component polymer, includes: one or more distribution plates in which distribution holes and distribution grooves for distributing each polymer component are formed; and a lowermost layer distribution plate located on a downstream side in a polymer spinning passage direction of the distribution plates, in which a plurality of island component extrusion holes and a plurality of sea component extrusion holes are formed. The composite spinneret has a plurality of hole groups comprising: the sea component extrusion holes arranged on a virtual circumferential line C1 having a radius R1, centering the island component extrusion holes; the sea component extrusion holes arranged on a virtual circumferential line C2 having a radius R2; and the island component extrusion holes arranged on a virtual circumferential line C4 having a radius R4, in which the hole groups are arranged according to a prescribed arrangement. <P>COPYRIGHT: (C)2013,JPO&INPIT |
