SPINNERET FOR PRODUCING CONJUGATE FIBER EXHIBITING OPTICAL REFLECTANCE AND INTERFERENCE

摘要

PROBLEM TO BE SOLVED: To provide a spinneret having increased space utility factor and new structure and capable of efficiently and precisely producing a conjugate fiber having laminar cross-section structure, developing luxury color by the reflection and interference of visible rays and exhibiting excellent designability. SOLUTION: Small holes for extruding a polymer material having low refractive index and arranged in a ring form are placed opposite to small holes for extruding a polymer material having high refractive index and arranged in a ring form in a state not to direct the extruding sides of both small holes opposite to each other. Both polymer materials are introduced through the distribution holes for both materials into a laminate-forming groove 26 having annular cross-section. The formed laminated polymer material layer is passed through a tapered thin-layer forming groove 27 having a passing area gradually narrowing with an inclined wall to gradually decrease the thickness of the laminate and finally extruded through an extrusion opening to obtain the objective conjugate fiber having optical reflectance and interference.