POLYESTER-BASED HOLLOW CRIMPED FIBER AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an aromatic polyester-based fiber having both of excellent heat-insulating performance and bulky performance. SOLUTION: This polyester-based hollow crimped fiber has 3-8 hollow parts continuing in the fiber-axis direction, total area of these hollow parts in an amount of 25-60% based on an area surrounded by the outer peripheral part of fiber cross section and three-dimensional crimp based on anisotropy of cross section.