| 摘要 |
PROBLEM TO BE SOLVED: To provide cellulose acetate fiber which is excellent in gloss stability. SOLUTION: For producing the cellulose acetate fiber, the hole shape is a polygon with n sides whose all interior angles are less than 180 degrees (n is an even number of 8-14), when the length of the longest line which connects arbitrary two points on the polygonal periphery is set to be a and the length of the longest line which connects two points on the periphery which intersects perpendicularly with the longest line is set to be b, the line of the length a and the line of the length b divide each other into two almost equally, and dry spinning is carried out using a spinneret shaped in a polygon which satisfies 1.10≤a/b≤1.50, then, the flat cellulose acetate fiber has 6-15 protruded parts in a fiber cross section and a cross-section with numerous processes whose flatness degree is 1.30-2.00. COPYRIGHT: (C)2011,JPO&INPIT |
