Patent ID: 7958714
Filing Date: 2011-06-14
Classification: D02G

Abstract:
1. A false twisting yarn comprising monofilaments containing a polyester component of which a main component is polytrimethylene terephthalate, and satisfying characteristics (1) to (3): (1) a shrinkage ratio by wet heat treatment at 98° C. for 20 minutes is 5% or less; (2) a ratio (TS/WS) of elastic stretch ratio after wet heat treatment at 90° C. for 20 minutes (WS) and elastic stretch ratio after dry heat treatment at 90° C. for 15 minutes (TS) is, 0<TS/WS≦1; and (3) a tensile strength is 2.0 cN/dtex or more; wherein the monofilament is a composite fiber which contains a polyester component (A) of which main component is polytrimethylene terephthalate and other polyester component (B), and these components (A) and (B) are composited in a substantially concentrically core sheath configuration along the fiber length direction.