FALSE TWIST YARN AND PROCESS FOR PRODUCING THE SAME

WIPO Patent Application WO/2008/007682

A1

A false twist composed of single fibers comprising a polyester ingredient consisting mainly of polytrimethylene terephthalate. The false twist yarn satisfies all of the following requirements: (1) the degree of shrinkage through a 98°C 20-minute wet heat treatment is 5% or lower; (2) the ratio of the degree of shrinkage/expansion through a 90°C 15-minute dry heat treatment (TS) to the degree of shrinkage/expansion through a 90°C 20-minute wet heat treatment (WS), TS/WS, is 0