Polyester conjugate crimped yarns, process for preparation thereof, and polyester stretch fabrics.

摘要

Polyester conjugate crimped yarns prepared by conjugate spinning (1) an A component substantially comprising polybutylene terephthalate and (2) a B component substantially comprising polyethylene terephthalate at a weight ratio of 30:70 to 70:30 in a side-by-side or eccentric sheath-core arrangement, rendered crimpable by false twisting to a degree of crimpability TC10 of 8% or more when subjected to a boiling water treatment under a load of 10 mg/de. The polyester conjugate crimped yarn can be obtained by subjecting the conjugate yarn to single-heater false twisting under the conditions which satisfy the following relations: TW>/=24380/ 2ROOT De (i) 185+50 [ eta ]B>/=T>/=150 (ii) where TW is the number of false twists (T/m); De is the total denier of the yarn after false twisting; T is the temperature in 0 DEG C. of the false twister heater; [ eta ]B is the intrinsic viscosity of the B component. Stretch woven fabrics having a stretch percentage of 15% or more can be obtained by weaving the above-mentioned polyester conjugate crimped yarns.