Fancy textured yarn mfr. - by combining two yarns to form slubs using a false twisting device

摘要

The false twist appts. has a false twisting member and a heater at a twisting zone upstream of the member. There is an independent supply of =1 multifilament yarn A and multifilament yarn B into the twisting zone. Yarn B combines with yarn A at a wrapping point. The wrapping point moves reciprocally along the twisting zone in the running direction of A at a running speed less than that of A but greater than half the speed of A. Yarn B is guided and has a running tension controlled to 0.1 but 0.5 of the running tension of A in the twisting zone. The fancy textured yarn emerges from the appts. comprising yarns A and B of which yarn A is thermoplastic. The slubs formed have a regular shape with the central portion thickest and gradually tapering towards the end of the slub.