Improvements in thermoplastic yarn rebound texturizing methods

Abstract

Improvements in thermoplastic yarn rebound texturizing method are provided by advancing a plurality of continuous filament yarns at different speeds into a stream of heated fluid advancing longitudinally of the yarns, hurling the yarns toward a foraminous surface by means of the stream of fluid while passing at least part of the stream of fluid through the surface, impinging the advancing yarns on the foraminous surface with sufficient force to induce compression crimps in the filament of at least the faster fed yarn, instantaneously rebounding the yarns from the foraminous surface, and continuously controlling the actual compaction of the yarn as it moves away from the crimping zone. The rates of advancement of the yarns respective to the fluid stream are such that at least one yarn is introduced into the system at a rate at least twice the rate of the other. The result is a novel yarn in which the more slowly fed yarn serves as a core and the more rapidly fed yarn serves as a cover or 'effect' yarn with its filaments providing rebound texturized loops protruding laterally from the core. The crimped filaments are entangled with one another and the effect yarn is entangled with the core to give the yarn product stability and integrity, permitting it to be processed into fabrics and the like on conventional equipment. An additional slub yarn effect may be achieved by slowing the core yarn feed, thus periodically forming overfed yarn slubs or nodules on the effect yarn product.