Process for the production of effect yarns
AssigneeImperial Chemical Industries PLC
InventorsWerner Doschko, Hans Pscheidl
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Abstract
Producing effect yarns using the false twist principle by varying the twist density in the heater zone to alter the degree of bulk and thus the texture along the length of the finished yarn.
Claims10
In a process for the production of a continuously textured effect yarn wherein a yarn is continuously false twist textured, said process comprising forwarding a yarn to be textured from feed means sequentially through a heated zone wherein it is heated to a temperature above its second order transition temperature, a cooling zone, and a false twisting zone to a takeup zone, wherein the twist imposed in the false twisting zone runs back into the heating zone, the improvement which comprises periodically reducing the twist set in the yarn to corresponding vary the degree of bulk along the length of said yarn at constant yarn and twisting speed.
In an apparatus for the production of continuously textured effect yarns comprising yarn feed means, means for heating the yarn to a temperature above its second order transition temperature, means for false twisting comprising a friction twist bush which bears against the yarn, and takeup means, the improvement constituting means for periodically reducing the twist set in the yarn, said means comprising a yarn guide for altering the arc of contact between the twist bush and the yarn.
Dependencies are inferred from the claim text.