US 6,668,535 B2 · Heat-resistant crimped yarn

Abstract

The invention provides heat-resistant crimped yarn, of which the constituent heat-resistant high-functional fibers are prevented as much as possible from being deteriorated under heat in the process of producing the yarn. Not losing excellent properties of heat resistance and flame retardancy intrinsic to the heat-resistant high-functional fibers, the crimped yarn has a good elongation percentage in stretch, a good stretch modulus of elasticity and a good appearance, and it fluffs little and releases little dust. The heat-resistant crimped yarn comprises heat-resistant high-functional fibers, and is characterized in that it does not deteriorate under heat, and that its elongation percentage in stretch is at least 6%, its stretch modulus of elasticity is at least 40%, and its tenacity falls between 0.15 and 3.5 N/tex.

Claims11

Dependent claims

A method for producing a heat-resistant crimped yarn, which comprises:

twisting heat-resistant high-functional fiber filaments to form a yarn, heat-setting the yarn through treatment with a high-temperature high-pressure steam or a high-temperature high-pressure water at a temperature between 130 and 250° C., and thereafter untwisting the yarn, to obtain the heat-resistant crimped yarn,
wherein the heat-resistant high-functional fiber filaments are twisted to a twist parameter, K, represented by the following formula, of from 5,000 to 11,000, and are heat-set through treatment with the high-temperature high-pressure steam or the high-temperature high-pressure water at a temperature between 130 and 250° C.:
K=t×D1/2
wherein t indicates the count of twists (/m) of the filaments;
and D indicates the fineness (tex) thereof.

2 more elements

Dependencies are inferred from the claim text.

Heat-resistant crimped yarn

Life of this patent

Heat-resistant crimped yarn

Life of this patent

Abstract

Claims11