Hybrid cords having high tenacity and high elongation at break

摘要

A hybrid cord, comprising (a) a core yarn consisting of meta-aromatic polyamide fibers, and (b) at least one wrapping yarn consisting of para-aromatic polyamide fibers that warps around the core yarn at a helical angle, wherein (i) the core yarn makes up 20-60% by weight and the wrapping yarn makes up 40-80% by weight of the hybrid cord, based on the total weight of the hybrid cord, (ii) the twist multiplier of the core yarn is 0-0.5, the twist multiplier of the hybrid cord is 4.5-12; and the twist per meter (tpm) ratio between the at least one wrapping yarn and the hybrid cord ranges from 0.8 to 1.2, and (iii) the helical angle of the wrapping yarn is 10-60 degrees.

主权项

1. A hybrid cord comprising:
(a) a core yarn consisting of meta-aromatic polyamide fibers, and (b) at least one wrapping yarn consisting of para-aromatic polyamide fibers that wraps around the core yarn at a helical angle,wherein
(i) the core yarn makes up 20-60% by weight and the wrapping yarn makes up 40-80% by weight of the hybrid cord, based on the total weight of the hybrid cord, (ii) the twist multiplier of the core yarn is 0-0.5, the twist multiplier of the hybrid cord is greater than 5 and no greater than 8.5; and the twist per meter (tpm) ratio between the at least one wrapping yarn and the hybrid cord ranges from 0.8 to 1.2, (iii) the helical angle of the wrapping yarn is 10-60 degrees, and wherein the elongation at break of the hybrid cord is 20% or greater.