Hybrid cords having high tenacity and high elongation at break
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United States of America Patent
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Sep 1, 2015
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app pub date -
Dec 16, 2011
filing date -
Dec 16, 2010
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Abstract
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.
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