Process for preparing a high strength aramid spun yarn
AssigneeE. I. Du Pont de Nemours and Company
InventorHerbert G. Lauterbach
Life of this patent
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Abstract
High strength, high modulus, continuous filament aromatic polyamide yarns are stretch broken under high tension while being sharply deflected in a lateral direction by mechanical means to provide a sliver which is processed by conventional means to a high strength, high modulus spun yarn. The broken ends of the fibers are highly fibrillated to fibrils having lengths of 50-350 times the diameter of the unfibrillated portion of each fiber.
Claims4
Process for preparing a sliver of stretch broken high strength, high modulus p-aramid fibers by feeding a yarn or tow of continuous p-aramid filaments having a filament tenacity of at least 18 gpd and a filament modulus of at least 400 gpd under low tension into a tensioning zone, tensioning the filaments almost to their breaking tension, randomly breaking the tensioned filaments by sharply deflecting them laterally with interdigitating mechanical deflectors, removing the resulting sliver from the tensioning zone and optionally crimping the filaments.
Dependencies are inferred from the claim text.