Process for making a sized multifilament yarn of an aromatic polyamide
AssigneeAkzo N.V.
InventorEvert Harteman
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Abstract
A multifilament yarn of an aromatic polyamide, in particular poly-p-phenylene terephthalamide, having a tenacity of at least 15 cN/dtex and an initial modulus of at least 400 cN/dtex is provided with a water-soluble size, the filaments of the yarn having a cohesion corresponding to a Manra number not higher than 40. The yarn is made by subjecting a non-sized yarn having a moisture content which is lower than its equilibrium moisture content, while under a tension of at most 0.25 cN/dtex, to a continuous wetting treatment with an aqueous solution of a size and subsequently winding the treated yarn into a yarn package. The yarn package contains a single continuous length of the sized yarn. The sized yarn is suitable as warp and weft yarn in the weaving industry.
Claims6
A process for the manufacture of a multifilament yarn provided with a water-soluble size selected from the group of film-forming materials consisting of polymers built up from acrylic acid or its derivatives and polyesters derived from at least a dicarboxylic acid, at least a diol and a sulphonated dicarboxylic acid, the filaments of the sized yarn having a cohesion corresponding to a Manra number not higher than 40, said process being characterized in that a multifilament yarn of an aromatic polyamide having a tenacity of at least 15 cN/dtex, an initial modulus of at least 400 cn/dtex, and a moisture content which is lower than the equilibrium moisture content of the yarn, is subjected, while under a tension of at most 0.25 cN/dtex, to a continuous wetting treatment with an aqueous solution of a size as aforesaid, and the yarn is subsequently wound into a yarn package.
Dependencies are inferred from the claim text.