Low shrinkage, high tenacity poly(epsilon-caproamide) yarn...

Details Low shrinkage, high tenacity poly(epsilon-caproamide) yarn... Low shrinkage, high tenacity poly(epsilon-caproamide) yarn...

D - Textiles, Paper

02

J

18/634

D02J 1/22 (2006.01) D01F 6/60 (2006.01)

Patent

CA 2028062

TITLE Low Shrinkage, High Tenacity Poly(.epsilon.-caproamide) Yarn and Process for Making Same ABSTRACT OF THE DISCLOSURE A polyamide yarn is disclosed which is at least about 85% by weight poly(.epsilon.-caproamide) and which has a relative viscosity of greater than 50, a tenacity of at least about 9.3 g/d, a dry heat shrinkage at 160°C of less than about 3 percent, a modulus of at least about 20 g/d, a toughness of at least about 240 g/d?%, a crystal perfection index of greater than about 82, and a long period spacing of greater than about 100 .ANG.. The process for making the yarn includes drawing of a feed yarn while heating to at least about 185°C in at least a final draw stage to a draw tension of at least 4.8 g/d, subsequently decreasing the tension while heating to at least about 185°C to produce a length decrease of between about 13.5 and about 30%, and cooling and packaging the yarn. Doc. J.6

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