Flat nylon 66 yarn having a soft hand, and process for making same
AssigneeMonsanto Company
InventorsJames E. Bromley, Michael M. McNamara, Wayne T. Mowe
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Abstract
Nylon 66 yarn having particular stress-strain properties, typically also having a soft, luxuriant hand in fabric form. As compared to conventional nylon 66 with comparable boiling water shrinkage, the novel yarn exhibits a higher modulus at break, a lower modulus at 10% elongation, a positive stress index, and excellent denier uniformity. The process involves subjecting the yarn, within 0.016 to 0.11 seconds after solidification of the filaments, to a tension of 0.2 and 1.5 grams per final denier and heating the yarn to a temperature between 50.degree. and 250.degree. C. long enough to reduce yarn retraction below 1%.
Claims22
A bobbin having wound thereon a flat nylon 66 yarn having a substantially constant cross sectional configuration along its length, a shrinkage S less than 8.5%, an initial modulus greater than 15 g/d, a positive stress index .varies., and a retraction less than 1%.
A bobbin having wound thereon a flat nylon 66 yarn having a substantially constant cross sectional configuration along its length, a shrinkage S less than 8.5%, an initial modulus of at least 17 g/d, a modulus ratio less than 3, and a retraction less than 1%.
A bobbin having wound thereon a flat nylon 66 yarn having a substantially constant cross sectional configuration along its length, a shrinkage S less than 8.5%, an initial modulus greater than 15 g/d, a 10% modulus less than 22 g/d, and a retraction less than 1%.
A bobbin having wound thereon a flat nylon 66 yarn having a substantially constant cross sectional configuration along its length, a shrinkage S less than 8.5%, a 10% modulus less than 22 g/d, a final modulus greater than 7.5 g/d, a modulus ratio less than 3, and a retraction less than 1%.
Dependencies are inferred from the claim text.