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Flat nylon 66 yarn having a soft hand, and process for making same
| Details |
Inventors: Bromley, James E.; McNamara, Michael M.; Mowe, Wayne T.;
Assignee: Monsanto Company (St. Louis, MO)
Primary Examiner: Cannon; J.C.
Assistant Examiner:
Attorney, Agent or Firm: Corley; Kelly O.
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%. |
|
DETAILED DESCRIPTION We claim: 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 positive stress index .
varies.
, and a retraction less than 1%.
2.
The bobbin defined in claim 1, wherein said stress index .
varies.
exceeds 15.
3.
The bobbin defined in claim 2, wherein said yarn has a 10% modulus less than 17 g/d.
4.
The bobbin defined in claim 1, wherein said yarn has a modulus ratio less than 3.
5.
The bobbin defined in claim 1, wherein said yarn has a shrinkage S between 1 and 6%.
6.
The bobbin defined in claim 1, wherein said yarn has a Uster unevenness of less than 0.
5% U.
7.
The bobbin defined in claim 1, wherein said yarn has an elongation at break between 25 and 60%.
8.
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%.
9.
The bobbin defined in claim 8, wherein said yarn has a final modulus of at least 7.
5 g/d.
10.
The bobbin defined in claim 8, wherein said yarn has an initial modulus of at least 21 g/d.
11.
The bobbin defined in claim 8, wherein said yarn has a shrinkage S between 1 and 6%.
12.
The bobbin defined in claim 8, wherein said yarn has a Uster unevenness of less than 0.
5% U.
13.
The bobbin defined in claim 8, wherein said yarn has an elongation at break between 25 and 60%.
14.
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%.
15.
The bobbin defined in claim 14, wherein said 10% modulus is less than 17 g/d.
16.
The yarn defined in claim 14, wherein said yarn has a Uster unevenness of less than 0.
5% U.
17
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Manufacturing Materials 
