Yarn treatment process
Abstract
Abstract A PROCESS FOR REDUCING THE THERMAL SHRINKAGE OF FULLY DRAWN, HIGH TENACITY, MULTIFILAMENT POLYMERIC SYNTHETIC YARNS HAVING SUBSTANTIAL THERMAL SHRINKAGE, BY A MULTIPLE HEAT TREATMENT OF A RUNNING LENGTH THEREOF AT SUBSTNAITALLY CONSTANT TEMPERATURES EACH BELOW THE STICKING TEMPERATURE OF THE YARN, WHICH HEAT TREATMENT CONSISTS ESSENTIALLY OF THE STEPS OF (1) FIRST HEATING THR YARN UNIFORMLY FOR AT LEAST ABOUT 10 SECONDS TO AT LEAST 190*C. WHILE CONTINUOUSLY OVERFEEDING IT A CONSTANT AMOUNT SO THAT THE YARN SHRINKS TO A LENGTH BETWEEN 90% AND 98% OF ITS STARTING FULLY DRAWN LENGTH, (2) THEN HEATING THE YARN UNIFORMLY FOR AT LEAST ABOUT 10 SECONDS TO AT LEAST 190*C. WHILE CONTINUOUSLY UNDERFEEDING IT A CONSTANT AMOUNT SO THAT THE YARN STRETCHES TO ABOUT 104-110% OF ITS STARTING FULLY DRAWN LENGTH, AND (3) THEREAFTER HEATING THE YARN UNIFORMLY FOR AT LEAST ABOUT 10 SECONDS TO AT LEAST 190*C. WHILE CONTINUOUSLY OVERFEEDING IT A CONSTANT AMOUNT SO THAT THE YARN SHRINKS FROM ITS STRETCHED LENGTH TO ABOUT 98-105% OF ITS STARTING FULLY DRAWN LENGTH.
Inventors
- 👤 James E Fowler
Bibliographic Details
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |