False twist-crimped polyester yarns production
US3936999A · kind A · utility
10Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1973 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Dec 19, 1993 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02G1/0286
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A false twist-crimped polyester yarn having a density (d) of 1.3800.ltoreq.d.ltoreq.1.3970 (g/cm.sup.3) and total percentage crimp (TC) of TC 30% is produced by false twisting a polyester multi-filament having a birefringence (.DELTA.n) of 0.030.ltoreq..DELTA.n.ltoreq.0.145 while heat setting the filament in the twisted state at 160.degree. to 210.degree. at a draft (dr) which satisfies the following equation: EQU -150(.DELTA.n) + 17.ltoreq.dr.ltoreq.0.9 .times. 10.sup.4 (.DELTA.n.sup.2)-29 .times. 10.sup.2 (.DELTA.n)+248.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.