Process for making poly(trimethylene terephthalate) yarn
US6109015A · kind A · utility
16Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Jul 7, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S57/908
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a method of producing poly(trimethylene terephthalate) yarn from PTT chip which has been extruded through a spinneret into filaments and coated, the coated filaments are passed between an unheated feed roll and a tension roll to tension them without causing permanent stretching, and then are passed from the tension roll to a heated draw roll to draw the filaments in a single draw step to a draw ratio of 1.25 to 4.0 and to heat them to a temperature between their glass transition temperature and their crystallization temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.