Spin draw process of making partially oriented yarns from polytrimethylene terephthalate
US6740270B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2001 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Aug 20, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/62
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
This invention is a spin draw process for making partially oriented yarn from polytrimethylene terephthalate (PTT) which comprises the steps of:(a) extruding and spinning PTT in forming a monofilament or multifilament yarn therefrom,(b) heating the yarn by contacting it with a first pair of godets moving at a speed in and at a temperature set to give a yarn temperature above the glass transition temperature and less than the cold crystallization temperature of PTT,(c) drawing the yarn between the first godet pair and a second pair of godets moving at a speed and a temperature of from 45 to 120° C. and having a draw ratio of 0.7 to 3.0, and(d) winding the yarns at the speed of 1 to 15% less than that of the second godet pair at a yarn temperature less than the glass transition temperature of PTT yarn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.