Process for production of polyester threads
US3998921A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1973 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Dec 11, 1993 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D10/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention is related to a process for the production of improved, low shrinkage, highly oriented polyester threads which comprises melt spinning a polyester thread, stretching said thread in hot water and shrinking said thread from 3 to 22 % in hot air at temperatures of from 5.degree. to 40.degree. C below the melting point of the polyester over a period of from 3 to 30 seconds. The improved service properties of monofilaments produced in this way are reflected in an increase in the ultimate tensile strength coupled with an increase in elongation, in a shrinkage of less than 1% on boiling, in a heat-included shrinkage of at most 10% at a temperature of 195.degree. C (exposed for 30 minutes in air) and in a very high 2nd moment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.