Process for transversely stretching polyethylene terephthalate film
US4238443A · kind A · utility
16Cited by
13References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Aug 9, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process is disclosed for transversely stretching amorphous polyethylene terephthalate film wherein the temperature is adjusted to be substantially uniform across the web before stretching, heat is removed during stretching, and after stretching, the temperature is 1 to 15C..degree. lower and is uniform across the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.