Film embossing process
US4226825A · kind A · utility
4Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1978 |
| Grant date | Oct 7, 1980 |
| Priority date | — |
| Expiry date | Dec 21, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C71/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A film embossing process of roughening a lateral edge of a thermo-plastic film by mechanically deforming said lateral edge. The lateral edge is subjected to the film embossing process at a temperature of from the glass transition temperature (Tg) of the film to the temperature of (tg+60.degree. C.). Subsequently the film is subjected to heat treatment at a temperature higher than the temperature of said film embossing process by at least 10.degree. C. to 30.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.