Method for preparing perforated film
US4978486A · kind A · utility
19Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1988 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Aug 19, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/47
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for preparing a perforated film, for use in the field of sanitary, food packaging and industrial materials, by thermally embossing an oriented polyolefin film with an embossing roll having a large number of protruding knobs and a pinch roll which presses the film against the knobs, and simultaneously taking up the resultant film at a rate not less than the processing speed of the embossing roll.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.