Method of making perforated films
US4511520A · kind A · utility
21Cited by
6References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1982 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Jul 28, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24273
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A perforated plastic film is produced by forming a pattern of light absorbing material (e.g., in dot and/or circular forms) on the film and subjecting the printed film to radiant energy from a light source in order to melt the film areas covered with the light absorbing material, thus producing a corresponding plurality of perforations in the plastic film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.