Process for producing lines of weakness in the protective backing of an adhesive laminate
US4356375A · kind A · utility
54Cited by
5References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1980 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Jul 10, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2035/0838
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process and apparatus for forming a line of weakness in the protective backing of an adhesive laminate is disclosed. The process is performed by generating a laser beam of sufficient energy to vaporize at least a portion of the protective backing of an adhesive laminate. The laser beam is focused in a focal line extending across the protective backing for a time sufficient for vaporizing at least a portion of the protective backing. At least a portion of the protective backing is vaporized with the laser beam to a depth sufficient for forming a line of weakness in the protective backing along the focal line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.