Forming process for light gauge polymer sheet material
US4294640A · kind A · utility
5Cited by
10References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1979 |
| Grant date | Oct 13, 1981 |
| Priority date | — |
| Expiry date | Dec 12, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/103
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for cold-forming light gauge polymer sheet material by application of localized heat to the area of the fold. In the manufacture of Lexan polycarbonate flexible magnetic disk jackets, heat is applied to the folded corner by a heater bar generally maintained uniformly at 375.degree. F. The heater bar contacts the folded Lexan polycarbonate edge in a U-shaped trough having planar side walls generally perpendicular to a planar bottom wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.