Forming process for light gauge polymer sheet material
US4443398A · kind A · utility
4Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1981 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Jul 27, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1051
- 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 edge by a heating element generally maintained uniformly at 375.degree. F. The heating element contacts the folded Lexan polycarbonate edge in a U-shaped trough having planar sidewalls generally perpendicular to a planar bottom wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.