Device for producing a plastic sheet of high optical quality
US4925379A · kind A · utility
5Cited by
6References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Nov 14, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0026
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process and a device for producing a plastic sheet of high optical quality and including at least one layer having a base of a polyurethane exhibiting energy-absorbing properties. The polyurethane layer is obtained by extrusion followed immediately after by a finishing by a pressing at a temperature higher than the temperature of the softening point of the polyurethane layer. The finishing imparts to the sheet optical quality making it suitable for use in the production of laminated glazings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.