Process for improving the surface finish of glass foils
US4685950A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1986 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Jan 15, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S65/05
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a process for improving the smoothness of the surfaces of foils made from thermoplastics materials, particularly glass, the foil is stretched in two directions or dimensions. In a particular method, the foil is laid on top of a first frame and subsequently heated to a temperature which lies in a temperature range within which the foil starts to soften. A second frame which is at the same temperature as that of the foil is then placed on top of the foil so that the latter is effectively clamped between the frames. The two frames and foil is then cooled. The material chosen for the frames is one having a coefficient of thermal expansion smaller than or equal to that of the material of the foil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.