Thermal treatment of glass sheets
US4221579A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1979 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Apr 19, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B27/052
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A glass sheet is thermally treated, for example thermally toughened, by heating the glass sheet, and lowering the sheet into a gas-fluidized bed of particulate material which is at a glass-treatment temperature, for example quenching temperature. Extraction of gas from a localized upper region of the bed is commenced prior to the lowering of the hot glass sheet into the bed in order to produce gradually an unfluidized static packed condition of the material in that upper region of the bed. The glass sheet is lowered into the bed at a time after commencement of gas extraction which is such that the lower edge of the sheet passes through that upper region prior to full attainment of the static packed condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.