Process for cryogenically quenching glass sheets
US5938808A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1998 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Jul 31, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B27/026
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for quenching a heated glass sheet is performed by apparatus (26) that includes a pair of quench units (28) between which the glass sheet is located with each quench unit having nozzles (34) for directing cryogenic flows (36) including a liquid (42) toward the oppositely facing surfaces (38) of the glass sheet so that the liquid completely vaporizes before penetrating the gas boundary layer (40) on each surface of the glass sheet. The cryogenic flows (36) can be initially completely liquid (42) or can be a two phase as the liquid (42) and a gas (44) with the latter preferably being done by spraying the two phase cryogenic flows as liquid droplets and the gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.