Method of producing shaped foamed-glass articles
US4552577A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 5, 1983 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Apr 5, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B19/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention is directed to a method and apparatus for forming shaped foamed-glass articles. Glass particles are introduced to a pressure vessel in the presence of water. A pressure is applied to the pressure vessel sufficient to permit entrapment of water during sintering and sufficient to prevent foaming at processing temperatures. The temperature of the glass is increased to cause the glass to sinter and entrap water. The temperature of the glass is then increased to its fining temperature (T.sub.F) for a sufficient time to fine the glass. The temperature of the glass is reduced to its pressure release temperature (T.sub.PR). The pressure on the glass containing water is then reduced such as by extrusion to cause controlled foaming of the glass to occur. The glass is then cooled preferably by annealing to form the shaped foamed-glass article, typically pipe insulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.