Method of manufacturing a multi-component glass cylindrical part in the form of a tube and/or rod
US5618325A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1994 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Jun 28, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2203/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method of manufacturing a multi-component glass cylindrical part comprising the operations of providing a vertical cylindrical cavity lined with porous membranes whose inside dimensions are very slightly larger than those of the glass cylindrical part and in which can slide a cylindrical pedestal, providing a seed mass of the glass on the pedestal, heating the seed mass until it melts, injecting a gas continuously into the porous membranes to form and maintain a layer of gas between the porous membranes and the molten seed mass preventing any contact between the molten seed mass and the porous membranes, feeding the molten seed mass from the top of the cavity by continuously dispensing a powder made up of the components of the glass, varying the composition of the powder as the cylindrical part is formed, so that the glass cylindrical part has a composition that varies in the longitudinal direction, and lowering the pedestal as the cylindrical part is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.