Method for producing a tube of quartz glass by elongating a hollow cylinder of quartz glass
US8061162B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 2006 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | Feb 23, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/57
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a known method for producing a tube of quartz glass by elongating a hollow cylinder of quartz glass having an outer diameter AD, said cylinder is continuously supplied to a heating zone with a vertically oriented heating tube having an inner diameter d, with the proviso that the diameter ratio d/AD is set to a value ranging from 1.02 to 1.7. The hollow cylinder is softened therein zonewise, and a tubular strand is drawn off from the softened region and shortened to obtain the tube. Starting therefrom, in order to optimize the dimensional stability of the quartz glass tube obtained, it is suggested according to the invention that the heating zone should have a length L which is set such that the ratio L/d is smaller than 0.9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.