Patent · US Active

Quartz glass tube and method of manufacturing the same

US11919794B2 · kind B2 · utility

0Cited by

5References

19Claims

0Family size

Assignee

HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

Matthias Söhn · Speyer, DE
Boris Gromann · Aschaffenburg, DE
Eduard Visnow · Hanau, DE

Key dates

Filing date	Mar 29, 2022
Grant date	Mar 5, 2024
Priority date	—
Expiry date	May 6, 2042

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B2215/40
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

In a method of manufacturing a tube of quartz glass by molding a hollow cylinder having a wall thickness of at least 20 mm, the cylinder is continuously fed under rotation about a rotational axis into a heating zone at a relative feed rate VC, softened and radially expanded under the effect of a gas pressure. A tube strand is continuously formed and is withdrawn at a withdrawal rate VT. In order to mold thick-walled initial hollow cylinders of quartz glass into tubes with larger diameter, the gas pressure is used as an actuating variable of a diameter regulation for the tube outer diameter or for a geometrical correlated parameter thereof, and in a pressure build-up phase the gas pressure is gradually increased from a lower initial value to a higher final value, and that the following applies to the ratio of VC and VT:VT=VC±0.2·VC.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.