Patent · US Expired

Method of preventing schileren formation in a glass melt with same

US7000431B2 · kind B2 · utility

0Cited by

1References

2Claims

0Family size

Assignee

Schott AG · DE

Inventors

Erhard Dick · Mitterteich, DE
Erich Fischer · Altdorf, DE
Roland Fuchs · Mitterteich, DE
Markus Riedl · Mitterteich, DE

Key dates

Filing date	May 15, 2002
Grant date	Feb 21, 2006
Priority date	—
Expiry date	Apr 13, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B17/04
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The sleeve-type glass melt agitator has a rotatable cylindrical sleeve provided with outwardly protruding vane elements and through-going openings in its outer cylindrical surface to stir the glass melt when the sleeve is rotated. The sleeve type agitator is arranged vertically in a glass melt feed channel in a glass melt feed system for making glass tubes or pipes according to the Vello or down-drawn process. During formation of glass tubes or pipes from the glass melt the sleeve-type agitator is rotated as the glass melt flows downward to prevent formation of schlieren in the glass melt, which causes glass material losses.

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