Method for reducing the amount of gas bubbles on the surface of a glass tube and apparatus therefore
AssigneeSchott AG
InventorsRainer Eichholz, Jens Ahrens, Thomas Pfeiffer
Life of this patent
Estimating the term…
Abstract
A glass tube forming apparatus includes a tube forming body configured to receive a flow of molten glass from a glass melt, the molten glass being withdrawn from the tube forming body in the form of a glass tube, the tube forming body being covered at least partly with a metallic layer; and at least one metallic electrode mounted in the glass melt in spaced relation to the tube forming body. The tube forming body is connected electrically with the at least one electrode.
Claims16
A glass tube forming apparatus, comprising:
- a tube forming body configured to receive a flow of molten glass from a glass melt, wherein the molten glass is withdrawn from the tube forming body in the form of a glass tube, wherein the tube forming body is covered at least partly with a metallic layer;
- and
- at least one metallic electrode mounted in the glass melt in spaced relation to the tube forming body, wherein the tube forming body is connected electrically with the at least one electrode.
A method for reducing an amount of gas bubbles on a contact surface of a glass tube, the method comprising:
- providing a tube forming body configured to receive a flow of molten glass from a glass melt, wherein the tube forming body is covered at least partly with a metallic layer;
- providing at least one metallic electrode mounted in the glass melt in spaced relation to the tube forming body;
- providing an electrical connection between the tube forming body and the at least one electrode;
- generating a potential drop between the tube forming body and the at least one electrode to cause a direct current;
- and
- withdrawing the molten glass from the tube forming body in the form of a glass tube as the direct current flows between the tube forming body and the at least one electrode.
A glass tube having an aggregated air line length of less than 0.10 m per 1.0 m tube length on a contact surface of the glass tube, wherein the aggregated air line length is defined as a sum of lengths of closed air lines having a length>15 mm and open air lines having a length>2 mm.
Dependencies are inferred from the claim text.