Patent · US Active

Method and apparatus for producing a tube of glass

US9957185B2 · kind B2 · utility

0Cited by

17References

13Claims

0Family size

Assignee

HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

Boris Gromann · Aschaffenburg, DE
Matthias Söhn · Speyer, DE
Alexander Blumenau · Jena, DE

Key dates

Filing date	Apr 27, 2016
Grant date	May 1, 2018
Priority date	—
Expiry date	Apr 27, 2036

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B23/07
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method and apparatus are provided for producing a tube of glass by zonewise heating and softening of a hollow cylinder by a movable heating zone while rotating about its rotation axis. The glass tube is continuously formed by radial expansion of the softened region under action of centrifugal force and/or internal overpressure applied in the hollow-cylinder bore. The method and apparatus make it possible to deform the hollow cylinder in a single or a small number of forming steps into a glass tube having a larger outer diameter and high dimensional accuracy by determining a circumferential position at which the wall thickness is comparatively small, and during heating and softening of the rotating hollow cylinder a coolant is dispensed from a coolant source onto the deformation zone only when or predominantly when the circumferential position having the comparatively small wall thickness passes the coolant source.

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