Method for producing a glass tube with a cross section of a noncircular form by reshaping

US10654741B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Markus Riedl · Mitterteich, DE
• Jonas Zeitler · Mitterteich, DE
• Bernd Hoppe · Ingelheim am Rhein, DE
• Wolfgang Kreger · Leonberg, DE
• Gottfried Haas · Tirschenreuth, DE

Key dates

• Filing date: Feb 20, 2018
• Grant date: May 19, 2020
• Expiry date: Sep 24, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/57
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for producing glass tubes with a cross section of a noncircular form by reshaping. This method includes at least providing a glass tube, heating the glass tube, providing at least one reshaping tool, which has a forming body with a forming area for reshaping the heated glass tube, the forming body including at least one open-porous material, setting a gas pressure in the interior of the reshaping tool lower than 90 kPa, so that a negative pressure is produced on the forming area, and reshaping the heated glass tube by applying a compressive force perpendicularly to the longitudinal axis of the glass tube, the compressive force being generated by the reshaping tool and being applied to the outer surface of the glass tube, and the outer surface of the glass tube being fixed by the negative pressure.