Process for producing a cylindrical component made of glass by elongation

US9221712B2 · kind B2 · utility

Assignees

• HERAEUS QUARZGLAS GMBH & CO. KG · DE
• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Thomas R. Bernard · Baton Rouge, US
• Harald Hain · Alzenau, DE
• Thomas Bogdahn · Karlstein, DE
• Oliver Ganz · Könnern, DE

Key dates

• Filing date: Oct 17, 2012
• Grant date: Dec 29, 2015
• Expiry date: Dec 18, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2205/72
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for using a temperature control loop in order to further develop process control during elongation of a cylindrical preform such that a component strand with high dimensional accuracy can be drawn even in the presence of temperature-effective defects during the elongation process: (a) the continuous measurement of a first temperature value, Ttop, at an upper measuring point on the surface of the cylindrical preform; (b) the continuous measurement of a second temperature value, Tbottom, at a lower measuring point; (c) calculation of a temperature distribution in the region between the measuring points Ttop and Tbottom, and determination of a modelled deformation temperature, Tmodel, using an algorithmic model taking with first and the second temperature values as model input parameters, and the modelled deformation temperature, Tmodel, as a regulating variable and the heating-zone temperature Toven as a manipulated variable for the temperature-control loop.