Schott Ag

Carl-zeiss-stiftung

Schott Spezialglas Gmbh

Erich Fischer

Erhard Dick

Roland Fuchs

Markus Riedl

Andreas Langsdorf

Ulrich Lange

Christian Kunert

Wolfgang Münch

Robert Rühl

Anton Winkelmann

Markus Riedel

A device for the production of a glass rod is provided. The device has a Danner blowpipe constructed to avoid problems attributed to different heat expansion coefficients of the participating materials. The Danner blowpipe has an outer metal jacket surrounding a ceramic body and defines a supply end and a discharge end of the blowpipe. A clamping plate is provided at both the supply and discharge ends. The clamping plate on the discharge end is rigidly joined with a shaft and engages the outer metal jacket at the discharge end. The clamping plate on the supply end is joined in an axially displaceable manner on the shaft, which is rigidly joined with a pressure plate against displacement in an axial direction. A pressure spring is disposed between the pressure plate and the clamping plate on the supply end to urge the plates away from one another.

Device for producing a glass rod

The invention concerns a device for supporting a horizontal guided, continuous glass strand;

Device for supporting a horizontal guided glass strand

The double-walled noble metal duct () for conducting a glass melt has an outer noble metal pipe () and an inner noble metal pipe () extending within the outer pipe, so that an inner space () is formed within the inner pipe and an intermediate space () is formed between the inner pipe () and the outer pipe (). The intermediate space is completely filled with glass melt when the double-walled noble metal duct conducts the glass melt, when the outer pipe () has an exhaust vent (). The outer pipe () also has a bottom outlet () communicating with the intermediate space for removal of oxygen bubbles formed on the outer wall. The noble metal duct can be used in glass conditioning and in the manufacture of glass articles that are devoid of polyvalent ions.

Noble metal duct for conducting a glass melt and method for conducting a glass melt

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.

Method of preventing schileren formation in a glass melt with same

The invention relates to a process for the production of internally-hardened glass tubes, in which in a tube-drawing process for the production of glass tubes that is known in the art, a coated drawing tool, for example in the process according to Danner a coated mandrel or in the process according to Vello or in A-drawing process a coated needle, is used, whose coating releases coating material upon contact with the inside surface of the tube that is produced and accumulates on the inside glass surface. The chemical resistance is increased by this internal hardening. The invention also relates to devices for implementing this process and uses of the tubes that are produced according to these processes.

Growing community of inventors

Mitterteich, Germany

Erich Fischer