Schott Ag

Georg Haselhorst

Andreas Ortner

Fabian Wagner

Bernd Hoppe

Ulrich Lange

Andreas Habeck

Frank Buellesfeld

Volker Seibert

Volker Plapper

Robert Frost

Klaus Gerstner

Martin Spier

Thomas Sadowsky

Oliver Mühlke

Matthias WÖLFINGER

Helga GÖTZ

Markus Vollmer

A method for thermally treating an annular region of an inner surface of a glass container produced from a borosilicate glass tube is provided. The annular region is disposed at a tubular portion of the glass container and is disposed adjacent to a glass container bottom. The method includes: forming the glass container bottom from the glass tube; heating the annular region of the inner surface of the tubular portion to a treatment temperature Tabove the transformation temperature T, wherein the annular region is adjacent to the glass container bottom; maintaining the treatment temperature Tfor a certain time period; and cooling the glass container to room temperature.

Apparatus and method for thermally treating an annular region of an inner surface of a glass container produced from a borosilicate glass tube

A method is provided for separating a portion from a sheet-like glass or glass ceramic element along an intended separation line to divide the element into the portion and a main part. The method includes producing filamentary damages a volume of the glass or glass ceramic element adjacently aligned along the separation line, the filamentary damages are produced by laser pulses of a laser, the glass or glass ceramic element comprises a material that is transparent for the laser pulses; displacing incidence points of the laser pulses on a surface of the glass or glass ceramic element thereof along the separation line; and subjecting the material of the glass or glass ceramic element located in a region of the portion to a phase transition so that the material contracts to detach the portion from the main part at the adjacently aligned filamentary damages along the separation line, while the main part remains intact as a whole.

Method for laser-assisted separation of a portion from a sheet-like glass or glass ceramic element

A method is provided for preparing transparent workpieces for separation. The method includes generating aligned filament formations extending transversely through the workpiece along an intended breaking line using ultra-short laser pulses.

Separation of transparent workpieces

A method for controlling the thickness of a glass ribbon and an article produced thereby are provided. The method includes: providing a glass ribbon by drawing from a melt or redrawing from a preform; predefining a nominal thickness of the glass ribbon; determining the thickness of the glass ribbon over its entire net width; determining at least one deviation of the thickness of the glass ribbon from the predefined nominal thickness; identifying the area of the thickness deviation in the glass ribbon; and heating the area of the at least one thickness deviation in the glass ribbon using a laser, so that the glass ribbon attains the predefined thickness.

Method for controlling the thickness of a substrate

A method for producing, without a mold, a shaped glass article having a predefined geometry is provided. The method includes providing a starting glass, supporting the starting glass, heating a portion of the starting glass so that in the portion a predetermined spatial viscosity distribution of the starting glass is obtained from 10to 10dPa&#xb7;s and so that at points where the starting glass is supported a predetermined spatial viscosity distribution of the starting glass does not fall below 10dPa&#xb7;s, and deforming the heated starting glass by action of an external force until the predefined geometry of the glass article is obtained.

Shaped glass article having a predefined geometry produced without using a mold, method and use of the same

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Schmitten, Germany

Georg Haselhorst