摘要:
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 TBeh above the transformation temperature TG, wherein the annular region is adjacent to the glass container bottom; maintaining the treatment temperature TBeh for a certain time period; and cooling the glass container to room temperature.
摘要:
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 109 to 104 dPa·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 1013 dPa·s, and deforming the heated starting glass by action of an external force until the predefined geometry of the glass article is obtained.
摘要:
An apparatus is provided that heats the glass of a primary glass product to be formed. The apparatus includes a laser that emits light at a wavelength for which the glass of the primary glass product is at most partly transparent, such that the light is absorbed at least partially in the glass. The apparatus also includes a mold having a forming mandrel having a thermally stable ceramic material, at least in the region that forms the contact surface with the glass during the forming process.
摘要:
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.
摘要:
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.
摘要:
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 TBeh above the transformation temperature TG, wherein the annular region is adjacent to the glass container bottom; maintaining the treatment temperature TBeh for a certain time period; and cooling the glass container to room temperature.
摘要:
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.
摘要:
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.
摘要:
The disclosure relates to a method for producing, without a mold, a shaped glass article having a predefined geometry. For this purpose a method is provided for producing a shaped glass article without using a mold, which method comprises at least the steps of: providing a starting glass; supporting the starting glass; heating a portion of the starting glass so that in this portion a predetermined spatial viscosity distribution of the starting glass is obtained from 109 to 104 dPa·s, in particular from 104 to 108 dPa·s, and so that at the points where the starting glass is supported a predetermined spatial viscosity distribution of the starting glass does not fall below 1013 dPa·s, wherein the heating is accomplished using at least one laser beam; and deforming the heated starting glass by action of an external force until the predefined geometry of the glass article is obtained, and the portion is raised or lowered with respect to the surrounding regions so that a local elevation or depression is obtained.