Method for heating glass semi-finished products above the adhesion temperature
AssigneeSchott Glas
InventorsAndreas Langsdorf, Hildegard Romer
Life of this patent
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Abstract
The invention relates to a method for heating up and shaping a preform consisting of glass or glass ceramic. According to the invention, a preform, formed using conventional methods, is heated to a temperature that is below the adhesion temperature of the gas, i.e. to below critical viscosity; in a second heating phase the preform is put into a hovering state through the supply of levitation gas; in the hovering state the preform is heated by a microwave heating apparatus to a temperature that permits its shaping; and the preform is delivered to a shaping station.
Claims6
Method for heating up and shaping a preform consisting of glass;
- the preform is produced in a conventional manner;
- the preform, in a first heating phase, is heated to a temperature that lies below the adhesion temperature of the glass while no levitation gas is supplied;
- the preform, during a second heating phase in a levitation mold is put into a hovering state through the supplying of levitation gas;
- the preform, in its hovering state, is heated by a microwave heating apparatus to a temperature that permits its shaping;
- the preform is delivered to a shaping station.
Device for heating up and shaping a preform, comprising:
- a first mold for receiving the preform;
- a heating apparatus for heating up the preform to a first temperature that is below the adhesion temperature while no levitation gas is supplied;
- a levitation mold for receiving the preform that has been previously heated in the first heating phase;
- a microwave heating apparatus associated with the levitation mold;
- shaping equipment arranged after the levitation mold with microwave heating apparatus.
Dependencies are inferred from the claim text.