| 摘要 |
The invention relates to a method for heating up and shaping a preform consisting of glass or glass ceramic. According to the invention, such a method comprises the following process steps: 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 gas, i.e. to below the critical viscosity; the preform, during a second heating phase, 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.
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