| 摘要 |
PROBLEM TO BE SOLVED: To get a preform in a cold state finished by a molding machine by heating it at a molding temperature without exposing it to adhesion danger. SOLUTION: This invention relates to a method for heating and finish processing preform glass or preform glass ceramics. The method based on this invention is composed of following working processes: the preform is manufactured by a conventional method, the preform is heated to a temperature below adhesion temperature of the glass or below a temperature where critical viscosity is reached, at a second heating stage the preform in a hovering state is heated to a temperature where deformation can be generated by a microwave heater which feeds a levitation gas in a hovering die to make the preform in a hovering state, then the preform is transferred to a molding station.
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