Method and apparatus for bending and tempering a glass sheet

Details Method and apparatus for bending and tempering a glass sheet Method and apparatus for bending and tempering a glass sheet

1992-06-25

1994-04-26

Woodard, Joye L.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65 29, 65107, 65160, 65268, 65273, 65274, C03B 23025

Patent

active

053063244

ABSTRACT:
The invention relates to a method and apparatus for bending and tempering a glass sheet. A glass sheet is supported by one and the same ring mould (3) throughout all its working operations. Following the preheating of a glass sheet from a temperature of about 500.degree. C., its heating to a final bending and tempering temperature is effected at a high output and rate of speed. For example, on 4 mm thick glass, this final heating is performed within a period of time of 15-25 s. Therefore, the temperature of bending station is 800.degree.-1000.degree. C. Since rapidly heating glass bends quickly, the bending flexure or temperature of glass is monitored and the glass is advanced to tempering as soon as a predetermined bending flexure or temperature is reached.

REFERENCES:
patent: 3249415 (1966-05-01), McMaster et al.
patent: 4497645 (1985-02-01), Peltonen
patent: 4755204 (1988-07-01), Boardman et al.
patent: 5009691 (1991-04-01), Aratani

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