Heat strengthened glass
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United States of America Patent
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Jul 26, 1988
Grant Date -
N/A
app pub date -
Jun 26, 1987
filing date -
Jun 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of producing heat strengthened glass in which the glass is heated to a temperature above its strain point and is then cooled while horizontally supported. Discontinuous support is provided for the glass as it is cooled by intermittent regional contact with the lower surface of the glass, whereby any pattern of iridescence resulting from heat transfer between the lower glass surface and the support is free of prominent continuous features. A glass treatment furnace for producing heat strengthened glass, has horizontal glass-supporting rollers and cooling-flow supply means in the vicinity of those rollers, the bearing surface of each roller comprising discontinuous bearing elements which provide intermittent regional support contact with the lower surface of the glass.
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