Method and apparatus for forming tempered sheet glass with a pyrolytic film in a continuous process
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United States of America Patent
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Dec 23, 1980
Grant Date -
N/A
app pub date -
Feb 9, 1979
filing date -
Feb 9, 1979
priority date (Note) -
Expired
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Abstract
A method and apparatus for filming and tempering a pre-cut glass sheet in a continuous process. The glass sheet is heated initially to a temperature sufficient for pyrolysis. The heated glass is sprayed with a coating composition which reacts with the glass to form a metal oxide film on its surface. The filmed glass is re-heated to both restore the heat lost by spraying and to bring its temperature to a level sufficient for tempering. The glass sheet is then tempered by subjecting it to rapid cooling. The method can be modified to include a secondary spraying wherein after the glass is first sprayed it is re-heated as in the initial step and then re-sprayed before completing the process. Apparatus for carrying out the above described method is also disclosed.
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