Glass manufacturing – Processes – Glass preform treating
Patent
1991-01-30
1992-07-07
Woodard, Joye L.
Glass manufacturing
Processes
Glass preform treating
65115, C03B 2700
Patent
active
051279320
ABSTRACT:
The invention relates to a method of toughening a glass sheet by heating it to a temperature above the strain point and quenching the heat glass sheet while it is advancing horizontally by blowing cooling gas jets onto each face of the glass sheet from an array of nozzles. In advance of such quenching, the heated glass is preliminarily cooled to some extent so as to cool the glass sheet at a relatively high rate in substantially parallel stripe-like regions, which make an angle greater than 45.degree. and not greater than 135.degree. with the direction of advance of the glass sheet, than in other regions. As a result, relatively high toughening occurs in the stripe-like regions. Preferably the preliminary cooling is made only in a central area of the glass sheet. The preliminary cooling has the effect of compensating a toughening pattern attributed to the unidirectional movement of the glass sheet under quenching, so that the toughened glass sheet is satisfactory in the manner of fragmentation. By this method even glass sheets thinner than 3.5 mm can be toughened so as to fully meet the fracture requirements for toughened glass sheets to be used as automobile side or rear windows.
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Central Glass Company Limited
Woodard Joye L.
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