Method of toughening glass sheet by quenching

Details Method of toughening glass sheet by quenching Method of toughening glass sheet by quenching

1991-03-12

1992-05-12

Woodard, Joye L.

Glass manufacturing

Processes

Glass preform treating

65104, C08B 2704

Patent

active

051123770

ABSTRACT:
This invention relates to a method of toughening a glass sheet by heating it to a temperature above the strain point and quenching the heated glass sheet with blasts of air. The heated glass sheet is positioned between two oppositely arranged blastheads, each of which has a plurality of first nozzles and a plurality of second nozzles. The first nozzles are connected to a supply of compressed air, and the compressed air is forced to rapidly expand so as to produce a shock wave and have a first predetermined pressure at the exit of each of the first nozzles. Simultaneously, cooling air is supplied from a blower to the second nozzles so as to have a second predetermined pressure, which is higher than the first predetermined pressure, at the exit of each of the second nozzles. The difference between the second and first predetermined pressures is not more than 0.05 kg/cm.sup.2. By this method, even glass sheets thinner than 3 mm can be toughened so as to meet regulations for toughened glass sheets to be used in automobile windows without suffering from swaying under quenching and resultant deformation or distortion of the glass sheet.

REFERENCES:
patent: 4735646 (1988-04-01), Aratani et al.
patent: 4773926 (1988-09-01), Letemps et al.
patent: 4888038 (1989-12-01), Herrington et al.
patent: 4913720 (1990-04-01), Gardon

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