Method of tempering glass sheet by air quenching

Details Method of tempering glass sheet by air quenching Method of tempering glass sheet by air quenching

1986-12-24

1988-04-05

Kellogg, Arthur

Glass manufacturing

Processes

Glass preform treating

65104, C03B 2704

Patent

active

047356464

ABSTRACT:
The invention relates to a method of tempering a glass sheet by first suitably heating the glass sheet and quenching the heated glass sheet by directing jets of air onto both surfaces of the glass sheet from two sets of nozzles respectively protruding from oppositely disposed two air chambers. At the start of quenching, each air chamber is suddenly allowed to communicate with a source of compressed air kept at a predetermined first pressure in the range from 2 to 8 kg/cm.sup.2 (gauge pressure) such that a rapid drop from the first pressure to a predetermined second pressure in the range from 0.05 to 0.5 kg/cm.sup.2 (gauge pressure) takes place as the compressed air expands into the air chamber and such that substantially the whole length of the air chamber and the nozzles serves as a sort of shock wave tube. Consequently, the air jets arriving at the glass sheet surfaces at the initial stage of quenching are very high in kinetic energy and heat dissipating power. By this method even glass sheets thinner than 3 mm can be tempered so as to meet the current regulations on tempered glass sheets for use as automobile side or rear windows.

REFERENCES:
patent: 3226215 (1965-12-01), Beattie et al.
patent: 4519829 (1985-05-01), Spittka et al.
patent: 4578102 (1986-03-01), Colmon et al.

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