Glass manufacturing – Processes – Glass preform treating
Patent
1982-02-10
1983-08-23
Kellogg, Arthur D.
Glass manufacturing
Processes
Glass preform treating
65115, 65348, 65351, C03B 2704
Patent
active
044001940
ABSTRACT:
Heat strengthened glass is treated to have a break pattern that permits the fractured glass sheet to be retained within an installation frame by moving a glass sheet through a heating area, force cooling the side portions of the moving sheet while cooling the intermediate portions of the sheet at a lesser rate to establish a temperature gradient between the side portions and the intermediate portion, and subsequently applying quenching medium to the entire moving sheet. The temperature gradient in the sheet is achieved by a plurality of baffles, e.g. plates having an imperforate center portion and apertured or slotted end portions and facilities movable relative to quenching nozzles to control passage of quenching medium through the slotted end portions of the baffles to control the temperature gradient imparted to the glass sheet. The movable facilities also permit tempering of glass sheets of varying transverse dimensions.
REFERENCES:
patent: 2093040 (1937-09-01), Eckert
patent: 2188401 (1940-01-01), Crowley
patent: 3251670 (1966-05-01), Acloque
patent: 3304166 (1967-02-01), Bolland
patent: 3363936 (1968-01-01), Baker
patent: 3364006 (1968-01-01), Newell et al.
patent: 3396001 (1968-08-01), Baker
patent: 3847580 (1974-11-01), Misson
patent: 4236909 (1980-12-01), Thomas et al.
Kellogg Arthur D.
Lepiane Donald Carl
Mates Edward I.
PPG Industries Inc.
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