Glass manufacturing – Processes – Glass preform treating
Patent
1988-09-29
1990-04-03
Kellogg, Arthur
Glass manufacturing
Processes
Glass preform treating
65104, 65119, C03B 2704
Patent
active
049137204
ABSTRACT:
A glass sheet tempering method and resultant glass sheet are disclosed as being provided by modulated quenching that initially cools the oppositely facing surfaces of a conveyed glass sheet at a first cooling station (14) with a first rate of heat transfer for a finite time to cool the surfaces from tempering temperature to below the strain point without cooling the center of the glass sheet below the strain point. Thereafter the oppositely facing surfaces of the conveyed glass sheet are cooled within a second cooling station (15) at a second rate of heat transfer less than the first rate to initially cool the center of the glass sheet below the strain point without corresponding surface cooling, and thereafter further cools the center and the sruface. The second rate of heat transfer is of a magnitude so that the surface temperature initially increases without going back substantially above the strain point prior to subsequently again cooling. The modulated quenching provides a relative large ratio of surface compression to center tension without excessive magnitudes of stress.
REFERENCES:
patent: 3301650 (1967-01-01), Ward
patent: 4004901 (1977-01-01), Starr
patent: 4204845 (1980-05-01), Shields et al.
patent: 4236909 (1980-12-01), Thomas et al.
patent: 4566893 (1986-01-01), Hopkins et al.
Bueno Alejandro G.
Gardon Robert
Shetterly Donivan M.
Glasstech, Inc.
Kellogg Arthur
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