Glass manufacturing – Processes – Utilizing parting or lubricating layer
Patent
1977-07-28
1978-09-19
Kellogg, Arthur D.
Glass manufacturing
Processes
Utilizing parting or lubricating layer
65107, 65287, C03B 2302
Patent
active
041150902
ABSTRACT:
A method and apparatus for shaping glass sheets by gravity sagging on essentially continuous-surfaced molds having gas vents. The molds are usable in a gas fired kiln wherein dirt and dust particles are likely to be lodged onto the upward facing shaping surface of the mold and impress marks on the heat-softened glass sheet as it is being shaped by gravity sagging. The gist of the present invention is to blow gas between the bottom surface of the glass and upward facing shaping surface of the continuous-surfaced mold as the glass sags toward the shaping surface so as to remove the dust and dirt particles as late as possible during the glass sheet shaping operation and still permit the applied gas to escape from between the shaping surface and the glass sheet bent into conformity therewith. The applied gas also hardens the lower glass surface.
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patent: 3960535 (1976-06-01), Hamilton et al.
patent: 3992181 (1976-11-01), Frank
Kellogg Arthur D.
Mates Edward I.
Millman Dennis G.
PPG Industries Inc.
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