Glass manufacturing – Processes – Fining or homogenizing molten glass
Patent
1975-05-01
1976-09-07
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
Fining or homogenizing molten glass
13 6, 65136, 65DIG4, C03B 516
Patent
active
039791971
ABSTRACT:
An electrically-heated, glass-melting furnace has an infrared-absorbing material located along the side walls to intercept energy from the heat source in the pool of molten glass in the furnace and thereby enable the side walls to be at a lower temperature. The furnace is heated electrically by means of electrodes immersed in the molten glass and with this arrangement, the glass and the side walls of the furnace tend to be at higher temperatures than furnaces utilizing fuel-fired burners firing above the molten glass. The higher wall temperatures result in a shorter life for the furnace, requiring more frequent, costly rebuilding. To overcome this, a material capable of absorbing infrared rays is supplied to the furnace along the side walls thereof. This material forms a curtain disposed between the side walls and the heat source to intercept the infrared rays and thereby reduce the operating temperatures of the side walls. The absorbing material eventually becomes mixed with the molten glass in the furnace and is discharged therewith. However, the material constitutes such a small percentage of the overall discharged glass that it has no significant effect upon the characteristics thereof.
REFERENCES:
patent: 1794863 (1931-03-01), Northrup
patent: 2440187 (1948-04-01), Silverberg
patent: 2863932 (1958-12-01), Gell et al.
patent: 3486874 (1969-12-01), Rough
Dziegielewski Greg
Hudgens Ronald C.
Lindsay, Jr. Robert L.
Overman John W.
Owens-Corning Fiberglas Corporation
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