Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1984-06-29
1985-10-01
Lindsay, Robert
Glass manufacturing
Processes
Forming product or preform from molten glass
65 12, 65DIG4, 65356, C03B 3709
Patent
active
045443920
ABSTRACT:
The present invention is an auxiliary heated bushing block for a fiber forming furnace. The bushing block fits below an opening in the bottom of a forehearth of a glass melting furnace. A non-circular opening through the bushing block allows molten material to flow into a fiber forming bushing. Electrical resistance heater elements protrude through the ends of the bushing block into the non-circular opening into contact with the molten material. Each electrical resistance heater element has associated with it a separate adjustable power supply to provide individually variable power to each electrical resistance heater element. By varying the power settings of each power supply, the molten material as it flows through the non-circular opening of the bushing block can be selectively thermally conditioned.
REFERENCES:
patent: 2186718 (1940-01-01), Ferguson
patent: 3912477 (1975-10-01), Brady et al.
patent: 4161396 (1979-07-01), Greene et al.
patent: 4270941 (1981-06-01), Babbitt
patent: 4285711 (1981-08-01), Willis
patent: 4325721 (1982-04-01), Jensen
patent: 4402724 (1983-09-01), Weisenburger et al.
Champion Ronald E.
Hudgens Ronald C.
Lindsay Robert
Owens-Corning Fiberglass Corporation
Pacella Patrick P.
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