Furnace having different electrode immersions to control convect

Details Furnace having different electrode immersions to control convect Furnace having different electrode immersions to control convect

1976-11-01

1979-03-06

Envall, Jr., R. N.

C03B 502

Patent

active

041432320

ABSTRACT:
A furnace for melting thermoplastic material, such as glass, includes a vertical furnace with electrodes at different levels immersed to different depths in the molten material. The convection currents and size, shape and stability of the fusion zone are controlled by changing the amount of power and the depth of immersion of the electrodes at different levels. For example, the electrodes in one of the lower tiers extend closer to the center of the furnace to produce a central upward convection current, to prevent an unstable fusion zone due to temperature gradients from wall to center, and to decrease the temperature near the furnace wall. For glasses with steep temperature-resistivity relationships and/or high infra-red absorption characteristics, the advantages of using differently immersed electrodes are even more significant.

REFERENCES:
patent: 2921106 (1960-01-01), Arbeit
patent: 2993079 (1961-07-01), Augsburger
patent: 3742111 (1973-06-01), Pieper

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