Method and apparatus for discharging glass from a melting furnac

Details Method and apparatus for discharging glass from a melting furnac Method and apparatus for discharging glass from a melting furnac

1979-09-27

1983-09-06

Kellogg, Arthur D.

Glass manufacturing

Processes

Discharging molten glass downwardly through orifice

65 70, 65 75, 65324, 65326, C03B 526, C03B 708

Patent

active

044027249

ABSTRACT:
A method and apparatus for periodically discharging batches of a glass melt from a ceramic glass melting furnace in which localized heating energy limitable in time is supplied to the glass melt by means of electrodes in the furnace, the furnace being provided at its bottom with an induction heatable outlet member of ceramic material presenting a vertically oriented outlet passage for discharge of such batches, the furnace being operated to cause the outlet passage to be closed by a plug of the glass when no discharge is to take place, in which such plug is melted for discharging a batch of the glass melt via the outlet passage by preheating the outlet member and the glass plug by induction heating up to a preheating temperature which is below the melting temperature of the glass and above which the rate of increase of the electrical conductivity of the glass plug as a function of increasing temperature is greater than that of the ceramic material of the outlet member, and then further heating the plug, while retaining the induction heating power by means of resistance heating in which only the glass plug and the melt in the furnace serve as resistances, until the plug becomes almost liquid and molten and is suddenly pushed out of the outlet passage by the hydrostatic pressure of the glass melt thereabove.

REFERENCES:
patent: 1680543 (1928-08-01), Howard
patent: 1853842 (1932-04-01), Bates et al.
patent: 2186718 (1940-01-01), Ferguson
patent: 3078695 (1963-02-01), Kozak et al.

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