Ppg Industries, Inc.

Kwang J Won

George A Pecoraro

Joseph M Matesa

Henry M Demarest, Jr

Glass or the like is melted by liquefying batch materials in a first stage by means of radiant heating, and further advancing the melting process in a second stage where the melt is heated by induction heating. Another aspect of the invention provides a residence zone at the exit of the induction heating stage to aid elimination of gaseous inclusions.

Method and apparatus for inductively heating molten glass or the like

Molten material is heated by submerged combustion of hydrogen with oxygen so that the product of combustion injected into the melt is low in volume and consists essentially of water vapor which is relatively soluble in a material such as molten glass. Preferred embodiments involve liquefying the batch materials in a first stage and subjecting the liquefied materials to submerged combustion in a second stage.

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Murraysville, PA, United States of America

Kwang J Won