Method of adjusting glass temperature in a forehearth

Details Method of adjusting glass temperature in a forehearth Method of adjusting glass temperature in a forehearth

1976-08-02

1977-06-14

Kellogg, Arthur D.

Glass manufacturing

Processes

Fining or homogenizing molten glass

65135, C03B 502

Patent

active

040294889

ABSTRACT:
The temperature of molten glass conveyed by means of a forehearth between a melting furnace and a discharge orifice in a bowl remote from the furnace is controlled and adjusted thermally by a method that includes an abrupt bottom-zone temperature reduction step in the immediate proximity of the entry of the glass from the furnace to the forehearth cooling zone to a temperature approximately equal to but above a predetermined gob temperature; next the step of blending and homogenizing the cooling glass as it enters the conditioning zone in its downstream movement; and while avoiding above-surface heating during conditioning, subjecting the glass stream only to mild Joule-effect, below-surface heating applied in a controlled manner to accomplish temperature normalization and homogeneity throughout the stream whereupon the glass is delivered to the discharge orifice at a specified temperature.

REFERENCES:
patent: 1953023 (1934-03-01), Mulholland
patent: 3198618 (1965-08-01), Penberthy
patent: 3326655 (1967-06-01), Penberthy
patent: 3498779 (1970-03-01), Hathaway

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