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Method of adjusting glass temperature in a forehearth

  • US 4,029,488 A
  • Filed: 08/02/1976
  • Issued: 06/14/1977
  • Est. Priority Date: 08/02/1976
  • Status: Expired due to Term
First Claim
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1. The method of delivering molten glass at a predetermined gob temperature from a melting furnace to an orificed forehearth bowl, comprising:

  • 1. in the forehearth in close proximity to the entry of molten glass from said furnace, abruptly reducing the temperature of a lower central portion of the glass stream to a temperature approximately equal to but above the predetermined gob temperature;

    2. immediately following the temperature reduction, mechanically blending and homogenizing the glass as it moves downstream;

    3. continually applying a mild Joule-effect, below-surface conditioning heat to said stream for a period of time at least twice the length of time said stream was subjected to abrupt temperature reduction and permitting downward temperature adjustment to substantially the predetermined gob withdrawal temperature accompanied by temperature normalization throughout the stream; and

    4. discharging the glass through the orifice of said bowl in the form of a series of uniform gobs.

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