| 摘要 |
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.
|
