Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1978-04-28
1979-01-09
Kellogg, Arthur D.
Glass manufacturing
Processes
Forming product or preform from molten glass
65121, 65145, 65178, 65253, C03B 1308
Patent
active
041336666
ABSTRACT:
At least two differently colored components of glass are heated to a molten, viscous state and then combined in a channel shaped forehearth to form a confluent of molten glass in which the starting components remain in discrete domains, delineated by abrupt color transitions at the interfaces between such domains. The confluent flows by gravity to a discharge end of the forehearth, at which the molten glass is fed between a pair of forming rollers which press it into a continuous, elongate sheet of variegated glass. While flowing toward the discharge end of the forehearth, the molten glass is subjected to controlled, limited stirring to break up relatively large domains of homogeneous color into a multitude of smaller randomly dispersed domains characterized by streaks, swirls and waves of individually identifiable colors. A first, coarse stirring operation is performed at a location substantially upstream of the discharge end of the forehearth and consists of reciprocating a stirring paddle in a cross-channel path and thus transverse to the direction of flow of the molten glass. Downstream therefrom, gas bubbles are injected into the confluent, from the bottom of the forehearth channel, and these bubbles migrate upwardly through the viscous, molten glass, agitating, stirring and thus further dispersing the individual color domains. Finally, a second, fine stirring operation is carried out immediately adjacent the discharge end of the forehearth by manipulating another stirring paddle in a non-synchronous mixing pattern, including up and down and transverse stirring strokes which impart a final, esthetic randomness to the color domains in the glass. Adjacent the discharge end of the forehearth, the flow of molten glass is partially obstructed by a shallow weir, over which the glass flows to reach the forming rollers, and behind which a reservoir of molten glass develops to provide a source of supplemental quantities of glass, which is used as needed to compensate for transient shortfalls in the quantity of glass reaching the forming rollers.
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Ek Roger B.
Rhodes Jerry D.
Kellogg Arthur D.
Spectrum Glass Company, Inc.
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