Melting and vacuum refining of glass or the like and composition of sheet
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United States of America Patent
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Apr 19, 1988
Issued Date -
N/A
app pub date -
Aug 7, 1986
filing date -
Jan 2, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus are provided for refining glassy material or the like by vacuum. The material is first melted and then introduced into a vacuum chamber, preferably into space above liquid held in the chamber. Other aspects involve a two-step melting process preparatory to the vacuum refining, in which the material is initially liquefied in one stage and dissolution of particles is substantially completed in a second stage. The molten material is preferably foamed immediately upon entry into the vacuum chamber.
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