Title: Melting and defecating glass or the like by vacuum defecation
Application Number: 86108895 Application Date: 1986.12.30
Publication Number: 1013571 Publication Date: 1987.09.30
Approval Pub. Date: 1991.01.02 Granted Pub. Date: 1991.01.02
International Classifi-cation: C03B5/225
Applicant(s) Name: PPG Industries Inc. Address:
Inventor(s) Name: Ronald Lee Sveininger
Attorney & Agent: DUAN CHENGEN XU RUXUN
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.
Time: 5
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