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Process and apparatus to melt and refine the material vitreo; process of merger with remains of raw materials and refining the mass in a merger with; glass product sheet and flat glass transparent
Process and apparatus to melt and refine the material vitreo; process of merger with remains of raw materials and refining the mass in a merger with; glass product sheet and flat glass transparent
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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