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Method for refining molten glass-making materials

  • US 3,926,607 A
  • Filed: 02/10/1975
  • Issued: 12/16/1975
  • Est. Priority Date: 02/04/1974
  • Status: Expired due to Term
First Claim
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1. A METHOD OF REFINING MOLTEN GLASSMAKING MATERIALS COMPRISING THE STEPS OF:

  • FORMING A PASSAGE BETWEEN A CYLINDRICALLY SHAPED SURFACE AND A TUBULAR STIRRING DEVICE OF ABOUT THE SAME LENGTH AS THE CYLINDRICALLY SHAPED SURFACE;

    INTRODUCING MOLTEN GLASS CONTAINING GASEOUS INCLUSIONS INTO THE PASSAGE AND DOWNWARDLY PASSING THE MOLTEN GLASS BETWEEN THE TUBULAR SURFACES;

    ROTATING AT LEAST ONE OF THE CYLINDRICAL SURFACES AT A SPEED OF BETWEEN 30 AND 810 REVOLUTIONS PER MINUTE;

    MAINTAINING THE GLASS TEMPERATURE BETWEEN 2550**F AND 2700*F;

    CONTROLLING THE RESIDENCE TIME OF MOLTEN GLASS IN THE ANNULUS TO AN EQUIVALENT FLOW RATE BETWEEN 60 AND 150 GRAMS OF MOLTEN GLASS PER HOUR AND THEREBY CAUSING GASEOUS INCLUSIONS TO COALESCE AND TO FLOW UPWARDLY IN A DIRECTION OPPOSITE TO THE DOWNWARD FLOW OF MOLTEN GLASS-FORMING MATERIAL IN THE PASSAGE;

    AND DISCHARGING MOLTEN GLASS HAVING A CONTROLLED NUMBER OF GASEOUS INCLUSIONS.

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