Glass manufacturing – Molten glass dispensing means – Discharge orifice below melt level
Patent
1975-09-04
1977-04-12
Bashore, S. Leon
Glass manufacturing
Molten glass dispensing means
Discharge orifice below melt level
13 6, 65134, C03B 526
Patent
active
040172945
ABSTRACT:
A two-stage orifice outlet is provided for an electric furnace. The structure defining the inner orifice adjacent the interior of the furnace through which molten material passes in its initial stages of withdrawal from the furnace is made of a refractory metal to withstand the high temperatures present within the furnace and this refractory metal must be protected from the oxidizing effects of air. The outer structure defining the outer orifice is made from a more oxidation resistant material and acts as a shield to prevent the oxidation of the refractory metal inner orifice. The outer orifice is maintained below a temperature at which it will undergo rapid deterioration by the use of cooling means. The outlet described above is operated without injecting neutral or reducing gases into the area surrounding the furnace outlet as was required by prior art furnaces of this type.
REFERENCES:
patent: 2190296 (1940-02-01), Richardson
patent: 3160492 (1964-12-01), Chapman et al.
patent: 3216815 (1956-11-01), Hartwig
patent: 3558296 (1971-01-01), Bracken
patent: 3560188 (1971-02-01), Winzer
patent: 3634588 (1972-01-01), Steitz et al.
patent: 3912488 (1975-10-01), Sanford et al.
Chenoweth Vaughn Charles
Faulkner Duane Harold
Sanford Steve Douglas
Bashore S. Leon
Johns-Manville Corporation
Kelly Joseph J.
Krone Robert M.
Miga Frank W.
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