Apparatus for manufacturing stria-free, bubble-free and homogene

Details Apparatus for manufacturing stria-free, bubble-free and homogene Apparatus for manufacturing stria-free, bubble-free and homogene

1986-04-04

1987-05-19

Schor, Kenneth M.

Glass manufacturing

Sheet casting and receiving means

65227, 65335, 65355, 6537413, 6537415, 65DIG4, 373 30, C03B 1902, C03B 502

Patent

active

046664955

ABSTRACT:
A method of manufacturing practically stria-free, bubble-free, and homogeneous quartz-glass plates of any desired configuration and with a surface area that exceeds the cross-section of the full circular quartz-glass cylinder that is employed as a starting material. The cylinder is continuously lowered into a furnace shell flooded with an inert gas, in which it is heated to a flowing temperature in the range of 1700.degree. to 1900.degree. C. until some of the quartz-glass flows off into a graphite crucible. The crucible is preferably clad with zirconium-oxide.

REFERENCES:
patent: 1439410 (1922-12-01), Gray
patent: 1603221 (1926-10-01), Thomson
patent: 2924046 (1960-02-01), Cummins
patent: 3025146 (1962-03-01), Runyan
patent: 3717450 (1973-02-01), Loughridge

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