Method and apparatus for the production of flat, transparent vit

Details Method and apparatus for the production of flat, transparent vit Method and apparatus for the production of flat, transparent vit

1982-09-13

1984-10-02

Envall, Jr., Roy N.

Industrial electric heating furnaces

Glass furnace device

373122, 65136, C03B 502

Patent

active

044752040

ABSTRACT:
Flat, transparent slabs of vitreous silica of optical quality are produced by melting granular starting material in a vacuum by means of an electrical heating system. The starting material is melted while sustaining a heat flow from the top to the bottom of the crucible. The bottom of the crucible is made permeable to gases. The heat isolation power of the crucible wall increases from the bottom to the top of the crucible.

REFERENCES:
patent: 1572894 (1926-02-01), Little
patent: 3142717 (1964-07-01), Appleman et al.

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