Quasi-containerless glass formation method and apparatus

Details Quasi-containerless glass formation method and apparatus Quasi-containerless glass formation method and apparatus

1985-12-05

1987-03-31

Lindsay, Robert

Glass manufacturing

Processes

Forming product or preform from molten glass

65 13, 65134, 65136, C03B 37025

Patent

active

046540652

ABSTRACT:
Apparatus and method for forming ultrapure glass rods (13) or fibers (28) from a polycrystalline rod (11) in which the method comprises the steps of heating a selected short section of the rod in the first furnace (21) to form a molten zone of the rod, heating a second selected short section of the rod in a second furnace (19) which initially is separated from the first furnace by a very short gap to form a second molten zone of the rod which initially is contiguous with and part of the first molten zone of the rod to form a single molten zone 14, and then gradually moving the first and second furnaces apart to first form a rod (13) and then, ultimately, a fiber (28), of ultrapure glass in the increasingly widening gap forming therebetween.

REFERENCES:
patent: 3485613 (1969-12-01), Herczog et al.
patent: 4565557 (1986-01-01), Naumann et al.

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