Casting core/clad glass preforms method and apparatus

Details Casting core/clad glass preforms method and apparatus Casting core/clad glass preforms method and apparatus

1990-09-10

1992-04-21

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 313, 65 13, C03B 37027

Patent

active

051064006

ABSTRACT:
Disclosed is a method of forming a glass preform from core and cladding glasses having low liquidus viscosities and narrow working ranges. A tube of liquid core glass is vertically situated in a vessel of liquid cladding glass. The tube extends to the bottom of the vessel where there is a stopper for preventing leakage of core glass. While both core and cladding glasses are at a temperature just above the liquidus temperature, the vessel is lowered into a coolant bath, thereby causing core glass to flow into the region vacated by the tube. The rate of withdrawing the tube from the vessel is sufficiently slow to provide laminar flow and yet fast enough to permit the resultant liquid core/clad composite to freeze before mixing occurs.

REFERENCES:
patent: 2992517 (1961-07-01), Hicks
patent: 4217123 (1980-08-01), Titchmarsh
patent: 4308045 (1981-12-01), Miller
patent: 4453962 (1984-06-01), Harada et al.
patent: 4897100 (1990-01-01), Nice
patent: 4898603 (1990-02-01), Hutta

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