Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1978-03-17
1979-08-21
Kellogg, Arthur D.
Glass manufacturing
Processes
Forming product or preform from molten glass
65110, 65DIG7, 65DIG16, C03B 3702, C03C 2502
Patent
active
041652240
ABSTRACT:
In the manufacture of silica optical fibers a tube having an internal coating of a volatile dopant is locally heated by a hot zone repeatedly traversed along its length to promote shrinkage and finally collapse of the tube bore. During the shrinkage prior to the final collapse traversal a gas flow of oxygen and a halide of the volatile dopant is maintained through the tube in order firstly to provide a small overpressure to ensure circularity in the shrinkage and secondly to compensate for the tendency for dopant to be lost by volatilization.
REFERENCES:
"Preparation of Low Loss Optical Fibers Using Simultaneous Vapor Phase Deposition and Fusion" by MacChesney et al., pp. 6--40 to 6--45 of 10th International Congress on Glass, 1974, Bell Laboratories, Murray Hill, N.J., 07974, USA.
Harrison Andrew P.
Irven John
Goldman Stephen B.
International Standard Electric Corporation
Kellogg Arthur D.
O'Halloran John T.
Van Der Sluys Peter C.
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