Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1982-06-23
1984-04-03
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 12, 65 13, C03B 37025
Patent
active
044405561
ABSTRACT:
In order to provide a high power heat source having a very clean and invariable heat flux, a ring plasma is induced in a heating zone of a plasma torch including a plurality of coaxial tubular elements and the optical fiber is drawn through a channel passing axially through the center of the plasma torch and of the ring-shaped plasma. In this manner the preform from which the fiber is drawn can be placed in close proximity to the induced plasma without exposure to non-symmetrical temperature variations. Cooling gas passes through the heating zone either in an annular stream surrounding the plasma or in an annular stream passing through the center of the plasma around the preform and the fiber being drawn, or both. The heating zone is protected from environmental disturbances by an extension of the outer tubular element of the plasma torch which surrounds the heating zone. The plasma is induced by an RF source in an undisturbed stream of a plasma-forming gaseous medium, such as argon or a mixture of argon with oxygen, which flows through the heating zone.
REFERENCES:
patent: Re30883 (1982-03-01), Rau et al.
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patent: 3990873 (1976-11-01), Knetzlstorfer
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patent: 4383843 (1983-05-01), Iyengar
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Checcacci et al., "R.F. Induction Furnace for . . . Drawing", Electronics Letters, vol. 12, No. 11, May 27, 1976, pp. 265-266.
Nath Dilip K.
Oh Shin M.
Pureza Pablo C.
Fisher Richard V.
International Telephone and Telegraph Corporation
O'Halloran John T.
Ruzek Peter R.
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