Methods for prolonging the useful life of a graphite element in

Details Methods for prolonging the useful life of a graphite element in Methods for prolonging the useful life of a graphite element in

1981-08-31

1983-10-04

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 12, 65 13, 65 29, 219412, 373 27, 373123, C03B 3707, C03B 3701

Patent

active

044076665

ABSTRACT:
An optical fiber drawing furnace includes a graphite element of generally cylindrical shape with a reduced central cross-sectional configuration having a flange at opposite ends thereof and having an axial hole therethrough including a central internal element chamber for receiving a glass preform, means for water cooling the flanges, and means for applying electric power across the flanges to resistively heat the reduced cross-sectional configuration and, hence, the central internal element chamber so that an optical fiber can be drawn from the preform. The invention relates to prolonging the useful life of the graphite element by suitable methods and apparatus. The water used for cooling the flanges can be regulated to a temperature such as to avoid condensation of atmospheric moisture within the room (in which the furnace is located) upon the furnace. The application of electric power across the flanges can be increased and decreased at a gradual rate so as to avoid thermal shock to the graphite element.

REFERENCES:
patent: 3697241 (1972-10-01), Strickland et al.
patent: 4030901 (1977-06-01), Kaiser
patent: 4309201 (1982-01-01), Klop et al.

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