Apparatus for minimizing drawn filament diameter variation

Details Apparatus for minimizing drawn filament diameter variation Apparatus for minimizing drawn filament diameter variation

1977-12-05

1978-11-21

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 2, 65 32, 425 66, C03B 3702

Patent

active

041264363

ABSTRACT:
An apparatus is disclosed for drawing glass optical waveguide filaments having minimal diameter variation. A draw blank is supported within an elongated, heated, tubular muffle which heats the blank to its draw temperature. Gas is supplied to that end of the muffle opposite that from which the filament is drawn. A cylindrically shaped member at least 10 cm long is disposed adjacent to the end of the blank opposite the filament to form with the inner wall of the muffle a thin, cylindrically-shaped channel through which the gas must flow. The gas stream is thus uniformly heated at the time that it reaches the root of the filament so that diameter variations due to gas turbulence are minimized.

REFERENCES:
patent: 2958899 (1960-11-01), Stein et al.
patent: 3737292 (1973-06-01), Keck et al.
patent: 3890127 (1975-06-01), Siegmund
patent: 4030901 (1977-06-01), Kaiser

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