Apparatus for minimizing drawn filament diameter variation

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

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18/556, 49/8

D01D 5/08 (2006.01) C03B 37/014 (2006.01) C03B 37/02 (2006.01) C03B 37/027 (2006.01) C03B 37/029 (2006.01)

Patent

CA 1104312

APPARATUS FOR MINIMIZING DRAWN FILAMENT DIAMETER VARIATION Abstract of the Disclosure 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.

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