Fiber-drawing furnace for drawing down an optical-fiber preform

Details Fiber-drawing furnace for drawing down an optical-fiber preform Fiber-drawing furnace for drawing down an optical-fiber preform

1997-12-29

1998-12-08

Hoang, Tu Ba

Industrial electric heating furnaces

Induction furnace device

Coreless

373111, 373139, 65499, 219651, H05B 626

Patent

active

058480935

ABSTRACT:
The fiber-drawing furnace includes a graphite tube positioned vertically, heated by induction, and subjected internally to an inert atmosphere, said tube internally defining a fiber-drawing chamber. In the furnace said graphite tube is a double-walled tube having an inner wall and an outer wall, its inner wall is porous and separates the fiber-drawing chamber from a peripheral chamber defined between the walls and subjected to a flow of inert gas which diffuses through said porous wall into said fiber-drawing chamber. Application to drawing down an optical-fiber preform.

REFERENCES:
patent: 4142063 (1979-02-01), Boniort et al.
patent: 4643890 (1987-02-01), Schramm
patent: 5308947 (1994-05-01), Fleming, Jr.
patent: 5410567 (1995-04-01), Brundage et al.
Patent Abstracts of Japan, vol. 18, No. 568 (C-1266), 31 Oct. 1994 corresponding to JP 06 206735 A (Sumitomo Electric Ind. Ltd) dated 26 Jul. 1994.
Abstract, DE 30 25 680 A (Siemens AG).

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