Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – With measuring – controlling – sensing – programming – timing,...
Patent
1995-10-17
1997-10-14
Hoffmann, John
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
With measuring, controlling, sensing, programming, timing,...
65 31, 65429, 46 24, 46 80, C03B 37012
Patent
active
056767242
ABSTRACT:
A method of improving the symmetry of a cylindrical silica tube to be used in making a preform having a circular outside surface eccentric to a circular inside surface thereby providing a varying tube thickness throughout the circumference of the tube which includes the following steps. The first step is locating a longitudinal generator line of the cylindrical tube at a greatest thickness of the tube at a given circumferential point on the tube, and while preventing the tube from rotating, etching in at least one pass the inside of the tube with a gas capable of decomposing silica, while heating the outside of the tube along that longitudinal generator line.
REFERENCES:
patent: 4259406 (1981-03-01), Borrelli
patent: 4415404 (1983-11-01), Riegl
patent: 4493721 (1985-01-01), Auwenda
patent: 5127929 (1992-07-01), Gunther et al.
patent: 5152816 (1992-10-01), Berkey
patent: 5192350 (1993-03-01), Le Sergent
Patent Abstracts of Japan, vol. 11, No. 381 (C-464), Dec. 12, 1987 corresponding to JP-A-62 153136 (Fujikura, Ltd) Jul. 8, 1987.
Barre Gilles
Le Sergent Christian
Alcatel Fibres Optques
Hoffmann John
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