Method of making a fiber preform including a surface treatment t

Details Method of making a fiber preform including a surface treatment t Method of making a fiber preform including a surface treatment t

1996-02-13

1999-10-26

Hoffmann, John

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

65421, 65433, 65113, 65112, C03B 2902

Patent

active

059707500

ABSTRACT:
The invention relates to a method of performing surface treatment on a preform manufactured in an installation for manufacturing or building up preforms having supporting cores, the installation including at least rotation means having a horizontal axis of rotation and two mounting points between which the supporting core of the preform to be manufactured or built up is mounted, plasma-torch and material-supply means disposed radially relative to the supporting core and mounted to move in axial translation relative to and parallel to the supporting core so as to make the preform around the supporting core, the preform being manufactured or built up by effecting successive passes with the plasma torch while material is being supplied. According to the invention, after the plasma torch passes with material being supplied have been effected, and/or after the preform has been separated, at least one pass is effected automatically and without cooling the preform, which pass is effected with a plasma torch and without material being supplied so as sinter deposits comprising condensation soot.

REFERENCES:
patent: 4689212 (1987-08-01), Manfield
patent: 4935045 (1990-06-01), Yamauchi
patent: 4975102 (1990-12-01), Edahiro
patent: 5000771 (1991-03-01), Fleming
patent: 5211730 (1993-05-01), Kanamori
patent: 5522007 (1996-05-01), Drouart

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