초록 ▼

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 wh

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.

대표청구항 ▼

[ We claim:] [5.] A method of manufacturing an optical fiber preform in an installation for manufacturing or building up performs having supporting cores, said installation including at least rotation means having a horizontal axis of rotation and two mounting points between which a supporting core

[ We claim:] [5.] A method of manufacturing an optical fiber preform in an installation for manufacturing or building up performs having supporting cores, said installation including at least rotation means having a horizontal axis of rotation and two mounting points between which a supporting core of a perform to be manufactured or built up is mounted, at least one plasma-torch with material-supply means, disposed radially relative to said supporting core and mounted to move in axial translation relative and parallel to the supporting core so as to make said preform around said supporting core, said method comprising the steps of:effecting successive material supplying passes with said plasma torch and material supply means while supplying material to said core for formation of the preform, andautomatically performing at least one surface treatment pass over a surface of the perform by said at least one plasma torch, wherein the surface treatment is performed without supplying said material, so as to consolidate and glaze condensation soot deposits.