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Silica preform production by outside vapor deposition is effected using moving groups of soot burners at different flame temperatures to deposit different layers
Silica preform production by outside vapor deposition is effected using moving groups of soot burners at different flame temperatures to deposit different layers
Production of a silica preform by deposition of superimposed silica-containing particle layers on the mantle surface of a carrier rotating about its longitudinal axis uses a group of burners oscillating parallel to this axis, the burners (9) in the rear group (23) which deposit the upper layer (6) reaching a higher flame temperature than do the burners (7) the front group (21).
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