Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1992-06-11
1994-06-07
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 111, 65 301, C03B 37025
Patent
active
053186125
ABSTRACT:
According to the invention, a hollow silica bar (2) is produced with a thick wall and high geometrical precision, the bar is then cleaned and an oven (24) is used able to heat the silica to its melting temperature and with respect to which the bar is moved so as to embody an external thermic glazing of the bar, an internal vapor phase depositing a vitreous coating in this bar by making circulate inside it a mixture of suitable gaseous constituents, this coating being intended for the subsequent formation of the core of the optical fibers, and an area contraction of the bar, the various temperatures of the bar required to embody these operations being obtained by varying the temperature of the oven or speed of the bar with respect to the oven.
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Hardy Isabelle
Le Noane Georges
France Telecom Etablissement (Autonome de Droit Public)
Lindsay Robert L.
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