Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – With measuring – controlling – sensing – programming – timing,...
Patent
1994-03-02
1997-12-02
Jones, W. Gary
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
With measuring, controlling, sensing, programming, timing,...
65427, C03B 37012
Patent
active
056931158
ABSTRACT:
In order to provide an improved process for the production of a glass preform for an optical fiber which includes substantially no bubble formation therein and also has a substantially uniform shape, the present invention provides a process for the production of a glass preform which is at least partially formed from silica. In particular, a body is formed on a rod by depositing fine glass particles thereon, preferably by the vapor phase reactions, and heating the body to vitrify under a reduced atmosphere or a vacuumed atmosphere so that the glass preform is produced. According to this process, the heating includes a first heating step of degassing the body at a first heating temperature, a second heating step of shrinking the body at a second heating temperature which is higher than the first heating temperature and which is lower than a third heating temperature, and a third heating step of vitrifying the shrunken body at the third temperature which corresponds to a vitrification temperature of the fine glass particles so as to produce the glass preform.
REFERENCES:
patent: 4789389 (1988-12-01), Schermerhorn
patent: 4842628 (1989-06-01), Kreutzer
patent: 5022904 (1991-06-01), Ishiguro
patent: 5236482 (1993-08-01), Danzuka et al.
patent: 5330548 (1994-07-01), Danzuka
Danzuka Toshio
Hoshino Sumio
Ito Masumi
Ohga Yuichi
Tsuchiya Ichiro
Hoffmann John
Jones W. Gary
Sumitomo Electric Industries Ltd.
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