Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Patent
1993-01-27
1994-09-27
Chin, Peter
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
65 251, 6537415, 651822, 65DIG16, 65 173, 65413, 65412, C03B 1909
Patent
active
053504330
ABSTRACT:
In a method of manufacturing a cylindrical part from glass, especially but not exclusively fluorinated glass, a vertical cylindrical cavity is lined with a porous material and its inside dimensions are a few tens of microns greater than those of the part. A cylindrical pedestal constituting a support for the part slides in the cavity. An initial seed mass constituted from the glass is provided on the pedestal. The seed mass is heated until it melts and a gas is injected permanently into the porous material in order to maintain between them and the molten seed mass a layer of gas a few tens of microns thick to prevent any contact. The molten seed mass is fed continuously from the top of the cavity with the powder constituents of the glass and the pedestal is lowered as the cylindrical part is formed from the seed mass.
REFERENCES:
patent: 3298808 (1967-01-01), Macks
patent: 4617041 (1986-10-01), Meerman
Webster's Third New International Dictionary, Merriam-Webster, Inc., Springfield, MA (1981), p. 574.
ALCATEL N.V.
Chin Peter
Hoffmann John
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