Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1992-02-07
1993-04-20
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 312, 65900, 65DIG16, C03B 37027
Patent
active
052038998
ABSTRACT:
A glass preform which is used for fabricating an optical fiber, has substantially no bubbles therein and contains sufficient amount of fluorine is produced by a method comprising steps of: forming a porous glass soot body from a glass-forming raw material, removing trapped gas and water from pores of the soot body by heating the soot body under pressure lower than several ten Torr. at a temperature at which the soot body is not vitrified, filling the pores of the soot body with a gas containing SiF.sub.4 and uniformly adding fluorine to the soot body, vitrifying the fluorine-added soot body into a transparent glass body, boring said transparent glass body to form a bore therein, and inserting a highly pure quartz rod in said bore to form a glass preform, or a method forming a glass soot composite body having a core portion consisting of a solid glass and a peripheral portion consisting of a porous glass mass, removing trapped gas and water from pores of the soot composite body by heating the soot composite body under a pressure lower than several ten Torr. at a temperature at which the porous glass mass is not vitrified, filling the pores in the porous glass mass of the soot composite body with a gas containing SiF.sub.4 and uniformly adding fluorine to the soot glass mass, and vitrifying the fluorine-added soot glass mass into a transparent glass mass to form a glass preform.
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Ishiguro Yoichi
Kakuzen Hideo
Kyoto Michihisa
Urano Akira
Lindsay Robert L.
Sumitomo Electric Industries Ltd.
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