Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1985-02-25
1986-10-21
Schor, Kenneth M.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 182, 65 312, C03F 37018
Patent
active
046183540
ABSTRACT:
In an optical fiber preform fabrication method having the steps of decomposing a glass raw material in a flame so that fine glass particles are produced; depositing the fine glass particles on a seed rod to form a porous preform; and consolidating the porous preform into a transparent optical fiber preform, use is made of a burner having a raw material supply orifice for supplying the glass raw material and a plurality of flame forming orifices disposed around the raw material supply orifice sequentially for forming a plurality of flames, respectively. The flame speed V.sub.k of a kth flame, the flame speed V.sub.k+1 of a (k+1)th flame surrounding outwardly of the kth flame and the flow speed Vm of the glass raw material are determined in a suitable manner. The glass raw material is supplied to the maluti-flame produced by the burner in which the kth flame is positioned rearwardly of the (k+1)th flame to synthesize the fine glass particles.
REFERENCES:
patent: 2188121 (1940-01-01), Smith
patent: 4388098 (1983-06-01), Takahashi
patent: 4428762 (1984-01-01), Andrejco
Nakahara Motohiro
Shibata Shuichi
Suda Hiroyuki
Nippon Telegraph & Telephone Public Corporation
Schor Kenneth M.
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