Glass manufacturing – Means shaping preform from granular material with fusion means
Patent
1987-05-27
1989-01-31
Schor, Kenneth M.
Glass manufacturing
Means shaping preform from granular material with fusion means
65 182, 65157, 118724, 239422, 239424, 2394245, 422129, C03B 37018
Patent
active
048013226
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 deposed 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 multi-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.
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Nakahara Motohiro
Shibata Shuichi
Suda Hiroyuki
Nippon Telegraph & Telephone Corporation
Schor Kenneth M.
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