Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1993-04-19
1994-05-03
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 2, 65 13, 65102, C03B 37023
Patent
active
053083717
ABSTRACT:
A method of forming a fiber glass preform includes the steps of: (a) pouring a cladding glass into a mold; (b) pouring a core glass on a flat horizontal upper surface of the cladding glass so as to form a united glass body having the core glass and the cladding glass under a condition that viscosity of the cladding glass and viscosity of the core glass are adjusted to certain predetermined values respectively so that the core glass is separated from and placed on the cladding glass; (c) cooling the united glass body to solidify the same so that the cladding glass is deformed by contraction thereof so as to produce a depression at a top middle portion thereof and that the core glass is deformed so as to form a projected portion thereof to fill the depression therewith; (d) separating the united glass body into an upper portion and a lower portion comprising the projected portion of the core glass; and (e) extruding the lower portion of the united glass body so as to form the fiber glass preform.
REFERENCES:
patent: 4063914 (1977-12-01), Roeder
patent: 4253731 (1981-03-01), Anderson et al.
patent: 4898603 (1990-02-01), Hutta
patent: 5185021 (1993-02-01), Miura et. al.
Kawamoto Hiromi
Kubota Yoshinori
Nishimura Natsuya
Sakanoue Akira
Central Glass Co. Ltd.
Lindsay Robert L.
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