Method of preparing precision pressed glass object

Details Method of preparing precision pressed glass object Method of preparing precision pressed glass object

1982-07-08

1984-03-06

Fisher, Richard V.

Glass manufacturing

Processes

Sequentially forming, reheating, and working

65 65, 65102, 350417, C03B 1900, C03B 2300, C03B 2900, C03C 316

Patent

active

044352000

ABSTRACT:
Glass objects, lenses in particular, can be pressed with precision from a glass which contains 45-55 mol. % P.sub.2 O.sub.5, 15-40 mol. % BaO, 5-15 mol. % Li.sub.2 O, 5-35 mol. % PbO, 0-2 mol. % Al.sub.2 O.sub.3 and 0-6 mol. % F. A cube of glass is made from the above composition and preheated to a temperature of 20.degree.-60.degree. C. above the American softening point to obtain a polishing effect. The preheated cube is then inserted into preheated dies which are closed to form a precision pressed object of the glass.

REFERENCES:
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patent: 3485646 (1969-12-01), Junge
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patent: 3979322 (1976-09-01), Alexeev et al.
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patent: 4026714 (1977-05-01), Lewis
patent: 4108673 (1978-08-01), Toratani et al.
patent: 4285730 (1981-08-01), Sanford et al.
Leidtorp, "Vitrification and Crystallization Capacity of . . . Glasses", Izv. Akad. Nauk. SSSR, Neorg. Mater., 8(11), 1972, pp. 2053-2054.

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