Process to mold precision glass articles

Details Process to mold precision glass articles Process to mold precision glass articles

1986-04-10

1988-03-29

Schor, Kenneth M.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65104, 65275, 65 64, 425808, C03B 1100

Patent

active

047341181

ABSTRACT:
The present invention is directed to a four-step process for molding glass articles of high precision and excellent surface figure. A glass preform having an overall geometry closely approximating that of the desired final product is placed into a mold, the mold and preform are brought to a temperature at which the glass exhibits a viscosity between 10.sup.8 -10.sup.12 poises, a load is applied to shape the glass into conformity with the mold, and thereafter the glass shape is removed from the mold at a temperature above the transformation range of the glass and annealed.

REFERENCES:
patent: 1332724 (1920-03-01), Hill
patent: 2728106 (1955-12-01), Herman et al.
patent: 3794704 (1974-02-01), Strong
patent: 3833347 (1974-09-01), Augle
patent: 3900328 (1975-08-01), Parsons
patent: 4012215 (1977-03-01), Schwab et al.
patent: 4199342 (1980-04-01), Mestre
patent: 4348484 (1982-09-01), Joormann et al.
patent: 4481023 (1984-11-01), Merechal
Derwent Publication Week 42-1985, pp. 3 and 6.

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