Process to mold precision glass articles

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

1983-07-20

1984-11-06

Schor, Kenneth M.

Glass manufacturing

Processes

Sequentially forming, reheating, and working

65104, 65106, 65117, C03B 2300

Patent

active

044810237

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: 229976 (1880-07-01), Denman
patent: 1332724 (1920-03-01), Hill
patent: 2442242 (1948-05-01), Lewis
patent: 4199342 (1980-04-01), Mestre et al.
patent: 4435200 (1984-03-01), Joormann et al.

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