Process to mold precision glass articles

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

1989-12-04

1990-11-13

Schor, Kenneth M.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65 64, 65 85, 65102, 65117, 264 24, 264 27, C03B 1100, C03B 2300, C03B 2500

Patent

active

049699440

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 resulting glass article is removed from the mold at a temperature above the transformation range of the glass. The glass article is then annealed.

REFERENCES:
patent: 229976 (1880-07-01), Denman
patent: 1332724 (1920-03-01), Hill
patent: 2551311 (1951-05-01), Batchell
patent: 3900328 (1975-08-01), Parsons
patent: 4199342 (1980-04-01), Mestre
Glass Engineering Handbook, McLellan & Shand; McGraw Hill Inc., 1984, pp. 2-5, 2-6.

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