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US 5,885,315 AGranted
Method for forming glass sheets
AssigneeCorning Incorporated
InventorsAllan M. Fredholm, Claude F.M. Gille, Gilbert D. Pujol
Life of this patent
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Abstract
A glass ceramic or glass-ceramic sheet is formed by progressively reducing the thickness of the sheet by passing the sheet between successive pairs of counterrotating rollers. The average viscosity of the sheet is maintained between 5.times.10.sup.4 and 10.sup.9 P during the sheet forming operation.
Claims6
A method of forming a sheet of a glass, ceramics, or glass-ceramics material, the method comprising:
- pressing a viscous sheet of glass, ceramic, or glass-ceramic material between a plurality of pairs of counter-rotating rollers to thereby reduce the thickness of the sheet to a predetermined thickness, said thickness being progressively reduced by contact with said pairs of rollers and at least one pair of said rollers comprises rollers having a plurality of male forming members thereon to form recessed cavities on both sides of said sheet, and
- maintaining the average viscosity of the sheet between 5.times.10.sup.4 and 10.sup.9 poise during said pressing step.
Dependencies are inferred from the claim text.