Method of producing dealkalized sheet glass

Details Method of producing dealkalized sheet glass Method of producing dealkalized sheet glass

1992-12-04

1994-03-08

Lindsay, Robert L.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 301, 65 601, C03C 1500

Patent

active

052923541

ABSTRACT:
A method of producing dealkalized sheet glass in which sheet glass is dealkalized in stages. The method includes dealkalizing sheet glass in a first stage by exposing the sheet glass to contact with a first dealkalizing medium including at least one acid gas for a period of at least 1 minute while the sheet glass is at a temperature above 400.degree. C.; and further dealkalizing the sheet glass in a subsequent stage by exposing the sheet glass after the first stage to contact with a second dealkalizing medium including at least one acid gas for a period of at least 3 minutes while the sheet glass is at a temperature which is at least 50.degree. C. below one of the temperature of the sheet glass during the first stage and the minimum temperature of the sheet glass during the first stage, and ranges between 400.degree. C. and 250.degree. C.

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