Patent ID: 9617181
Date: 2017-04-11
CPC Classifications: C03B

Claim:
1. A method of heating a glass sheet for tempering, said method comprising; conveying the glass sheet on top of rollers in a roller-hearth furnace, heating the glass sheet in the roller-hearth furnace to a transfer temperature at which the glass sheet is transferred into an air support furnace within which the glass sheet, while resting on an air cushion, is carried on an air support table, and heating the glass sheet in the air support furnace to a tempering temperature, wherein the transfer temperature is not lower than 620° C. and not higher than 675° C.; and the tempering temperature is not lower than 650° C. and not higher than 720° C.; and wherein the roller-hearth furnace is at least partially oscillating and the air support furnace is continuous.