Patent ID: 8322161
Filing Date: 2012-12-04
Classification: C03B,Y02P

Abstract:
1. A process for producing a glass sheet, the process comprising: a forming step of down-drawing a molten glass into a sheet-like glass ribbon, in which the molten glass is fed to a forming trough arranged in a forming furnace and the molten glass is caused to flow down from the forming trough through a conveyance passage extending vertically; an annealing step of removing an internal strain in the sheet-like glass ribbon in an annealing furnace disposed below the forming furnace; a cooling step of cooling the sheet-like glass ribbon to around room temperature in a cooling chamber that is disposed below the annealing furnace, communicates with the annealing furnace via the conveyance passage, and has a gas exhausting passage through which air in the cooling chamber is exhausted to outside of the cooling chamber, thereby restricting a maximum value of the internal strain of the glass sheet to 1.0 MPa or less; and a cutting step of cutting the sheet-like glass ribbon into a given size to an outside to form the glass sheet.