PROCESS AND APPARATUS FOR PRODUCING GLASS PLATE

摘要

PROBLEM TO BE SOLVED: To provide a process for producing a high-quality glass plate with high productivity by avoiding such the problem that internal strain becomes larger as the size of the glass plate is made larger.

SOLUTION: The process for producing the glass plate C includes: a forming step in which molten glass A is fed to a trough 10 disposed in a forming furnace 11 and the molten glass A is caused to flow down from the trough 10 through a conveyance passage 18 extending vertically and to thereby stretch/form the glass A into a platy glass ribbon B; an annealing step in which the internal strain in the glass ribbon B is removed in an annealing lehr 12; a cooling step in which the glass ribbon B is cooled to around room temperature; and a cutting step in which the glass ribbon is cut into given size. The pressure of an atmosphere surrounding the forming furnace 11 and/or the annealing lehr 12 is elevated.

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