Process and apparatus for producing glass sheet
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United States of America Patent
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Dec 4, 2012
Grant Date -
Oct 28, 2010
app pub date -
Dec 10, 2008
filing date -
Dec 25, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A process produces a glass sheet. The process includes 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. The process also includes removing an internal strain in the glass ribbon in an annealing furnace, cooling the glass ribbon to around room temperature, and cutting the glass ribbon in a given size, in which a pressure in an outside atmosphere of the forming furnace and/or the annealing furnace is elevated.
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