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    • 76. 发明专利
    • HEAT-TREATED GLASS PLATE AND PRODUCTION THEREOF
    • JPH02175624A
    • 1990-07-06
    • JP33180588
    • 1988-12-28
    • ASAHI GLASS CO LTD
    • YOSHIDA TETSUYAIGA GENICHITERAO ICHIRO
    • C03B25/00C03B27/012C03B27/016C03B27/04C03B27/044
    • PURPOSE:To obtain a heat-treated glass most suitable as a window of skyscraper by heating a glass plate at a specific temperature, immediately introducing the plate into a cooling furnace having small emissivity of the inner wall surface, blowing hot air of a specific temperature on the surface of the glass and cooling the glass below the distortion temperature of the glass plate at a cooling rate slower than the spontaneous cooling in air. CONSTITUTION:A glass plate having a thickness of 6-19mm is heated at 570-660 deg.C, taken out of the heating furnace and immediately introduced into a cooling furnace having an inner surface having an emissivity of 0.1-0.3 and, at the same time, hot air of 50-400 deg.C is blown on the surface of the glass to cool the glass plate to a temperature below the distortion temperature of the glass with a cooling capacity adjusted to get the cooling rate of the glass plate to be lower than that of the spontaneous cooling rate in air. The cooling process is controlled in such a manner as to obtain the heat-treated glass plate having a sigmat of 85-200kg/cm and a sigmac/sigmat ratio of 1.5-3.0 wherein sigmat is central tensile stress and sigmac is surface compression stress of the glass plate.