Method for manufacturing float glass, and float glass
View Patent ↗The present invention provides a tin alloy bath for a float bath, an apparatus for manufacturing a float glass, a method for manufacturing a float glass that can provide a high quality float glass in which defects due to coagulation and falling of a volatile tin component have been suppressed, and a float glass manufactured using those. The above-mentioned tin alloy bath for a float bath is a molten metal bath to be placed in the float bath for supplying molten glass to a liquid surface of the molten metal bath, thereby forming into a glass ribbon, and includes 1 mass % or more of copper with the remainder being unavoidable impurities and tin.
1. A method for manufacturing a float glass, comprising: supplying molten glass to a liquid surface of a molten metal bath placed in a float bath, thereby forming into a glass ribbon; lifting the glass ribbon from the liquid surface of the molten metal bath, followed by annealing and cutting to obtain a float glass, wherein
the float glass is alkali-free glass,
the molten metal bath is a tin alloy bath for a float bath, which comprises 1 mass % or more and 40 mass % or less of copper with the remainder being unavoidable impurities and tin,
a proportion of SO 3 in the molten glass is 0.1 mass % or less, and
a temperature of a region at which the glass ribbon is lifted from the liquid surface of the molten metal bath in the float bath is 700° C. or higher.
2. The method for manufacturing a float glass according to claim 1 , wherein an Al 2 O 3 content in the alkali-free glass is from 10.5 to 24 mass %.
3. The method for manufacturing a float glass according to claim 1 , wherein the molten metal bath contains 30 to 40 mass % of copper.