Abstract: The present invention relates to a float-glass manufacturing apparatus including a float bath and a heat treatment furnace, in which the heat treatment furnace includes: a dross box including a plurality of lift-out rolls; an annealing furnace including a plurality of lehr rolls; a first partitioning part; a second partitioning part; a gas ejection nozzle; and a guide member.

Abstract: The present invention relates to a float-glass manufacturing apparatus including a float bath and a heat treatment furnace, in which the heat treatment furnace includes: a dross box including a plurality of lift-out rolls; an annealing furnace including a plurality of lehr rolls; a first partitioning part; a second partitioning part; a gas ejection nozzle; and a guide member.

Abstract: 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.

Abstract: The present invention relates to a glass sheet having a fluorine concentration at one surface larger than a fluorine concentration at the other surface, the surfaces being opposite to each other in a thickness direction, in which the following Formula (1) is satisfied and the amount of fluorine contained in the glass is more than 0.23 mol %·?m and 21 mol %·?m or less on a depth-direction profile by secondary ion mass spectrometry (SIMS) in which a horizontal axis expresses depth and a vertical axis expresses fluorine concentration (mol %). The fluorine concentration is an average fluorine concentration (mol %) by SIMS in the depth of from 1 to 24 ?m. 0.1??F/?H2O??(1) (?F and ?H2O are described in the specification).

Abstract: 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.

Abstract: 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.

Abstract: A glass sheet includes a first main surface and a second main surface opposite to the first main surface in a thickness direction. X represented by the following formula (1) is ?0.29<X<0.29: A×?1H/30Si+B×?Na2O+C×?Sn+D×?F=X (1). F0-3 determined according to the following formula (II) is 0.02 or more: F0-3=[average fluorine concentration (wt %) by SIMS at depth of 0 to 3 ?m in first main surface]×3 (II).

Abstract: A glass for chemical strengthening that is a float-formed glass for chemical strengthening includes, as represented by mass percentage based on oxides, from 65 to 72% of SiO2, from 3.6 to 8.6% of Al2O3, from 3.3 to 6% of MgO, from 6.5 to 9% of CaO, from 13 to 16% of Na2O and from 0 to 0.9% of K2O. In the glass for chemical strengthening, (Na2O+K2O)/Al2O3 is from 2.2 to 5. The glass for chemical strengthening has a sheet thickness (t) of 0.1 mm or more and 2 mm or less. A SnO2 amount of a bottom surface in an unpolished state of the glass for chemical strengthening is 6.2 ?g/cm2 or less (0.1?t?1 mm) or (2t+4.2) ?g/cm2 or less (1<t?2 mm).

Abstract: 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.

Abstract: The present invention relates to a glass sheet having an amount of fluorine contained in the glass of more than 0.23 mol %·?m and 21 mol %·?m or less on a depth-direction profile by secondary ion mass spectrometry (SIMS) in which a horizontal axis expresses depth and a vertical axis expresses fluorine concentration (mol %). According to the glass sheet of the present invention, warpage after chemical strengthening can be reduced and polishing treatment or the like before the chemical strengthening can be simplified or omitted.

Abstract: The present invention relates to a method for manufacturing a float glass containing a step of melting a glass raw material, a step of forming the glass melted by the preceding step into a glass ribbon while floating the glass on a molten metal, and a step of annealing the glass ribbon. In the forming step, a fluid containing a molecule having a fluorine atom is sprayed onto the glass ribbon to control a fluorine amount in the depth of up to 30 ?m in the thickness direction from the upper surface of the glass ribbon to more than 0.23 mol %·?m.

Abstract: The present invention relates to a glass sheet having a fluorine concentration at one surface larger than a fluorine concentration at the other surface, the surfaces being opposite to each other in a thickness direction, in which the following Formula (1) is satisfied and the amount of fluorine contained in the glass is more than 0.23 mol %·?m and 21 mol %·?m or less on a depth-direction profile by secondary ion mass spectrometry (SIMS) in which a horizontal axis expresses depth and a vertical axis expresses fluorine concentration (mol %). The fluorine concentration is an average fluorine concentration (mol %) by SIMS in the depth of from 1 to 24 ?m. 0.1??F/?H2O ??(1) (?F and ?H2O are described in the specification).

Abstract: The present invention relates to a glass sheet having a fluorine concentration at one surface larger than that at the other surface, in which the following Formula (1) is satisfied and the amount of fluorine contained in the glass is more than 0.23 mol %·?m and 21 mol %·?m or less on a depth-direction profile by SIMS. The fluorine concentration is an average fluorine concentration (mol %) by SIMS in the depth of from 1 to 24 ?m. 1?x??(1) (x is a maximum depth (?m) in which a slope at an arbitrary depth xi (?m) in the fluorine concentration profile by SIMS satisfies the following Formula (2)). [F(xi+0.1)?F(xi)]/0.1=?0.015??(2) (F(xi) represents a fluorine concentration (mol %) by SIMS at the depth xi (?m)).

Abstract: The present invention relates to a method for producing a float glass sheet, containing a step of melting a glass source material, a step of forming the glass melted in the previous step into a glass ribbon while allowing it to float on a molten metal, and a step of annealing the glass ribbon, in which the float glass sheet is a soda lime silicate glass, and in the forming step, a top surface of the glass ribbon that is opposite to a bottom surface thereof to be in contact with the molten metal is subjected to a dealkalization treatment in the float bath for 1 to 30 seconds and a surface temperature of the glass ribbon during the dealkalization treatment is 600° C. or higher.

Abstract: The present invention relates to a float glass manufactured by causing a molten glass continuously supplied onto a molten tin in a bath to flow on the molten tin toward an outlet of the bath, in which the float glass satisfies the following formula (1). According to the present invention, a high-quality float glass and a method for manufacturing the same are provided. [ Math . ? 1 ] ? 0 Da ? ( Ca - C ? ( x ) ) ? ? ? x Ca × D × 100 ? 0.