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: The glass plate according to the present invention has a buffer layer containing a plurality of sulfate crystals on a bottom surface which is brought into contact with a molten metal during formation in accordance with a float method, and the plurality of sulfate crystals have a median value of equivalent circle diameters of 350 nm or smaller as observed from a thickness direction.

Abstract: A glass sheet has one surface and the other surface facing the one surface in a thickness direction, wherein a fluorine concentration (average fluorine concentration by SIMS at a depth of 1 to 24 ?m) in the one surface is higher than that in the other surface. The following expression is satisfied: 0.07??F/?H2O. ?F (mol %) is a value obtained by subtracting an average fluorine concentration in the surface having the lower fluorine concentration from that in the surface having the higher fluorine concentration, and ?H2O (mol %) is an absolute value of a value obtained by subtracting an average H2O concentration in the surface having the higher fluorine concentration from that in the surface having the lower fluorine concentration.

Abstract: The present invention relates to an alkali-free float sheet glass having a glass transition point of from 730 to 850° C. and a temperature T4 of from 1220 to 1350° C., and containing, indicated by mass % on the basis of oxides: SiO2: 57 to 65%, Al2O3: 14 to 23%, B2O3: 0 to 5.5%, MgO: 1 to 8.5%, CaO: 3 to 12%, SrO: 0 to 10%, and BaO: 0 to 5%, satisfying MgO+CaO+SrO+BaO of from 12 to 23%, containing F in an amount of from 0.1 to 0.35 mass %, containing Cu in an amount of from 0.3 to 3 mass ppm, containing Cl in an amount of from 0 to 0.05 mass %, and satisfying a ratio f1/f2 of from 0.05 to 0.5.

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 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 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 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: A glass production method is provided that includes a forming step of forming a glass ribbon from molten glass by a glass forming unit, and a conveying step of gradually cooling the glass ribbon to a temperature less than or equal to a strain point temperature of glass while conveying the glass ribbon by conveyance rolls. The conveying step includes a buffer layer forming step of forming a buffer layer made of an inorganic salt by spraying a solution containing the inorganic salt directly onto at least a portion of the conveyance roll and causing the solution sprayed onto the conveyance roll to dry out.

Abstract: A glass sheet has one surface and the other surface facing the one surface in a thickness direction, wherein a fluorine concentration (average fluorine concentration by SIMS at a depth of 1 to 24 ?m) in the one surface is higher than that in the other surface. The following expression is satisfied: 0.07??F/?H2O. ?F (mol %) is a value obtained by subtracting an average fluorine concentration in the surface having the lower fluorine concentration from that in the surface having the higher fluorine concentration, and ?H2O (mol %) is an absolute value of a value obtained by subtracting an average H2O concentration in the surface having the higher fluorine concentration from that in the surface having the lower fluorine concentration.

Abstract: A glass sheet includes 4 mol % or more of Al2O3. In the glass sheet, a surface Na2O amount in one surface of the glass sheet is lower than the surface Na2O amount in the other surface of the glass sheet by 0.2 mass % to 1.2 mass %.

Abstract: A dark green colored glass comprising 100 parts by weight of a matrix component of soda lime silicate glass, and, as coloring components, from 0.5 to 2.0 parts by weight of total iron calculated as Fe.sub.2 O.sub.3, more than 1.0 to 3.0 parts by weight of total titanium calculated as TiO.sub.2, from 0.003 to 0.02 part by weight of CoO, from 0 to 0.0008 part by weight of Se, from 0 to 0.05 part by weight of total chromium calculated as Cr.sub.2 O.sub.3, from 0 to 0.5 part by weight of total vanadium calculated as V.sub.2 O.sub.5 and from 0 to 0.5 part by weight of total cerium calculated as CeO.sub.2, wherein the proportion of ferrous iron calculated as Fe.sub.2 O.sub.3 in the total iron calculated as Fe.sub.2 O.sub.3 is from 15 to 50%.

Abstract: Ultraviolet ray absorbing colored glass, which comprises 100 parts by weight of a base component consisting of soda lime silicate glass and coloring components consisting essentially of from 0.08 to 0.4 part by weight of total iron as calculated as Fe.sub.2 O.sub.3, from 0.05 to 0.4 part by weight of vanadium as calculated as V.sub.2 O.sub.5, from 0.0005 to 0.03 part by weight of Se, from 0 to 0.005 part by weight of CoO, from 0 to 2.0 parts by weight of TiO.sub.2 and from 0 to 0.8 part by weight of CeO.sub.2.

Abstract: Ultraviolet ray absorbing colored glass, which comprises 100 parts by weight of soda lime silicate glass as a base component and coloring components consisting essentially of from 0.12 to 0.7 part by weight of total iron as calculated as Fe.sub.2 O.sub.3, from 0.2 to 2.0 parts by weight of total cerium as calculated as CeO.sub.2, from 1.0 to 2.5 parts by weight of total titanium as calculated as TiO.sub.2, from 0 to 0.01 part by weight of CoO and from 0.0001 to 0.02 part by weight of Se, and which has an ultraviolet ray transmittance of at most 10%, as stipulated in ISO-9050 and as calculated as of a thickness of 5 mm, whereby the dominant wavelength measured by illuminant C is within a range of from 565 to 600 nm.