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.

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.

A sheet of glass can be formed in a batch process by introducing molten glass onto a layer of molten tin within a tank. The tank may be outfitted with infrared emitters to control the amount of heat delivered to the tank while the sheet of glass is formed. A lower surface of the tank can have a three-dimensional shape, and the molten tin may be removed from the tank while the sheet of glass is ductile so that the sheet of glass is molded by the three-dimensional shape, thereby producing a shaped sheet of glass. The delivery of infrared energy to the tank may be facilitated by one or more ceramic glass surface.

Provided is a sheet glass production process for properly producing sheet glass having a convex shape in section in a width direction orthogonal to the advancing direction of a glass ribbon. A glass ribbon G2 advancing on molten metal 22 is heated so as to have both edge portions G2B heated more intensely than a central portion G2A in a width direction thereof in an upstream zone of the molten metal bath, and a plurality of rolls 23 are rotated in contact with both edge portions G2B of the glass ribbon G2 such that upstream rolls 23A in an advancing direction F1 have a lower peripheral speed than downstream rolls 23B in the advancing direction.

Provided is a sheet glass production process for properly producing sheet glass having a convex shape in section in a width direction orthogonal to the advancing direction of a glass ribbon. A glass ribbon G2 advancing on molten metal 22 is heated so as to have both edge portions G2B heated more intensely than a central portion G2A in a width direction thereof in an upstream zone of the molten metal bath, and a plurality of rolls 23 are rotated in contact with both edge portions G2B of the glass ribbon G2 such that upstream rolls 23A in an advancing direction F1 have a lower peripheral speed than downstream rolls 23B in the advancing direction.

Disclosed is a float bath which allows easy temperature control according to an internal position, and a glass manufacturing apparatus and glass manufacturing method including the float bath. The float bath includes a plurality of heaters provided at an upper portion of the float bath to supply heat into the float bath, and a shield provided between predetermined heaters among the plurality of heaters to block heat transfer therebetween.

Disclosed is a float bath which allows easy temperature control according to an internal position, and a glass manufacturing apparatus and glass manufacturing method including the float bath. The float bath includes a plurality of heaters provided at an upper portion of the float bath to supply heat into the float bath, and a shield provided between predetermined heaters among the plurality of heaters to block heat transfer therebetween.

The present invention discloses glass ceramics, and a production method and a dedicated device therefor. Glass ceramics are prepared by using tantalum-niobium tailings, blind mining of natural stone material is greatly reduced, and comprehensive utilization efficiency of tantalum-niobium tailings is improved. The glass ceramics obtained by the production method and the dedicated device has few bubbles and high strength, and the yield and the quality of the finished product are both improved. Moreover, the idle tantalum-niobium tailings are utilized in the production, so that resources are saved.

Provided is a sheet glass production process for properly producing sheet glass having a convex shape in section in a width direction orthogonal to the advancing direction of a glass ribbon. A glass ribbon G2 advancing on molten metal 22 is heated so as to have both edge portions G2B heated more intensely than a central portion G2A in a width direction thereof in an upstream zone of the molten metal bath, and a plurality of rolls 23 are rotated in contact with both edge portions G2B of the glass ribbon G2 such that upstream rolls 23A in an advancing direction F1 have a lower peripheral speed than downstream rolls 23B in the advancing direction.

Provided is a sheet glass production process for properly producing sheet glass having a convex shape in section in a width direction orthogonal to the advancing direction of a glass ribbon. A glass ribbon G2 advancing on molten metal 22 is heated so as to have both edge portions G2B heated more intensely than a central portion G2A in a width direction thereof in an upstream zone of the molten metal bath, and a plurality of rolls 23 are rotated in contact with both edge portions G2B of the glass ribbon G2 such that upstream rolls 23A in an advancing direction F1 have a lower peripheral speed than downstream rolls 23B in the advancing direction.