The present invention relates to a cover glass for a display, which is a glass plate having a first main surface and a second main surface. The cover glass contains, as represented by mol percentage based on oxides, from 50 to 75% of SiO.sub.2, from 5 to 20% of Al.sub.2O.sub.3, from 2 to 20% of Na.sub.2O, from 0 to 6% of K.sub.2O, from 0 to 15% of MgO, from 0 to 10% of a total amount (CaO+SrO+BaO) of CaO, SrO and BaO, from 0 to 5% of a total amount (ZrO.sub.2+TiO.sub.2) of ZrO.sub.2 and TiO.sub.2, from 0 to 10% of B.sub.2O.sub.3, and from 0 to 20% of Li.sub.2O. The cover glass has a ream minimum distance of 100 mm or more and 1,000 mm or less, and a ream period of 1 mm or more and 30 mm or less.

A stirrer for glass melting which can be used over a prolonged life expectancy, while maintaining a high strength, even in an environment exposed to a high temperature and an oxygen-containing gas atmosphere for a long period of time, and can prevent the air bubbles from being mixed into the glass melt. A stirrer for glass melting is made of iridium or an iridium-based alloy, and has a rotary shaft and a stirring part, a surface region S1 of the surface of the rotary shaft above the stirring part is covered with a cylindrical cover, the cover has a two-layer structure in which an outer layer made of platinum or a platinum rhodium alloy and an inner layer made of platinum or a platinum rhodium alloy containing metal species are joined together, and oxide particles of metal species are precipitated in a dispersed state on a surface of the inner layer on an opposite side to a surface adjacent to the outer layer, wherein the stirrer for glass melting has a pipe made of iridium or an iridium-based alloy which surrounds at least the surface region S2 of the cover from the lower end of the cover to a predetermined height at an interval.

A stirrer for glass melting which can be used over a prolonged life expectancy, while maintaining a high strength, even in an environment exposed to a high temperature and an oxygen-containing gas atmosphere for a long period of time, and can prevent the air bubbles from being mixed into the glass melt. A stirrer for glass melting is made of iridium or an iridium-based alloy, and has a rotary shaft and a stirring part, a surface region S1 of the surface of the rotary shaft above the stirring part is covered with a cylindrical cover, the cover has a two-layer structure in which an outer layer made of platinum or a platinum rhodium alloy and an inner layer made of platinum or a platinum rhodium alloy containing metal species are joined together, and oxide particles of metal species are precipitated in a dispersed state on a surface of the inner layer on an opposite side to a surface adjacent to the outer layer, wherein the stirrer for glass melting has a pipe made of iridium or an iridium-based alloy which surrounds at least the surface region S2 of the cover from the lower end of the cover to a predetermined height at an interval.

A system and method for stirring molten material such as glass are provided. To prevent sagging of a cover of a stirring system, a portion where deformation or sagging may significantly occur is suspended by a suspension system, so that local sagging and deformation of the cover is suppressed. As a result, a crack which may occur in the cover is suppressed, and therefore, contamination of the molten material is likewise suppressed.

The present invention relates to a cover glass for a display, which is a glass plate having a first main surface and a second main surface. The cover glass contains, as represented by mol percentage based on oxides, from 50 to 75% of SiO.sub.2, from 5 to 20% of Al.sub.2O.sub.3, from 2 to 20% of Na.sub.2O, from 0 to 6% of K.sub.2O, from 0 to 15% of MgO, from 0 to 10% of a total amount (CaO+SrO+BaO) of CaO, SrO and BaO, from 0 to 5% of a total amount (ZrO.sub.2+TiO.sub.2) of ZrO.sub.2 and TiO.sub.2, from 0 to 10% of B.sub.2O.sub.3, and from 0 to 20% of Li.sub.2O. The cover glass has a ream minimum distance of 100 mm or more and 1,000 mm or less, and a ream period of 1 mm or more and 30 mm or less.

The present invention relates to a cover glass for a display, which is a glass plate having a first main surface and a second main surface. The cover glass contains, as represented by mol percentage based on oxides, from 50 to 75% of SiO.sub.2, from 5 to 20% of Al.sub.2O.sub.3, from 2 to 20% of Na.sub.2O, from 0 to 6% of K.sub.2O, from 0 to 15% of MgO, from 0 to 10% of a total amount (CaO+SrO+BaO) of CaO, SrO and BaO, from 0 to 5% of a total amount (ZrO.sub.2+TiO.sub.2) of ZrO.sub.2 and TiO.sub.2, from 0 to 10% of B.sub.2O.sub.3, and from 0 to 20% of Li.sub.2O. The cover glass has a ream minimum distance of 100 mm or more and 1,000 mm or less, and a ream period of 1 mm or more and 30 mm or less.

Provided is an apparatus (1) for manufacturing a glass article, including: a glass melting furnace (2) configured to produce molten glass; a treatment device (6) configured to perform a predetermined treatment on the produced molten glass; and a forming device (5) configured to form the molten glass into a predetermined shape that has been subjected to the predetermined treatment. The treatment device (6) includes: a treatment tank (13, 15) to be supplied with the molten glass; and a casing (12) configured to hold the treatment tank (13, 15). The casing (12) is supported in a suspended manner.

Provided is an apparatus (1) for manufacturing a glass article, including: a glass melting furnace (2) configured to produce molten glass; a treatment device (6) configured to perform a predetermined treatment on the produced molten glass; and a forming device (5) configured to form the molten glass into a predetermined shape that has been subjected to the predetermined treatment. The treatment device (6) includes: a treatment tank (13, 15) to be supplied with the molten glass; and a casing (12) configured to hold the treatment tank (13, 15). The casing (12) is supported in a suspended manner.

An apparatus for manufacturing glass includes radially inner and outer flaw channels physically separated from each other by a common wall that allows heat transfer to occur between molten glass flowing through the outer flow channel and molten glass flowing in the opposite direction through the inner flow channel.

An apparatus for manufacturing glass includes radially inner and outer flaw channels physically separated from each other by a common wall that allows heat transfer to occur between molten glass flowing through the outer flow channel and molten glass flowing in the opposite direction through the inner flow channel.