Asahi Glass Company, Limited

Chikao Tanaka

Seiji Miyazaki

Osamu Sakamoto

Satoru Ohkawa

Shinji Takeshita

Takahiro Murakami

Kei Maeda

Setsuro Ito

Yasumasa Nakao

Kazuhiko Ishimura

Sei Nagano

Fumiaki Saito

Hajime Ito

Shinji Yamamura

Koji Hirasawa

Hiroshi Ando

A glass-melting furnace, which suppresses the effect of exhaust gas on molten glass quality, a process for producing molten glass, and a process and apparatus for producing glass products. The glass-melting furnace containing: a raw glass material particle feed portion disposed downwardly at a furnace wall portion in an upper portion of the glass-melting furnace; a heating unit provided under the feed portion, which forms a gas phase portion for converting raw glass material particles into liquid glass particles; a flue inlet disposed on the upstream side of the gas phase portion in a flow direction of the molten glass liquid; a furnace-bottom portion, which accumulates the liquid glass particles that produce the molten glass liquid; and a discharge portion, which discharges the molten glass liquid.

Glass-melting furnace, process for producing molten glass, apparatus for producing glass products and process for producing glass products

The present invention provides a process for producing a molten glass which can produce a molten glass having a good quality, a glass-melting furnace, a process for producing glass products and an apparatus for producing glass products. While an oxygen combustion burneris rotated by a motor, glass raw material particles (not shown) are dropped into a high-temperature gas phase atmosphere produced by a flame F of the oxygen combustion burner, to be changed into liquid glass particles. By rotation of an outlet (nozzle) of the oxygen combustion burner, the falling position of the liquid glass particles, changes with time. Accordingly, generation of bubbles caused by continuous fall of the liquid glass particles in a particular position on a molten glass liquid surface is prevented. Accordingly, it is possible to produce a molten glass having a good quality with few bubbles.

Process for producing molten glass, glass-melting furnace, process for producing glass products and apparatus for producing glass products

Glass raw material particles are dropped from an oxygen combustion burner, and the glass raw material particles are heated by a flame F of an oxygen combustion burnerand a thermal plasma P, to melt the particles. Liquid glass particlesproduced by the melting fall downwardly in a melting tank, and fall on a surface of a molten glass liquid G in the melting tank. Then, an upper layer Gof the molten glass liquid G is heated by electrodesof a heating apparatusprovided in the melting tank. By this method, air and residual gas generated in the molten glass liquid G and the liquid glass particlesfallen onto the surface of the molten glass liquid G, become bubbles, surface and are smoothly discharged.

A backup structure for a pipe for feeding a molten substance of high temperature has a pipe and a thermal insulation material surrounding the pipe wherein the pipe is provided with a plurality of projections on its outer periphery at predetermined intervals, and each of the productions is held at its both sides by the thermal insulation material.

Backup structure for a pipe for feeding a molten substance of high

A refining method for molten glass comprising a stirring step for stirring molten glass in a stirring vessel, a feeding step for feeding the molten glass into a vacuum vessel via an uprising pipe, a degassing step wherein the molten glass is put under a reduced pressure in the vacuum vessel, bubbles produced on the molten glass surface and a flow of the molten glass just below the molten glass surface are blocked by a barrier provided in the vacuum vessel, and the molten glass is degassed in a state that a bubble layer is formed on the molten glass surface, and a discharging step for discharging the molten glass after degassing from the vacuum vessel through a downfalling pipe to a storage vessel.

Refining method for molten glass and an apparatus for refining molten

A method for producing a glass-ceramic article, which comprises crystallizing a glass article consisting essentially of from 40 to 60% by weight of SiO.sub.2, from 13 to 19% by weight of Al.sub.2 O.sub.3, from 0 to 6% by weight of B.sub.2 O.sub.3, from 8 to 16% by weight of MgO, from 2 to 6% by weight of CaO, from 3 to 9% by weight of ZnO, from 5 to 12% by weight of TiO.sub.2, from 0 to 3% by weight of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, from 0 to 3% by weight of P.sub.2 O.sub.5 and from 0 to 2% by weight of ZrO.sub.2.

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Tokyo, Japan

Chikao Tanaka