Asahi Glass Company, Limited

Mitsuyoshi Sakai

Hajime Itoh

Michito Sasaki

Rei Kitamura

Atsushi Tanigaki

Misao Okada

Keito Sekine

A vacuum degassing apparatus for molten glass includes a vacuum housing which is evacuated to be depressurized therein; a vacuum degassing vessel which is provided in the vacuum housing to vacuum-degas molten glass as the molten glass flows therein; an uprising pipe which connects to the vacuum degassing vessel, and sucks and draws up undegassed molten glass to introduce the undegassed molten glass into the vacuum degassing vessel; and a downfalling pipe which connects to the vacuum degassing vessel and draws down the degassed molten glass from the vacuum degassing vessel to discharge the degassed molten glass. The cross sectional area of the path at the upper end portion of the uprising pipe is larger than the cross sectional area of the path at the lower end portion of the uprising pipe.

Vacuum degassing apparatus for molten glass

A process for producing a glass for cathode ray tubes, having a SbOcontent of from 0 to 0.19% as represented by mass percentage and containing HO, which process comprises a step of melting a raw material in an atmosphere under a pressure of Pto obtain a molten glass, and a step of vacuum degassing the molten glass in an atmosphere under a pressure Pwhich is lower than P, wherein the pressure P of the molten glass is made to be at most (6.1 W+0.06) atm in the vacuum degassing step, wherein W is the content of said HO as represented by mass percentage.

Process for producing a glass for cathode ray tubes

A vacuum degassing apparatus for molten glass includes a vacuum housing; a vacuum degassing vessel provided in the vacuum housing; an uprising pipe which connects to the vacuum degassing vessel; and a downfalling pipe which connects to the vacuum degassing vessel. The vacuum housing has an accommodating portion to accommodate the uprising pipe and an accommodating portion to accommodate the downfalling pipe, at least one of which is divided horizontally into a plurality of sections to form a plurality of divided rooms juxtaposed in the vertical direction, and the respective divided rooms are provided with a pressure controller to control the pressures of the respective divided rooms independently.

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Chiba, Japan

Mitsuyoshi Sakai