Asahi Glass Company, Limited

Koji Obayashi

Yusuke Takei

Toshiyasu Kawaguchi

Misao Okada

Kazuo Hamashima

Naruaki Tomita

Yasuharu Hirahara

The present invention provides a A metal conduit for molten glass and a vacuum degassing apparatus are disclosed, which are capable of coping with extension and contraction, and vibration. By disposing at least one convex portionso to have a height of 4 mm or above in a radial direction and continuously extend in a peripheral direction, it is possible to absorb thermal expansion and contraction without changing the entire length of the metal conduitand to suppress from the metal conduitfrom vibrated even when molten glassis conveyed by the metal conduit. By employing the metal conduitstated earlier in an upstream conveying pipeA, an uprising pipeU, a vacuum degassing vessel, a downfalling pipeL, a downstream conveying pipeB or the like in a vacuum degassing apparatus, it is possible to cope with thermal expansion and contraction, and vibration caused when conveying molten glass

Conduit for molten glass, connecting conduit for molten glass and vacuum degassing apparatus

When molten glass which is under an atmosphere of pressure P, is fed into a vacuum chamber capable of rendering a pressure to the molten glass to be in a range of 38 &lsqb;mmHg&rsqb;-(P-50) &lsqb;mmHg&rsqb; to perform degassing to the molten glass, a staying time of the molten glass in the vacuum chamber is in a range of 0.12-4.8 hours, whereby there is obtainable an effective degassing function to the molten glass.

Vacuum degassing method for molten glass flow

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Yokohama, Japan

Koji Obayashi