| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow passage for easily obtaining a high-quality glass gob of high-refractive index glass or low-Tg (glass transition temperature) glass the molding conditions of which are hardly selected and which is requested in recent years. SOLUTION: The flow passage is connected to a molten glass tank, used for making molten glass flow out and characterized in that the flow passage has a groove on the inner wall thereof in order to control a current of the molten glass, the groove is formed like a spiral having the axis in the traveling direction of the current of the molten glass or a plurality of grooves are formed discontinuously and the shapes and directions of them are irregular. COPYRIGHT: (C)2009,JPO&INPIT
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