| 摘要 |
A vacuum degassing method for molten glass, which comprises introducing molten glass (G) into a vacuum degassing apparatus (10), subjecting it to degassing treatment under a predetermined reduced pressure condition and then withdrawing it for a subsequent step, wherein during the degassing treatment, a metal compound, which is at least one compound of metal selected from the group consisting of aluminum, titanium, silicon, zinc, magnesium, iron, chromium, cobalt, cerium and calcium, is supplied (e.g. via means 36) from outside of the vacuum degassing apparatus to the surface of a bubble layer formed in the molten glass in the degassing vessel (14) to diminish or eliminate the bubble layer. <IMAGE> |
