method of vacuum degassing of molten glass, apparatus for vacuum degassing of molten glass, process for producing molten glass, apparatus for producing molten glass, process for producing glass product, and apparatus for producing glass product

摘要

Method for vacuum degassing of molten glass, Apparatus for vacuum degassing of molten glass, Process for producing molten glass, Apparatus for producing molten glass, Process for producing glass product, and Apparatus for producing glass product By a vacuum degassing method and an excellent vacuum degassing apparatus the vacuum degassing effect of molten glass, more specifically a method for vacuum degassing of molten glass and a vacuum degassing apparatus capable of effectively suppress the formation of blister bubbles. a method for vacuum degassing of molten glass comprising melting glass materials to be silicate glass and passing the resulting molten glass in a flow passage in a vacuum degassing vessel, the interior of which is kept in a state of reduced pressure, to vacuum degass the molten glass, in which vacuum degassing is performed under conditions satisfying the following formula (1) in the bottom portion of the vacuum degassing vessel: ss = pso ~ 2 ~ / p ~ abs 2.0 (1) where ss is the supersaturation degree of so ~ 2 ~ in the molten glass, pso ~ 2 ~ is the partial pressure (pa) of so ~ 2 ~ and p ~ abs ~ is the pressure ( pa) at the bottom portion of the glass flow passage of the vacuum degassing vessel.