METHOD FOR VACUUM-DEGASSING OF MOLTEN GLASS, DEVICE FOR VACUUM-DEGASSING OF MOLTEN GLASS, METHOD FOR PRODUCING MOLTEN GLASS, DEVICE FOR PRODUCING MOLTEN GLASS, METHOD FOR PRODUCING ARTICLE MADE OF GLASS, AND DEVICE FOR PRODUCING ARTICLE MADE OF GLASS

摘要

To provide a vacuum-degassing method and a vacuum degassing apparatus excellent in the effect of vacuum-degassing molten glass, more specifically, a method for vacuum-degassing molten glass and a vacuum degassing apparatus, capable of effectively suppressing formation of reboil bubbles.;A method for vacuum-degassing molten glass, which comprises 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 maintained in a reduced pressure state, to vacuum-degas the molten glass, wherein vacuum-degassing is carried out under conditions satisfying the following formula (1) at a bottom portion of the vacuum degassing vessel: SS=pSO2/Pabs2.0 wherein SS is the supersaturation degree of SO2 in the molten glass, pSO2 is the partial pressure (Pa) of SO2, and Pabs is the pressure (Pa) at the bottom portion of the glass flow passage of the vacuum degassing vessel.