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

Provided are a vacuum-degassing method and vacuum-degassing device having superior efficacy in the vacuum-degassing of molten glass; more specifically, provided are a method for vacuum-degassing of molten glass and device for vacuum-degassing of molten glass whereby the occurrence of reboil bubbles is effectively suppressed. A method for vacuum-degassing of molten glass by melting raw glass material, which becomes silicate glass, and allowing the molten glass to flow to a passage within a vacuum-degassing tank the interior of which is held in a depressurized state, the method for vacuum-degassing of molten glass being characterized in that the vacuum-degassing is carried out under conditions satisfying equation (1) at the base of the vacuum-degassing tank. SS=pSO₂/P_abs2.0 (1) In equation (1), SS is the degree of supersaturation of SO₂ in the molten glass; pSO₂ is the partial pressure (Pa) of SO₂; and P_abs is the pressure (Pa) of the base of the glass passage in the vacuum-degassing tank.