Patent ID: 6119484
Filing Date: 2000-09-19
Classification: C03B,C22B,Y02P

Abstract:
A vacuum degassing apparatus for molten glass, comprising:a vacuum housing where a vacuum is created;a vacuum degassing vessel housed in the vacuum housing;an introduction device communicated to the vacuum degassing vessel so as to introduce molten glass before degassing into the vacuum degassing vessel; anda discharge device communicated to the vacuum degassing vessel so as to discharge the molten glass after degassing from the vacuum degassing vessel;wherein at least one of the introduction device and the discharge device includes a path to flow a large quantity of the molten glass, and at least a portion of the path that directly contacts the molten glass is constituted by refractory material having a porosity of not greater than 5%; andfurther wherein a cortex of the refractory material that directly contacts the molten glass is scalped by at least 5 mm.