| 摘要 |
<PICT:1035585/C1/1> A glass melt 2 is refined by inductively heating a layer-like zone A in the melt and causing the zone to pass upward through the melt. The melt may be traversed successively by a number of such heated zones. The container 1 may be held stationary and one or more surrounding coils 3 and 4 moved upward; or the coil 3 may be held stationary and container 1 moved vertically. The glass in the heated zone has reduced viscosity, and the diameters of bubbles therein increase, and consequently the tendency of the bubbles to rise increases. The wall of the container 1, of ceramic, may be cooled by air. |
