IMPROVEMENTS TO INDUCTION FURNACES FOR THE SYNTHESIS OF GLASSES

摘要

In an induction furnace for the synthesis of glasses, in particular fluorozircon ate glasses for optical fibres for telecommunications, the support device (6') for t he crucible (3) is associated with a pair of sleeves (7, 9) between which an annular element (8) which constitutes the actual support element is inserted. The first sleeve (7) h as such longitudinal dimensions that the crucible (3) is supported in the annular elemen t (8) in such a way as to be spaced from the planar element (5'), and the second sleeve h as such longitudinal dimensions that its top edge is at a level higher than that of the top edge of the crucible (3), to obtain a homogeneous temperature region extending a t least along the entire height of the crucible (3) (Fig.2).