Patent ID: 6062047
Filing Date: 2000-05-16
Classification: C03B

Abstract:
A device for making a rod having a cross-sectional composition gradient, the device comprising: a connection zone, a diffusion zone, and a conditioning zone,a) The connection zone comprising at least two reservoirs for molten glass, the two reservoirs including an interior reservoir 4 and an exterior reservoir 5 that is exterior to interior reservoir 4, each reservoir having a lower end,b) The diffusion zone comprising a vertical casting tube 6 into which the lower end of the exterior reservoir discharges directly, into which the lower end of the interior reservoir extends,c) The conditioning zone comprising heating elements 11 to control temperature in the conditioning zone, and opening into a vertical, cylindrical mold 14 positioned below, and in the axis of, casting tube 6 and having a diameter greater than that of the casting tube,d) mold 14 having a movable bottom 17 and means to move bottom 17 between a high position and a low position in mold 14.