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The powder to be dispersed is filled little by little into the cylindrical solid material reservoir and compressed with a tamper. Lucerne University determined an excellent reproducibility of the tamping density in the solid material reservoir with a deviation of 3.4 %. The filled solid material reservoir is inserted into the dispersing head of the RBG. The powder, which has thus been uniformly compressed across the filling level, is then conveyed onto a rotating brush at a precisely controlled feed rate. An adjustable volume flow streams over the tightly woven precision brush at a very high speed and blows the particles out of the brush. The dispersing head assembly consists of a dispersing holder, dispersing cover, precision brush, and solid material reservoir.

Fig. 1: Schematic diagram of RBG system

Dosing is performed via the precisely controlled feed rate of the feed piston. The desired mass flows can be quickly and reproducibly specified based on the cross-section of the solid material reservoir, the precisely adjustable feed rate of the feed piston, and the easy-to-determine tamping density of the powder in the reservoir.

The powder separated from the reservoir by the precision brush is almost wholly dispersed into the constituent particles (see Fig. 2) in the dispersing head by air flowing at high speed. The dispersing air flow is regulated automatically by an integrated mass flow control.

Fig. 2: Particle size distribution with the welas^® digital 2000

Four different dispersing covers can be used for optimal dispersion.

The construction design of the RBG system allows for operation in "powder"/"no powder" pulse mode with cycle lengths ranging down to a second. The function can be used manually on the unit or via a connected computer.

RBG solo can be optionally controlled via the delivered software from a Windows computer or tablet.