Pulverisette 4 vario-planetary mill is capable of emulating ball mills of conventional design, precisely simulating the types of stress entailed and thus reproducing or optimising grinding processes
Due to the high flexibility available for selecting the grinding parameters, it is possible to achieve results unattainable with any other ball mills.
This is described as the ideal mill for mechanical activation and alloying.
The main applications are in the field of materials research and, of course, wherever a powerful, innovative planetary mill is required.
When particles <10mm are fed in, a final fineness up to 0.1um can be achieved.
The useful capacity is between 2x30ml in the case of 80ml grinding bowls and 2x125ml when 250ml grinding bowls are used.
Method of operation.
With standard planetary ball mills the grinding bowls are rotating and mounted eccentrically on a rotating support disc.
The rotational speed of the supporting disc can be selected at will; the grinding bowl rotates at a fixed transmission ratio.
Due to the overlapping of grinding bowls and supporting disc, the material to be ground and the grinding balls execute movements and trajectories in the grinding bowl, which are defined by the transmission ratio.
With the Pulverisette 4 vario-planetary mill the rotational speeds of grinding bowls and supporting disc can be adjusted completely independently of each other.
By varying the transmission ratio it is possible to control the movements and trajectories of the grinding balls at will so that the balls strike the inner wall of the bowl vertically (high impact energy), approach each other tangentially (high friction) or just roll down the inner wall of the bowl (centrifugal mills).
All intermediate levels and combinations of frictional and impact pressures can be set as required.
By changing the transmission ratio it is therefore possible for the first time to carry out mechanical activation as well as mechanical alloying.
Furthermore, it is also possible for the first time to optimally adjust a planetary ball mill to the material to be ground, the size of the grinding bowls and the grinding balls.
