Vario-Planetary Mill "Pulverisette 4"

The "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 pa-rameters, it is possible to achieve results unattainable with any other ball mills.

This is 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 < 10 mm are fed in, a final fineness up to 0.1 µm can be achieved. The useful capacity is between 2 x 30 ml in the case of 80 ml grinding bowls and 2 x 125 ml when 250 ml grinding bowl 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 ma-terial to be ground and the grinding balls execute movements and tra-jectories 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 inde-pendently 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 pres-sures 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.

Features of performance:

• For the first time, all grinding parameters can be selected at will for optimal preparation of sample
• Programming of the grinding parameters by PC software as desired
• RS232 interface for programming and to transfer grinding parameters to the PC
• Real-time display of the speeds to monitor the grinding process
• Reversing option (direction of rotation reversed periodically) to improve the grinding results
• Emulation of various ball mills
• Variably adjustable pressure on sample (friction and/or impact)
• Final fineness << 1 µm
• Simultaneous grinding in up to 4 small or 2 large grinding bowls
• Quick, secure fastening of the grinding bowls
• Ease of cleaning