Gentle Size Reduction Down to the Nano Range
Jan 07 2009
In contrast to the PM 100 the speed ratio of sun wheel to grinding jar is 1:-1, i.e. the mill operates in centrifugal mode. This results in a different ball movement so that the sample is not so much crushed by impact effects but more gently ground by pressure and friction, which
allows for a lower temperature rise in the grinding jar and less abrasion. The PM 100 CM offers an excellent alternative for all applications where size reduction must not necessarily be carried
out with maximum energy input.
When planetary ball mills are used for processes such as mechanical alloying or chemical syntheses, it can be helpful to monitor and
document the pressure and temperature inside the grinding jar during operation. For these applications, Retsch now offers the new
measuring system PM GrindControl. A built-in sender in the grinding jar lid sends digital signals to a USB receiver, which is connected
to a PC. Up to 200 values are measured per second. The transmitted data can easily be processed with common LIMS programmes.
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