FRITSCH PULVERISETTE 4 classic line - Manual (Page 9)

With a particle feed size of < 10 mm, it is possible to achieve a final fine-
ness of up to 0.1 µm. The useful capacity is between 2 x 5 ml for 12 ml
grinding bowls and 2 x 225 ml when using 500 ml grinding bowls.
2.2.1 Operating principle
The grinding bowls for planetary ball mills can be rotated and placed off-
centre on a rotating support disc. The rotational speed of the support
disc can be selected. The grinding bowl rotates at a fixed gear ratio. The
rotation of the grinding bowls and the support disc in conjunction causes
the grinding stock and grinding balls to describe movements and trajec-
tories inside the grinding bowl, movements whose shape and impact is
determined by the gear ratio. Comminution occurs due to the combina-
tion of friction and high-energy impacts. Planetary ball mills with a fixed
gear ratio have been optimised for single processes.
The rotation speeds of the grinding bowls and support disc can be set
entirely independent of one another with the Vario-Planetary Mill PUL-
VERISETTE 4. The movements and trajectories of the grinding balls can
be adjusted as desired by varying the gear ratio: the balls can be caused
to impact the walls of the bowl vertically (high impact energy), approach
the wall tangentially (high friction), or simply roll on the inner wall of the
bowl (centrifugal mill).
All intermediate stages and combinations of frictional and impact pres-
sure can be set. This makes it possible for the first time to perform both
mechanical activation as well as mechanical alloying with a single mill by
changing the gear ratio.
Furthermore, for the first time a planetary ball mill can be ideally
adjusted to the grinding stock being comminuted and the size of the
grinding bowls and balls.
2.3 Obligations of the operator
Before using the PULVERISETTE 4, this manual is to be carefully read and
understood. The use of the PULVERISETTE 4 requires technical knowl-
edge; only commercial use is permitted.
The operating personnel must be familiar with the content of the oper-
ating manual. For this reason, it is very important that these persons
actually receive the present operating manual. Ensure that the operating
manual is always near the device.
The PULVERISETTE 4 may exclusively be used within the scope of applica-
tions set down in this manual and within the framework of guidelines
put forth in this manual. In case of non-compliance or improper use, the
customer assumes full liability for the functional capability of the PUL-
VERISETTE 4 and for any damage or injury arising from failure to fulfil this
obligation.
Safety information and use
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