This makes the values for the flowability according
to Jenike, the bulk density and the angle of repose almost
identical for the samples produced with both grinding
methods. In the three larger particle fractions the values
of the flowability and the bulk density increase with
larger particle sizes. Here the increase is greater for the
samples ground with a hammer mill than for the particles
ground with the roller mill. The values of the angles of
repose become smaller with increasing particle size, with
the decline being larger for samples ground with a
hammer mill. It can be assumed that this behaviour is
caused by the larger surface roughness of the particles
after grinding with a roller mill.