The material to be
milled is placed
between the feed and
center rolls. Each
adjacent roll
rotates at
progressively higher
speeds. For example;
the feed roll may
rotate at 30 rpm,
the center roll at
90 rpm and the apron
roll at 270 rpm.
Material is
transferred from the
center roll to the
apron roll by
adhesion. The
dispersion is
achieved by the
shear forces
generated between
the adjacent rolls.
The milled material
is removed from the
apron roll by a
knife that runs
against the roll.