Page 40 - Handbook on Food Fortification in Kenya
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1) Micro-feeders – is a The size of the hopper is
continuous dosing system usually smaller and can be a
which adds the premix into the disadvantage for larger flour
flour stream at a preset rate. mills since refilling takes up
The rate of addition will depend more of the miller’s time. This
on the type of premix and the type of feeder uses
flow rate of the flour through
the system. Drum or Roller type Feeder
– This type has been used
Mixing is achieved by use of a extensively. It operates by
screw conveyor installed right allowing the powder to
after the micro feeder. There are pass between two revolving
3 types namely the revolving cylinders, as shown in the
disc, drum/roller type and the diagram. Either a DC or AC
screw type: motor can power the drum and
a gearbox and a pulley system
Revolving Disc - This older control the rotation speed.
type of feeder uses a revolving
disk equipped with a slide Pulleys and wheels of differing
mechanism to control the rate diameters can be used to make
of powder discharge. The disk gross adjustments in the feed
revolves at a constant speed rate capacity.
and can be run with either an
AC or DC motor.
Figure 14.
FOOD FORTIFICATION HANDBOOK | 40
