for the 13-mm-size group the surface was covered with a
60 grit sandpaper. A detailed layout of the experiment
parameters is given in table 3.
The five classified mixtures derived from sieving the
5 kg batch of cracked nuts were placed on the trough of the
laboratory vibrating feeder. The feeder was operated until a
distinct segregation of the fractions was obtained. A
complete separation was achieved after 10 s of operation.
Twenty replications were carried out with the same
classified mixtures.
For the evaluation of separation efficiency we used the
following expression developed by Kashayap and Pandya
(1965):