The important processes that follow the harvesting of various agricultural crops, especially
the cereal crops, the process of sifting and separation of seeds from impurities, in order to
get rid of the impurities that exist with the seeds in the fi
rst degree, and to get rid of the
distorted and damaged seeds in the second degree.
This study was aimed to study the effect of the sieve holes of a local industrial electric
screening machine in the process of sifting and cleaning the seeds of some cereal crops,
and evaluation the performance of this machine, and then determining the optimal sieve
diameters for the seeds of crops studied and economically important in Syria.
The active part of the machine, called the vibrator, consists of three layers of sieves and
four gutters, the first sieve to get rid of large impurities (gravel, cloths, ...), the second
sieve to extract the very large seeds, the third sieve moves the seeds to the graphite
machine, It produces soft impurities (broken and small seeds).
The second sieve was studied. The results showed that the best sieve of the cumin seeds
with holes (0.8 mm) compared with actually used the sieve (1 mm). The best sieve seeds of
holes (1.25 mm), compared with actually used the sieve (1.40 mm). The best sieve for
local lentil seeds with holes (2 mm), compared with actually used the sieve (2.5 mm). The
best sieve of chickpea seeds with holes (5 mm) compared with actually used the sieve (5.5
mm).
Therefore, it is recommended to use the sieves with the holes shown above to screen the
studied seeds instead of the actual sieves used in the screening factories due to their
inaccuracy in the screening process because the diameter of these holes is not consistent
with the sizes of the studied seeds.