37
Malting barley sorting
In the sorting of malting barley the small-sized
grains are separated on the outer screen.
Considerably larger quantities are to pass through
the outer screen when sorting malting barley than in
ordinary pre-cleaning of grain. In the sorting of
malting barley it is therefore normally the capacity
of the outer screen that determines the capacity of
the combi-cleaner.
In the sorting of malting barley the impurities from
screens and aspiration cleaner are asually kept
apart, as it is not desirable that the small grains mix
with the impurities from the aspiration cleaner.
Therefore remove the covering plate from the outlet
of the trough auger.
Use, for instance, a Kongskilde TRL blower with a
venturi to disharge the small grains.
Sorting
Basic sorting of commercial malting barley is nor-
mally based on 90 % grains exceeding 2.5 mm.
This has also been assumed in the following.
Before starting to sort the malting barley it is advan-
tageous to know the sorting of the starting material
(the unsorted grain). This may be determined
manually by means of Kongskilde's test screens or
you can ask a feedstuff dealer to test one or more
samples.
Test screen
with slots
Bottom scren (without
slots - for collection
of small-sized grains)
Based on the sorting of the grain and the outer
screen used the diagram overleaf will show the
capacity required to obtain a final sorting result of
90 % grains exceeding 2.5 mm
Recommended capacities for malting barley
sorting
(A) Screen 2.5 x 16.5
(B) Screen 2.65 x 16.5
The recommended capacities are subject to the
following conditions:
Final sorting result:................................ 90 % grains
exceeding 2,5 mm
Moisture content:.......................... Max. 14 % (Well-
threshed malting barley)
Inclination of combi-cleaner: ................................ 5°
Examples:
1. Starting material sorting: ................... 82 %
Desired final sorting: ......................... 90 %
Outer screen slots: ............................ 2.5 x 16.5
Recommended capacity
according to graph: ........................... 5 t/h
2. Starting material sorting: ................... 76 %
Desired final sorting: ......................... 90 %
Outer screen slots: ............................ 2.65 x 16.5
Recommended capacity
according to graph: ........................... 9 t/h
If the starting material sorting is lower than the
curve of the outer screen used, this means that two
cycles will be required to reach a final sorting result
of 90 %.
Starting material sorting %
Capacity (t/h)
90
88
86
84
82
80
78
76
74
72
70
68
66
64
0 2 4 6 8 101214161820
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