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Malting barley grading
In the grading of malting barley, the small-sized kernels
are separated on the outer screen.
Considerably larger quantities are to pass through the
outer screen when grading malting barley than in or-
dinary pre-cleaning of grain. In the grading of malting
barley it is therefore normally the capacity of the outer
screen that determines the capacity of the cleaner.
In the grading of malting barley the impurities from
screens and aspiration cleaner are usually 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 (B)
of the trough auger.
Use, for instance, a Kongskilde TRL blower with a ven-
turi to discharge the small kernels.
Grading
Basic grading of commercial malting barley is often
based on 90% grains exceeding 2,5 mm (in Denmark).
This has also been assumed in the following.
Before starting the grading of the malting barley, it is
advantageous to know the grading of the starting ma-
terial (the unsorted grain). This may be determined
manually by means of test screens, or you can ask a
feedstuff dealer to test one or more samples.
Based on the grading of the sample and the outer
screen, use the diagram overleaf to indicate the capaci-
ty required to obtain a final grading result of 90% grains
exceeding 2,5 mm.
Recommended capacities for malting barley grad-
ing (applies to KDC4000)
90
88
86
84
82
80
78
76
74
72
70
68
66
64
0
2
4
6
(A) Screen 2,5 x 16,5 mm
(B) Screen 2,65 x 16,5 mm
8
10
12
14
16
18
Capacity (t/hour)
The recommended capacities are subject to the fol-
lowing conditions
Final sorting result: 90 % grains exceeding 2,5 mm
Moisture content: ..................................... Max. 14 %
Inclination of KDC4000: .........................................5°
Inclination of KDC8000: .........................................9°
Examples (for KDC4000):
1. Starting material sorting: ...........82 %
Desired final sorting: ..................90 %
Outer screen slots: ....................2,5 x 16,5 mm
Recommended capacity
according to graph: ........................... 5 t/hour
2. Starting material sorting: ...........76 %
Desired final sorting: ..................90 %
Outer screen slots: ....................2,65 x 16,5 mm
Recommended capacity
according to graph: ....................9 t/hour
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 %.
Initial adjustment for malting barley grading
Inclination of KDC4000: .........................................5°
Inclination of KDC8000: .........................................9°
Inner screen (mm): ........ Ø9 / Ø9 / Ø7,4/Ø7,4/Ø7,4
Outer screen (mm): ....... 2,5 x 16,5 or 2,65 x 16,5
Selection of inner screen
The selection of the inner screen depends to a high
degree on the quality of the threshing and the expected
capacity. If the crop is reasonably well threshed, it will
sometimes be advantageous to replace the 2nd section
of the inner screen of Ø9 mm by an Ø7,4 mm screen
and thereby obtain a cleaner crop.
Selection of outer screen
The selection of the outer screen depends on the de-
sired capacity.
Where a high capacity is desired, the 2,65 x 16,5 mm
screen should be selected. You risk, on the other hand,
a separation of good grains of 3 - 12 % depending on
the starting material grading.
20
The 2,5 x 16,5 mm screen should be selected where a
lower capacity and perhaps two cycles can be accepted
to achieve a final grading result of 90 %.
(well threshed malting barley)
17
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