RA 00048.pdf - OAR@ICRISAT

Table 1. Comparison of six dehulling units on sorghum grain (Perten at al. 1974).
Extraction
rate
Chemical composition
Kernel
cracking' Color b Ash Protein Fat Fiber
Dehuller (%) (%) (%) (%) (%) (%)
Eurafric M-164 80 54 > 3 7 1.2 12.9 2.9 0.9
Buhler-Miag prototype 75 15 > 3 7 1.3 13.0 2.7 0.9
Decomatic 76 24 > 3 7 1.1 12.8 2.6 0.7
Vertical shelling 80 8 35.1 0.9 11.6 1.9 0.4
machine type 270
Palyi Compact mill 78 41 > 3 7 1.1 13.0 3.1 1.1
Speaf 76 10 > 3 7 1.4 12.6 2.8 1.3
Whole sorghum — — > 3 7 1.7 12.8 3.9 2.3
a. Weight percentage less than 2 m m .
b. Lower numbers represent lighter colors.
0.4
than with the PRL or PRL/RIIC dehuller.
0.3
0.2
0.1
Figure 9.
0 10 20 30 40 50 60 70
% Kernel removed
Comparative rate of flour color improvement
(reflectance measurement
at 450 nm) as a function of progressive
dehulling with laboratory
commercial abrasive-type and
attrition-type dehullers Horizontal
line represents a traditionally acceptable
flour. (Reichert and Youngs
1976.)
Intermediate and Pilot Scale
Sorghum Processing
Facilities in Africa
The last 10 years have seen a proliferation of
village and industrial-scale systems for processing
sorghum grain. Countries in Africa have been the
testing site for many of these developments.
Sotramil: Zinder, Niger
This mill, which has a capacity of 5400 tonnes per
year, is equipped with a model-G Bavaria Record
dehuller (approximately 1.1 tonne/hr) and one
attrition-type Sepial wet (500 kg/hr) dehuller
(Miche and Feillet 1980). Besides sorghum, wheat
is also processed by simply grinding and sifting of
the whole grain. The Sepial dehuller is apparently
not functional and has been abandoned. At one
time it had been used for fermented-millet flour
production.
Sentenac Mill: Dakar, Senegal
trophotometer to measure flour color, Oomah et
al. (1981a) showed that the PRL dehuller equipped
with resinoid disks and the PRL/RIIC dehuller
equipped with fine-grit stones were more efficient
than the HGT equipped with coarse-grit carborundum
stones. To produce the same acceptable
color, the yield was 12 to 15% lower with the HGT
This mill includes receiving, cleaning, dehulling,
storage, and grinding equipment and has an
hourly capacity of 2-3 tonnes (Miche and Feillet
1980). Dehulling is accomplished with a Wondergrain
Jaybee dehuller operating on a batch basis.
The mill processes wheat, maize, sorghum, millet,
and dry legumes.
556