Determination of physical properties of soybean, design and fabrication of improved soybean dehuller
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Date
2011
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Publisher
Sokoine University of Agriculture
Abstract
The objective of this study was to investigate the methods for improving dehulling
efficiency and throughput of soybean dehuller, which included studying of some physical
properties of soybean at different moisture levels related to dehulling, the use of different
pre-treatment methods to loosen the seed coat to facilitate its removal during dehulling,
and finally to develop an improved manually operated prototype dehuller which can dehul
moist grain without clogging and undertake performance test of this dehuller. Four levels
of moisture content ranging from 14 to 20 % dry basis (d.b) were used to evaluate the
effect of moisture content on physical properties of soybean grains. In this moisture range,
mean grain length, width, thickness, arithmetic mean diameter, geometric mean diameter,
surface area, porosity and thousand grains weight increased with increasing moisture
content. On the other hand, bulk density, true density and sphericity were found to
decrease with increase in moisture content. The prototype dehuller was designed and
fabricated with a dehulling surface which can dehul moist grain without clogging. The
effect of pre-treatment methods on dehulling was carried out to evaluate the dehulling
efficiency and throughput of the prototype dehuller. The pre-treatments investigated
included boiling the grain at different durations followed by cooling to room temperature
and soaking the grain for different durations followed by a rest period to allow surface
moisture to be absorbed. The improved dehuller was used to dehull the pre-treated grain
and the effect of pre-treatments on dehulling efficiency was evaluated based on the extent
of seed coat removal. Also the effect of different pre-treatments on throughput of the
dehuller was evaluated. The dehuller was able to achieve dehulling efficiency of 70.62 %
for Uyole Soya-1 and 72.57 % for TGX 1895-33F. Throughput obtained was 50.76 kg/h
and 55.50 kg/h for Uyole and TGX 1895-33F, respectively.
Description
Keywords
Physical properties of soybean, Methods for imSoybean proving dehulling efficiency, Soybean
Citation
Mushi ,J. A( 2011). Determination of physical properties of soybean, design and fabrication of improved soybean dehuller . Morogoro: Sokoine University of Agriculture.