![]() ![]() China, India, Nigeria, USA and Myanmarare the leading producing countries in the world, while Nigeria ranks highest in West Africa accounting for 51% of production in the region(Ajeigbe et al., 2015). Developing countries in Asia, Africa and South America account for over 97% of the global area and 95% of the global production of this crop. ![]() According to Oteng-Frimpong et al., (2017), groundnut is grown on 26.4 million hectare across the world, with a production level of 37.1 million metric tons. Groundnut (Arachishypogaea) or peanut, is an important oil seed and food crop cultivated in semi-arid and subtropical regions of the world. The study showed that the develop machine is efficient for groundnut dehulling operation. Conclusively from the study, best conditions for dehulling roasted groundnut are clearance level of 9.50 mm at a machine speed of 300 rpm to yield a dehulling efficiency of 80.96 %, separation efficiency of 91.89 % and mechanical damage at a reduced value of 1.93 % at a throughput capacity of 55.27 kg/h. The change in the machine capacity significantly (P<0.05) depends on the machine speed followed by the clearance. Furthermore, it was revealed that throughput capacity of the developed machine increases with increased speed. Also, it was deduced that change in the separation efficiency depends on machine speed followed by clearance although the effect is not significant (P<0.05). Results from this study showed that at machine speed of 300 rpm, optimum dehulling efficiency was achieved and above this speed, the efficiency reduces. In each run of the experiment, 1 kg of a well-prepared groundnut was used. Dehulling experiments were carried out at machine speed of 200, 300, 400 and 500 rpm and at clearance values of 0.0095, 0.0090 and 0.0085 m. The components of the machine were designed following the standard machine design procedures. This research was undertaken to develop and evaluate a roasted groundnut dehulling machine. The major problem facing the availability of groundnut in Nigerian market is the post-harvest processing in which removal of chaff is a major. ![]()
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