Development And Performance Evaluation Of Rice Destoning Machine

4.2    Discussion
4.2.1    Stone separation efficiency(SSE): The result of stone separation efficiency of the machine are presented in table 4.2, separation of the stone from rice is higher with the third variety of the rice ( AlhajiA’aba) which produced the highest stone separation efficiency of 77.3% while the first variety (Bokola) produce the lowest separation efficiency of 72.6%. this could be to the fact that the length of the rice is very small which is similarto the length of stone which makes it difficult to be separated from each other.
4.2.2    Rice separation efficiency (RSE):The result of rice separation efficiency of the machine is also presented in table 4.2. the result reveal that the average rice separation efficiency is also higher at the separation of the third variety of the rice (AlhajiA’aba) known to be 81.0% but lower at the second variety (Kodoqiche) known to be  79.0%.This could be due to the fact that the time taken during the evaluation of third variety is higher than the time taken during the evaluation of the second variety.
4.2.3    Impurity Level (IML):From the result in table 4.2, the impurity level after separation of the three varieties of rice is known to b 7.8%, 7.5%, and 6.5% respectively. Impurity level after separation is proportional to the stone separation efficiency.
4.2.4    Tray Loss (TL): From the result, the average tray losses remain almost the same for the three varieties as shown in table 4.2.