THE EFFECTIVENESS OF SMALL RICE MILL MACHINE FOR RICE MILL OF RICE VARIETIES TRADING IN CHAI-NAT PROVINCE

This research was to find the efficiency of rice mill for rice varieties trading in Chai-Nat province by determining the optimum speed and the distance of gaps the rubber roller to appropriate of each varieties rice. In the experiments, three rice varieties were selected: Chai-Nat1 Rice, Rice berry and Thai Pathumthani Fragrant Rice from Ban Hua-Ta-phan Community, Sankhaburi District, Chai-Nat Province. The experiment used one kilogram of rice per time by controlling paddy has a 15 percent moisture content. After that, adjusted the speed of motor at 30-50 Hz and adjusting the distance of gaps the rubber roller to match of each varieties rice. The results of the experiment showed the optimum speed of Chai-Nat1 Rice, surface speed of rubber rollers A, B and C was 1,009.0, 590.3 and 1,019.0 rpm, respectively. Rice berry, surface speed of rubber rollers A, B and C was 1,110.3, 649.9, and 1,123.7 rpm, respectively. Thai Pathumthani Fragrant  Rice, the surface speed of the rubber rollers was 861.8, 503.9 and 870.2 rpm, respectively. Thai Pathumthani  Fragrant Rice, Gap between the rubber rollers is one millimeter. Rice berry and Chai-Nat1 Rice, Gaps between the rubber rollers is 0.9 millimeter. Therefore, the efficiency test results of the small rice mill showed that Chai-Nat 1received white rice, equivalent to 65percent of the weight of the paddy. In Rice berry obtained brown rice equal to 76 percent of the weight of the paddy and Thai Pathumthani Fragrant Rice obtained white rice, representing 75 percent of the weight of the paddy. The results of comparing the three types showed that adjust speed and the distance of gaps the rubber roller to appropriate of each varieties rice that resulted in receiving less broken white rice. The results of milling of Thai Pathumthani Fragrant Rice were more white rice than Chai-Nat 1, and for Rice berry milling could be done only once, instead of having to repeat rice milling twice, and the results of brown rice color were very satisfactory.