The effect of heating, rotational velocity and nozzle diameter size on the Sesame oil yield from a screw press

Using screw presses is a method for extracting oil, from oilseeds, which requires a low initial investment. Since most of the edible oil supplied through importation, it is important to promote the production methods to reduce the rate of imports. In this research, the Kern Kraft-KK20F screw press, made by Kern Kraft Company, with a capacity of 20 kg/hr and 2kW power, was evaluated for extracting oil from sesame seeds. A factorial experiment was carried out in a completely randomized design to evaluate the effect of grain heating, helical rotational speed, and nozzle size on oil extraction efficiency. In this experiment, heating at four levels of 40, 60, 80, and 100 ° C, helical rotational speed at three levels of 30, 40, and 50 rpm, and nozzle diameter size at three levels of 10, 12, and 15 mm were studied. The results of the analysis of variance showed that the effect of all factors on oil extraction efficiency is significant. Comparison of the mean of the main factors by Duncan's new multiple range test at the level of 5% showed that the highest efficiency was obtained at a heating temperature of 100 ° C, the rotational speed of 40 rpm, and nozzle diameter of 10 mm. Finally, a quadratic regression was suggested to predict oil extraction efficiency.