There are known several pretreatment methods for extracting crude oil from rice bran, such as for example a heat treating method involving heating and drying of the rice bran at a temperature above 80 oC or a cooking method where heating and drying are performed after adding steam or hot water to the material.
Does rice bran oil lower cholesterol?
Rice bran oil not fiber lower cholesterol in humans. American Journal of Clinical nutrition, vol. 81, No. 1, 64-68. Murai, S; and N. Kiyoshi (2005). Apparatus for pretreatment for extracting crude oil from rice bran. United states patent.
How does an expeller work?
The expeller consists of a screw (or worm), rotating inside a cylindrical cage (barrel). The material to be pressed is fed between the screw and the barrel and propelled by the rotating screw in a direction parallel to the axis.