1.Screening: Removing the chaff and broken rice in the rice bran, in case of they will influence the oil yield and the desolvent of wet meal in the next process.
2.Magnetic separation: Clearing the iron impurity which might be in the rice brain. Since in the process of puffing, the iron impurity will be harmful to the screw of extrusion machine, affect the puffing effect.
3.Quenching and tempering: it is the process of preheating so that to improve the temperature of the rice bran before puffing. After quenching and tempering the temperature will be controlled at 65–75 °C, and the moisture will be controlled at 10 ~12%.
4.Puffing: To make the rice bran powder to pellet , it is much more easy to solvent extract the oil out.
5.Drying: The moisture of puffed material comes from the extrusion machine is too big and the temperature is too high for direct leaching, the must be experience to process of drying and coo-ling, thus the moisture will reach 7%–9%.