1.Puffing: the rice bran is injecting high pressure steam and high temperature water through the extrusion machine, so that it can improve the temperature and moisture in the extrusion machine,
and can also form the high pressure to process the rice bran. All these can make the the rice bran become porous columnar structure from the original pulverized state.
All these effectively passivate the activity of various of enzyme in the rice bran, and destroy the fat layer structure, so that it will be easier for the oil yield.
2.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%, and temperature will reach 50--55°C. After puffing, the rice brain are usually dried and cooled by plat dryer.