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. In the process of puffing section, the general requirement of impurity is less than 3%, and the requirement of crude fiber is about 8%.
2.Magnetic separation :Clearing the iron impurity which migLD 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. As the rice brain particles are small and poor liquidity, the iron impurities are always be wiped off by the magnetic barrels installed in the feeding port.
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%. Thus, on the one side, it can increase the output of the extrusion machine, and on the other side, it can improve the quality of the puffed rice bran.
4.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.
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%, and temperature will reach 50-55°C. After puffing, the rice brain are usually dried and cooled by plat dryer.
vegetable oil expeller machine :
|Screw speed||30-45r/min||30-40 r/min||30-40 r/min||28-40 r/min||28-40 r/min|
The above parameters is according to oil material that is refined, separated, flaked, steamed and fired, and the auxiliary equipments are complete with reasonable techniques.
Operating principle of vegetable oil expeller machine :
1.When oil press is on work, material enters the extruding chamber from the hopper and then moves forwards by the rotating pressing screw and is pressed.
2.Under higLDemperature condition in the chamber, there is quite strong friction among press screw, chamber and the oil materials.
3.On the other hand, root diameter of the pressing screw carries larger from one end to the other.
4.Hence when rotating, the thread not only pushes particles moving forwards but also turns them outwards as well.
5.Meanwhile, particles adjacent the screw will rotate along with screwÃ¢ÂÂs rotating, causing every particle inside the chamber to possess different speed.
6.Therefore, relative movement among particles creates neat which is necessary during manufacturing because of helping protein change property, damage colloid, increase plasticity, decrease oilÃ¢ÂÂs elasticity, resulting in high oil.
Construction features of vegetable oil expeller machine:
6LD series spiral oil press is mainly composed of 7 major parts of screw axis, press cage, feed mechanism, cake yielding mechanism. transmission system, electric control part and vacuum filter part. All the parts are assembled on the frame and screwed as a whole.
Characters of rapeseed oil cold press machine :
Simple design , easy to operate , wide suitability , continuous operation, high productivity and high oil product ratio.
Pictuire of rapeseed oil cold press machine
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