Rapeseed, also known as rapaseed, rappi, rapa, oilseed rape. It is a bright-yellow flowering member of the family Brassicaceae, consumed in China and Southern Africa as a vegetable. Rapeseed/Canola is the third largest source of vegetable oil in the world after wheat and barley. It is a mustard crop that is cultivated primarily for its seed which produces about forty percent oil and a high-protein animal feed. Rapeseed oil is also known as vegetable or canola oil. It is made from the black seeds of rapeseed plant belonging to Brassica family which also includes vegetables like broccoli, cabbage and cauliflower. Oilseed rape is partly self-fertile and is pollinated by wind, gravity and insects.
Natural rapeseed/canola oil contains 50% erucic acid. Also some wild seeds contain glucosinolates that lowers the nutrient value of rapeseed for animal feed. However it is quite a health product with 7% saturated fat compared to 14% in olive oil or 51% in butter. It is also rich in omega-3 and omega-6. Rapeseed oil is also preferred in that it is much more heath resistant compared to sunflower oil. This makes it more eligible for deep-frying.
Rapeseed/Canola → cleaning → softening → flaking → cooking → pressing → pressed canola oil + pressed cake
Cleaning is the beginning of oilseeds pretreatment, which can influence the final oil quality and machine life time directly.
Cleaning section contains magnetic selector, stoning machine, etc. The main function of cleaning is to remove mechanical impurities in rapeseed.
The cleaning process can reduce the abrasion of equipment, ensure safe operation, reduce oil loss, increase oil yield and improve the quality of oil and oil cake. Canola oil extraction plant adopts rapeseed selector, gravity destoner, and magnetic separator to remove the clay, stone, metal and other impurities in the rapeseeds.
Softening is to adjust the temperature and moisture of rapeseed with steam. Softening adjusts moisture and temperature of oil seeds, softens and increases plasticity of oil seeds. For low oil content oil seeds (soybean, rape seed/canola, cotton seeds, etc.), softening is an essential process for better flaking effect.
Adopt rotary roaster or flat bottom roaster for rapeseeds roasting to achieve the desired temperature and moisture. The flat bottom roaster adopts conduction oil as the heat source and stirs the materials with the mixing blade. The rotary roaster has the rapeseeds turned within the rotating drum for uniform heating.
Flaking uniforms oil seeds to thin cake, which benefits oil pressing and extraction.
Flaking presses oil seeds from granulous to laminar, which broke cell tissue of oil seeds and create beneficial condition for cooking. Flaking also makes oil flows out smoothly when pressing or solvent extraction. Flaking roll is common for soybean.
Cooking reduces moisture in flakes, which is much easier to press oil out from oil seeds.
Cooking is to wet, heat, steam and to cook flakes to change the internal structure of flakes, including destroying cells, protein solidification and denaturation, etc.
All these changes makes oil easy to isolate and also enhance crude oil quality. Cooking pot can be used for processing groundnut/peanut, canola seed, cottonseed, sunflower seed, etc.
The final products of this section is just pressed canola oil and pressed oil cake.
With the aid of feeder, the roasted rapeseeds enter the canola oil press machine. The worm rotates along with the main shaft to push the materials forward. With the reducing of the volume of the pressing chamber, the pressure within the chamber increases gradually. Rapeseed oil press machine is equipped with the automatic barrel heating system. Meanwhile, the friction force produces heat. The cells of the materials are destroyed and the oil flows out. When the oil flows onto the filtering barrel, by the vacuum pump, the oil is pumped into the barrel and the residues are left on the filter cloth, thus the pure oil is obtained.
Pressing/prepressing is to press oil from oil seeds or cakes. In general, there are several oil press machine for this step. Pressing section is mainly for processing high oil content, as groundnut/peanut, sunflower seed, canola seed, cottonseed, corn germ etc.
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