Oil pressed from pre-press and solvent extrating are both crude oil. For using in cooking, crude oil should be refined for edible oil for human being. Refiney section is mainly the parts for Degumming and Neutralizing,Bleaching,De-waxing, and De-odorizing. Then refined oil can be used directly for daily usage.

When oil press operating, the prepared materials enter the pressing chamber from the hopper and then move forwards by the rotating of pressing screw and is pressed under the high-pressure condition in the chamber, friction between material and chamber will be created, which also created friction and relative movement among material particles, on the other hand, root diameter of the pressing screw carries larger from one end to the other. hence, when rotating, it not only pushed particles moving forwards but also turns them outwards as well, meanwhile, particles adjacent the screw will rotation along with screw’ rotating, causing every particle inside the chamber to possess different speed, therefore relative movement among particle creates heat which is necessary during manufacturing. because of helping protein change property, damage colloid, increase plasticity, decrease oil’s elasticity, resulting in high oil.