Why is the cooking oil pressed by the oil expeller precipitated

Generally, the oil crops are pressed by the oil expeller and the cooking oil is deposited for a period of time, cooking will play foam, overflow pot. Why is that?

First of all, oil press after pressing the oil called "crude oil", because the oil contains a large amount of phospholipids, phospholipids are also known as gum and unsaturated fatty acids, and some crude oil also contains aflatoxin B1, harmful to health. The presence of gum not only affects the quality and storage stability of oil, but also emulsified in the subsequent process of alkali refining and deacidification, increasing refining consumption and affecting the quality of oil.

Therefore, after the press equipment presses the edible oil, must pass through the vegetable oil refining plant, that can remove in the grease the human body harmful substance, simultaneously achieves the national standard.

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