Peanut oil pressing is a common production method of edible oil, but a series of pretreatment is needed before it enters the oil pressing stage. These steps can not only improve the oil yield, but also improve the oil quality. The following are the main pretreatment steps before peanut oil extraction:

1. Cleaning+shelling-cleaning up oil and improving product quality.

 Cleaning: With the help of cleaning equipment such as magnetic separator, vibrating cleaning screen and stone remover, peanut oil is carefully removed from impurities, such as stones, soil, stems and leaves and iron. This operation not only helps to improve the oil yield and oil quality, but also effectively reduces the wear of production equipment caused by impurities and prolongs the service life of equipment.

Shelling: Peanut shell contains almost no oil. Its existence not only can not produce oil, but will absorb oil and reduce the oil yield. In addition, the shell is often accompanied by impurities such as soil, and shelling treatment can significantly improve the oil yield and improve the quality of crude oil and cake.

2. Crushing+embryo rolling-change the oil shape and improve the oil production efficiency.

Crushing: the particle size of peanuts is reduced by crushing process, and the contact area between oil and oil press equipment is increased, so as to ensure that the particle size of peanuts after crushing is uniform, not easy to agglomerate and rarely powder, which meets the standards of subsequent blank rolling, thus improving the oil production efficiency and total amount.

Rolling embryo: By mechanical pressing, the crushed materials of peanuts are transformed into embryo sheets, which destroys the internal cell structure of oil and reduces the path length of oil escaping. At the same time, this morphological change is also conducive to enhancing the effect of steaming and frying and promoting the release of oil.
3. Steaming and frying-regulating temperature and moisture

Steaming and frying: By regulating the temperature and moisture of peanut oil, the protein inside the oil material is denatured, which promotes the aggregation of oil, reduces the viscosity and surface tension of oil, and thus makes the oil precipitate more fully.

Through the above pretreatment steps, peanuts can be squeezed. It should be noted that no matter whether it is pressed or leached, the crude oil is obtained. If you want to produce high-quality peanut oil, you need to refine it to ensure that the refined oil reaches the national level and has high safety.

To sum up, the most important function of pretreatment technology in peanut oil production line is to provide the most suitable oil conditions for subsequent oil extraction equipment and leaching equipment, maximize the extraction of oil and improve oil production, so oil plants must not ignore this technology.