Pre-press Pretreatment

Pre-press Pretreatment:The purpose is to improve the appearance of oil in order to quickly and efficiently through the machine pressing or oil extraction. It typically includes the following series of processes:
Oilseeds Sheller: increase the protein content of meals. Broken: reducing grain size. Steaming and roasting / quenching: reduce the viscosity of oil products, and adjust the fuel moisture content.
Flaking: destroy the cell structure of the oil, making it easier to extract the oil.
Expanded: sometimes, depending on the raw material used, mainly in order to optimize the leaching characteristics of oilseeds.

Broken: The aim is to reduce the grain size to ensure uniform steamed fried. Broken by two crushing rollers with wrinkles completed, a crusher generally used or two pairs of crushing rolls, the number of the crushing roller and the size of the wrinkles on the roll depends on the size of the fuel grains.
Steaming and roasting: quenching process, the oil is heated, adjust the water to the desired state. Vertical steam steaming wok wok fried common two and horizontal steam. Either steaming wok 6-10 bar steam are used as a heating medium, such as for pressing, oil is heated to 90-110 ℃, such as for direct leaching, then heated to 65-72 ℃.
There are two ways to extract oil pressing plant: complete mechanical press (5-7% residual oil expeller cake) and low pre-press (expeller cake residual 12-20%), pre-press after the cake followed by solvent extraction.

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