Pre-processing line

Cleaning and cooking are the steps before oilseed pressing, directly affecting pressing efficiency, equipment service life, and final oil quality.

The cleaning part includes several types of cleaning machine, depending on the raw material situation. It has three purposes: 

(1) removing hard impurities like iron impurities and stones to protect the pressing machine from damage;

(2) removing light impurities such as straw and dust, which would otherwise adsorb oil and block oil passages during pressing, thereby improving oil yield;

(3) removing mud and sand to prevent them from accelerating oil oxidation and causing bad flavor. 

The cooking part can adjust the  raw material to the best state before pressing.  It plays an important part in oil pressing.

(1) Steam heat denatures proteins and ruptures cell walls, releasing the oil in the cell to increase the oil production yield; 

(2) precise control of moisture and temperature provides the material with proper physical characteristics and reduce the stickness;

(3) it inactivates endogenous enzymes like lipoxygenase to prevent rancidity, while also removing raw taste and enhancing the flavor. It also increases the quality of cake/meal.

After pre-processing, the raw material will be conveyed to pressing machine.