In the process of cooking oil processing, from cleaning to finished edible oil, a whole cooking oil production line can be divided into four parts: oil pretreatment equipment, oil extraction plant, oil refinery, and oil filling equipment. Oilseed cleaning is the first step to be carried out in the cooking oil production line.

During the harvesting, drying, and transportation of oilseed, impurities such as soil, dust, sand, and plant stem diameter will be mixed in. Before making oil, the oilseed needs to be cleaned, which has the advantages of reducing oil loss, increasing oil yield, improving cake quality and purity; reducing the wear of equipment caused by impurities, which is conducive to extending the service life of equipment, reducing dust and improving the production workshop environment.

Common methods for cleaning oilseed in cooking oil production line:

1. Screening method

The screening method uses the differences in the size, shape, density, etc. of the oilseed and impurities, and uses the size of the screen opening, the aspect ratio, the upper and lower layers or the front and rear segments, and combines the principles of relative motion (amplitude, speed), and neutral classification to separate impurities larger than and smaller than the aperture.

2. Wind selection method

Based on the difference in density and speed of oilseed and impurities, the method of using wind to separate light impurities such as dust. Generally not used alone, mostly combined with screening.

3. Magnetic separation method

Magnetic separation method is a method of using the suction of magnetic steel to screen out magnetic metal impurities mixed in oilseeds.

4. Specific gravity method

The specific gravity method is a method of removing pulp impurities based on the difference in density and suspension speed between oilseed and stone mud blocks, and the oilseed is subjected to wind and vibration on the perforated screen surface.

5. Water selection method

Directly contact oilseeds with water to wash away the mud on the surface of the oilseeds, and to settle and remove heavy mud and stones. Such as water selection and peeling of sesame and rapeseed.

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