In the flour processing process, the different impurities are removed from wheat gradually by different devices according to the characteristics of impurities.

Particle sizes: Screening equipment can remove larger and smaller impurities in raw materials.

Different suspension speed or density: The air separation equipment can remove light impurities in the raw materials.

Magnetic characteristic: Magnetic equipment can effectively remove magnetic metal impurities in raw materials.

Different strength: by wheat scourer equipment, the impurities with lower strength than wheat are broken and then removed by screening.