The grinding and brushing treatment of the substrate removes dirt through the dual action of dissolving the alkali washing solution and mechanical friction of the brush. The brushing treatment of color painting production line is designed as mechanical, and the brushing equipment is also called brushing machine. It usually consists of rotary brushing roller, brushing roller electric control device of brushing roller storage box and alkali nozzle circulation system.

 

 

 

The process of drying and brushing is usually set between the first and second degreasing stages. The special material of brushing roll, together with alkali washing, is used to rotate the upper and lower surfaces of the substrate. The direction of rotation is the same or opposite to that of the steel strip. The friction produced by the high-speed movement of the brush and the surface of the base water glue yard plate is used to remove the substrate. Surface adherent dirt and rough oxides make the substrate surface active.

 

 

 

There are usually two types of brush rollers, compression brush and bristle brush. Compression brushes are made by bonding fine SiC or Alumina abrasives to nylon filaments, then making fiberboard or cushion from the nylon filaments, cutting them into a segment of ring cylinder sleeve after solidification, and mounting them on a roll core to make brush rolls. The brush body of the hard bristle brush is made of nylon wire containing silicon carbide abrasive. Abrasive particle size is different, the use is different, the two brushes have their own advantages and disadvantages. Compression brush is because nylon filament is thin and easy to tear, short service life. The notable advantages of hard brush are good wear resistance of nylon filament, fine abrasive particle size and high pressure of brush roll on the surface of the brushed board. Therefore, the surface of the brushed substrate is uniform and the service life of the brush is long, which is about several times longer than that of the compressed brush. However, this brush should not be used to treat the thin plate substrate. The treatment effect is not ideal, and will cause the substrate to curl. In order to prevent nylon filament from overheating and melting in the process of using brush roller scrubber, alkali solution should be continuously sprayed on the surface of the plate for cooling and wetting.