The smaller the resistivity of the powder, the easier the powder particles to release charge, the less adsorption force and easy to fall off. Therefore, the higher the resistivity of the powder, the easier the saturation of the coating is. The volume resistivity of the coating is planned in the range of 109-1013 Ω· cm. The distance between the head of the spray gun and the workpiece is generally 150-200 mm. The interval, viewpoint and moving speed of the spray gun should be consistent. The initial increase rate of the film thickness is directly proportional to the powder supply. After a certain period of spraying, the film thickness increases slowly. When the powder supply is increased, the accumulation is reduced to increase the recovered powder. Generally, the powder output is 70-120g / min It is suitable for the powder to be in uniform mist.

　　Compensation for coating defects after spraying,

If there is a defect, the coating should be wiped off and re sprayed, or special tools (such as knife) should be used to evenly spread the powder coating on the defect of the coating for industrial aluminum profile to melt it. If the workpiece has been confirmed, it can be used.

　　(1) The coating thickness of 100-300 μ M can be obtained by powder coating once, while the general coating needs 4-8 times of application, so the power of construction can be advanced and the production cycle can be shortened.

　　(2) There is no solvent in the coating, no need to dilute and adjust the viscosity, which changes the working conditions and reduces the risk of fire, which is conducive to the protection of the environment.

　　(3) The adhesion and compactness of the coating are improved. The mixed coating of metal powder and ceramic powder can advance the mechanical and physical functions of the coating and the anti-corrosion function of the coating.

　　(4) It has high mechanization and can recover the excessive coating, which reduces the consumption of coating.

　　(5) The coating equipment is disordered and the capital cost is high. The appearance and leveling property of the coating are not as good as those of the spraying method. Some powder coating methods have requirements on the shape and scale of the workpiece. It can only be used for powder coating, and the cost is high.

　　Source: Jiangmen spray processing factory