Electrostatic powder spray coating method is to use the induction effect of high voltage electric field, so that the powder coating and the coated object are induced and bring opposite charges to each other, so that the powder coating with charge is adsorbed on the coated object with opposite charges, and then the powder coating coating after melting leveling, curing baking coating method. Without the surface treatment of aluminum alloy extrusion profile appearance is single, and in the humid atmosphere is easy to corrosion, so aluminum profiles are generally surface treatment, and powder spraying is a major trend in the development of aluminum profiles at this stage.

As powder spraying has the following advantages

(1) surface color rich, soft texture;

(2) good corrosion resistance, not easy to be polluted;

(3) good weather resistance, shelf life of more than 10 years;

(4) powder coating strong and durable, simple production characteristics. Powder coatings have developed rapidly since their application in aluminum profiles. Especially in the economically developed Yangtze river delta and pearl river delta region, the market share of powder spraying aluminum has exceeded 60%.

With the implementation of national energy saving and emission reduction policy, and the improvement of cost control awareness of aluminum profile enterprises, reducing powder consumption in aluminum profile spraying is an important direction of energy saving and emission reduction and cost reduction.

There are many factors that affect powder spray consumption in aluminum profile spraying. On the one hand, it is related to the nature of powder coating itself, and on the other hand, it is closely related to the powder spraying process, such as the process conditions of spraying, the distance between workpieces, the use state of equipment, the operation level of staff and so on. This paper does not introduce the influence of powder coating process, but mainly analyzes from the technical point of view of powder coating, and summarizes several solutions for reference.

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