The spraying operation has high production efficiency and is suitable for manual operation and industrial automation production. It has a wide range of applications, mainly in the fields of hardware, plastics, furniture, military industry, and ships. It is the most commonly used coating method nowadays.
Spraying treatment The surface of aluminum panel components must be pretreated before spraying. The process flow is: alkaline washing → water washing → pickling → water washing → chromization → water washing → pure water washing. Alkaline washing is degreasing to remove oil stains and oil stains on the surface. Pickling is corrosion, which removes the natural oxide film on the surface. Chromizing is to form a firm conversion layer and increase the adhesion of the sprayed layer. After the aluminum panel components are pretreated, the working surface is sprayed. The process flow is: primer spraying→surface spraying→bottom and surface coating curing→finishing varnish spraying→finishing varnish curing.
The spraying thickness of the primer is 5-10μm to improve the adhesion of the surface layer. Surface spraying means spraying KYNAR500 fluorocarbon coating with a thickness of 20-30μm. This is a key process to provide the coloring, corrosion resistance and weather resistance of aluminum panel components. The bottom and top coatings cure quickly at 220-250°C. The thickness of the varnish coating is 10-15μm, and it is quickly cured at 220-250℃ to improve gloss and protect the fluorocarbon coating. The back surface of the aluminum panel member is not sprayed, and is only in its natural state after chromization.
The whole process of electrostatic spraying treatment of domestic aluminum panel component manufacturers is carried out on the fully enclosed continuous automatic processing production line introduced in Germany or the United States, Japan or Italy. The total length of the production line ranges from 300 to 420m. The largest spraying aluminum panel component The width ranges from 1.6m to 1.8m, and the annual production capacity can reach about 600,000 m2. The operation process of the entire production line is controlled by a microcomputer, with a high degree of automation, and is also equipped with environmental protection devices. The production line introduced from the United States adopts the current very advanced fully automatic electrostatic rotary cup spray gun. The air bearing turbine speed can reach up to 40,000r/min, which can generate 90000V electrostatic high voltage, so the spray rate is very high.
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Link to this article：Process flow for surface spraying of aluminum panel components
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