Roller coating is an important process in aluminum alloy sheet painting production line. The quality of spray products, especially the appearance quality, will directly affect the decoration effect. Even if you pay attention to it during processing, there will always be quality defects. Here are five reasons that lead to the defects of aluminum coil.
1. Processing defects
Painting process is closely related to the quality of painting. The relative linear speed of painting roller, painting roller, measuring roller and plate should be controlled in a certain area. A certain viscosity range should be set according to the film thickness of different systems and products, so as to ensure the smooth progress of coating and promote the improvement of product quality. Dry-curing process of coating, the operation of drying box must be carried out according to the requirements, and cannot be changed at will, otherwise the coating effect will be seriously affected.
2. Raw material defect
Coating and aluminum solenoid are important factors affecting the quality of the coating.Because the color cast in the middle of the coating batch number, the insufficient particle size of the coating, the low coating rate, and the poor coordination between the coating and the organic solvent will directly affect the actual effect of the coating, resulting in uneven aluminum coil, uneven film thickness, poor edge deflection value, and also affecting the application of products.
3. Human factor defect
Proficiency of operators in aluminum coil and operation specifications are the basis for obtaining high-quality spraying. Therefore, it is necessary to strengthen the training of practical operators to ensure the spraying quality of products.
4. Mechanical defect
The spraying equipment shall be in good condition, stable in operation and free from horizontal or vertical vibration,spray roller grinding carefully.The horizontal vibration of all rollers of coating machine should be controlled within the allowable range, otherwise it will seriously affect the quality of coating surface.
5. Natural environmental defects
The internal structure of the spraying room should be kept clean, anti-fouling, moth-proofing, and naturally ventilated, so as to ensure that the quality of the spraying surface layer will not be polluted by the environment.
Warm Tip: Pay attention to the change of temperature. With the change of temperature, the processing standard should also be adjusted accordingly.
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