What causes the quality problems of aluminum coil coating?

Causes of quality problems in aluminum plate coil coatings
Coating is an important process in the entire aluminum coil coating production. The appearance quality of coated products not only reflects the protective and decorative properties of the product, but is also an important factor that constitutes the value of the product. However, various problems always arise during this critical process. So, what causes the quality problems of aluminum coil coating?

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1. Process
The coating process is closely related to the quality of the coating. It is required to control the relative linear speed ratio of the coating roller, paint roller, metering roller and substrate within a certain range. According to the different systems and film thicknesses of the products being coated, the coating should set a certain viscosity range to ensure smooth coating and improve product quality. The curing process and oven control of the coating must be controlled as required and must not be changed at will, otherwise it will seriously affect the color difference and performance of the coated product.
2. Raw materials
Coating and aluminum coil are the most influential factors in the coating process. Due to color differences between coating batches, the coating rate of aluminum powder coatings is not high due to insufficient fineness, poor coordination between coatings and solvents, and delamination. , will directly affect the coating effect and cause defects. The unevenness of the aluminum coil substrate, uneven film thickness, and poor edge deflection also directly affect product quality and overall use. Therefore, the selection of raw materials should be strictly controlled.
3. Equipment
The coating line requires the coating line equipment to be in good condition, the coating line equipment to run smoothly, without horizontal and vertical shaking, and the coating line roller to be polished smoothly. The lateral runout of all rollers of the coating machine must be controlled within the allowable range, otherwise it will seriously affect the surface quality of the coating.
4. Human factors
The operator's sense of responsibility, technical proficiency and standardization of operations are the keys to obtaining high-quality coating results. Therefore, it is necessary to strengthen the training of operators so that they can master the principles and key points of the coating process, strengthen their sense of responsibility, strictly follow the operating procedures, and ensure high-quality coating products.
5. Environment
The interior of the spray booth must be clean, dust-proof, insect-proof, and ventilated to ensure that the surface quality of the spray paint is not contaminated. At the same time, process conditions change in time due to changes in air temperature.
The above are the reasons for the quality problems of aluminum coil coating. These factors are interrelated and influence each other. Sometimes the occurrence of a defect is related to many factors, and specific problems need to be analyzed in detail and eliminated one by one. The quality of paint products, especially the appearance quality, directly affects the decorative effect of the product.