Reasons for the quality problems of aluminum coil coating
ã€China Aluminum Network】 Coating is a key process in the entire aluminum coil coating production line. The quality of coating products, especially the quality of the appearance, directly affects the product decoration effect. Therefore, we must first understand the common defects in the coating process and the reasons for its formation.
There are many reasons for the formation of defects, the common are the following five categories:
1. The raw material coating and aluminum coil are the factors that can affect the coating quality during the coating process. Due to the color difference between batches of the coating, the fineness of the coating is not enough and the coating rate is not high. The coating and the solvent are not well matched. Layers and so on will directly affect the coating effect and produce defects. 'Aluminum roll substrate's unevenness, uneven film thickness, and poor edge deflection also directly affect product quality and overall use. Therefore, when choosing raw materials, it should be strictly controlled.
2. The equipment coating line requires that the coating equipment is in good condition, the painting equipment requires smooth operation, and there must be no horizontal and vertical shaking. The coating roll requires fine grinding. All rollers of the coating machine must be controlled within the allowable range. Otherwise, the coating surface quality will be seriously affected.
3. The process coating process has a close relationship with the quality of the coating. It requires that the relative wire speed ratios of the coating roller, the paint roller, the metering roller and the substrate be controlled within a certain range. According to different systems and coating product film thickness, set a certain range of viscosity of the coating to ensure smooth coating and promote the improvement of product quality. The curing process of paints, oven control must be controlled as required, and must not be arbitrarily changed, otherwise it will seriously affect the color difference and performance of the coated products.
4. Environmental requirements The interior of the painting room should be clean and dust-proof, insect-proof, and certain ventilation performance to ensure the surface quality of the painting is not polluted. At the same time due to changes in temperature and timely changes in process conditions.
5. The responsibility of human factors operators, and the technical proficiency and standardization of operations, are the key to obtaining high-quality coating effects. Therefore, we must strengthen the training of operators and allow operators to grasp the principles and key points of coating technology, strengthen the responsibility, and strictly follow the operating procedures to ensure high-quality coating products.
The above factors are interrelated and affect each other. Sometimes the occurrence of a kind of defect is related to many factors. It must be analyzed concretely and eliminated one by one.
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