Common problems of colour coated aluminium coil in roofing

　　The common problems of colour coated aluminium coil in roofing include surface scratches of the colored coil, scratches of raw materials, coating leakage and uneven points leakage.

　　1. The surface of a colour coated aluminium coil is painted with scratches. Surface scratches are a surface defect in the production of aluminum panels. It affects the appearance of color coated products and reduces the corrosion resistance of color coated products. According to different sources, it can be divided into raw material scratches and production process scratches.

　　2. Scratches on the surface of raw materials. Quality defects in the bottom plate in galvanizing production. When a color coated aluminium coil is produced by using the scratched substrate, the color difference on the surface resulting in the quality defect of the lack of coating. The control measure is to check the production quality of the previous process and prevent the scratched raw material substrate from entering the factory.

　　3. Coating leakage. Leakage coating refers to the quality defect formed in the production process of a color coated aluminium coil because parts of it is not coated. It directly affects the appearance of color coated products and affects the performance of color coated products. At the same time, the corrosion resistance of the color coated board is also reduced, and the aluminum plate color coating product should have characteristics, so it is necessary to understand the cause of the leakage in the production process, so as to take measures to avoid and control the leakage defect.

　　4. The bump point leaks. The coating does not adhere to the aluminium sheet due to impurities on the raw material roll or the color coating line. It can be divided into two cases: pit leakage and bump leakage. The impurity material on the raw material may cause protrusion leakage after being coated. The solution is to check the cleaning quality of the raw materials before entering the paint after cleaning. However, when the aluminum coil is colored with impurities, a concave leakage coating is formed after coating. According to the distance between the impressions and the circumference of the rolls, it is possible to judge the leakage coating caused by the impurities on the rolls. The solution is to clean the rollers of the color coating line before starting production to prevent debris from appearing on the aluminum panel.

　　Haomei specializes in the production of colour coated aluminium coil rolls. It has an advanced color coating production line. The finished aluminum coils are bright in color, smooth in surface, strong in paint adhesion, good in corrosion resistance, and have good formability, used in steel structure factory buildings, exhibition centers, railway stations and other buildings.