Color coated aluminum coil defect cause

Color coated aluminum coil is prone to problems such as coating leakage, needle point color change and so on. The coating of color coated aluminum coil is one of the most critical processes in the whole aluminum plate and coil coating production line. The quality of coating products, especially the apparent quality, directly affects the decorative effect of products. Therefore, it is necessary to master the common defects and causes in the process of coating.
There are many reasons for the formation of defects, and the common ones are as follows:
1. Raw materials
Color coated aluminum coil coating and aluminum coil is the most influential factor in the coating process, due to the color difference between batches of paint, paint fineness is not enough and coating rate is not high, Coating and solvent with poor, stratification and so on will directly affect the coating effect and defects of the uneven aluminum coil substrate, film thickness is not uniform, side deflection is not good also directly affect the quality of the product and the overall use. Therefore, in the selection of raw materials, should be strictly controlled.
2. Equipment
The coating line of color coated aluminum coil requires that the coating equipment is in good condition, the coating equipment requires smooth operation, no transverse and longitudinal shaking, and the coating roller requires fine grinding. The transverse runout of all rollers of the coater must be controlled within the allowable range, otherwise the surface quality of the coating will be seriously affected.
3. Process
The coating process is closely related to the quality of the coating, so it is required to control the relative linear speed ratio of the coating roller, the paint lifting roller, the measuring roller and the substrate in a certain range. A certain viscosity range should be set according to different systems and film thickness of coating products to ensure smooth painting and improve product quality. Curing process of coating, oven control must be controlled according to the requirements, not arbitrary change, otherwise it will seriously affect the color difference and performance of coating products.
4. Environment
The coating room is required to be clean, dustproof, insect-proof and certain ventilation performance to ensure that the surface quality of the coating is not polluted. At the same time due to temperature changes and timely change of process conditions.
5. Human factors
Operator's responsibility, technical proficiency and operation of the standard, is the key to obtain high quality coating effect. Therefore, it is necessary to strengthen the training of the operator and let the operator master the principle and main points of painting technology, strengthen responsibility, operate strictly in accordance with the operating rules, in order to ensure high quality painting products.