1. Improve control standards For those customers with extremely high color differences (such as ΔE ≤ 0.4) or products with slight chromatic aberration but significant visual changes (such as light colors with red or yellow), quality control standards must be improved and visual inspections must be strengthened. General product companies control the color difference ΔE ≤ 1, part of ΔE ≤ 0.5, and most of them are under a single light source, it is easy to cause visual chromatic aberration. In order to strengthen the control, it is necessary to require the uniformity of the color difference under various light sources (such as ΔE ≤ 0.5), and also to pass the inspection, proofreading, and visual inspection of the auditors to achieve consistent qualification. 2. Increase the amount of raw materials purchased Even the products of large-scale raw material manufacturers, especially pigments, are generally chromatic aberrations between batches. The color of some powder coating products is particularly sensitive to them, and the on-site coloring staff can't guarantee the color consistent with the previous efforts. Raw material suppliers recommend that powder manufacturers increase the amount of single-batch purchases to ensure consistent color of multiple batches of products, which has certain improvement effects. It is also necessary for some important customers and important control products to take such measures. 3. Product inventory The order of the coating customer is determined according to the batch processing of the workpiece. Many customers have fewer orders in a single batch, which brings difficulties to the production and quality control of the powder coating. For those customers who use the same product all the year round and can't over-order in batches, powder coating manufacturers may wish to do a lot of mass production on the basis of sufficient argumentation, and do a good job in product inventory. Coating customers also recommend and welcome this practice. 4. Strengthen technical services The appearance of color difference generally requires after-sales technical service work, and the pre-sales technical service can well reduce the occurrence of chromatic aberration. The slight fluctuation of the color, the customer is basically acceptable, but the continuous fluctuations or deviations will cause strong complaints from customers. Regular visits and advanced communication can quickly identify problems and correct them in time. For those products whose color difference is too large and the customer refuses to use, they should be quickly exchanged; when the paint and molding used by the customer are fluctuating, it is necessary to communicate with the customer in time to avoid excessive deviation of the customer according to the standard (many customers) Will take the paint, molding products to request the color of the powder coating); timely visits can also keep abreast of customer information, and actively adjust the product to meet customer needs. 5. Reasonable construction of pigment library The fundamental problem in solving the chromatic aberration is the complete variety of pigments. However, the comprehensive establishment of the pigment library requires a lot of manpower, material resources and financial resources. It is a long-term and continuous process, and it cannot guarantee that it will fully meet the business needs of the enterprise. A small order will bear the risk that the entire package of new pigments may remain in storage for several years. The infinite number of pigments in the theory of color matching is indeed a great contradiction with the limited stock in practice. The first method of coordination is to enrich the pigment varieties, such as green pigments, to have a yellowish phase, blue phase, red to have orange red and purple, etc.; second, complete specifications, such as high quality and low price, high quality and high quality, domestic and foreign Lead-free, lead-free, etc.; third, special goods, for the large-volume, high-profit or important customers, such as the need for pigments, positive selection of spare; fourth is technical reserves, for some special pigments (such as high prices, Excellent quality, special needs or new varieties), sampling, storage or trial. 6. Conclusion Color matching and quality control are the most basic and important technical tasks in the production of powder coatings. At present, many companies are still using low-efficiency pure manual operations, and some have begun to use the aid of colorimeter, while the main domestic powder coating companies The color matching technology is only in the hands of a few key technicians, and the quality inspection personnel in the production line only use the visual inspection to fine-tune the color of the product. However, with the continuous development of powder coating, many managers have gradually realized the efficiency and quality assurance brought by the color matching instrument. The use of the color measuring instrument will gradually become popular, and the technicians only have the instrument matching technology. Visual judgment, practical experience, etc. can be combined to achieve true color measurement and control of powder coating products. 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