1. Improve control standards
For those customers with extremely high requirements for color difference (such as ΔE≤0.4) or products with slight color difference but significant visual changes (such as reddish or yellowish light color), it is necessary to improve the quality control standard and strengthen visual inspection. General product companies control the color difference ΔE≤1, some are ΔE≤0.5, and most of them are under a single light source, which can easily cause obvious visual color difference. In order to strengthen the control, it is necessary to require the consistency of the color difference under various light sources (such as ΔE≤0.5), and it is also necessary to pass the inspection, proofreading, and visual inspection of the auditors to achieve consistency.
2. Increase the batch of raw material procurement
Even the products of large-scale raw material manufacturers, especially the pigments, generally have batch-to-batch color differences. The color of some powder coating products is particularly sensitive to it. Even if the on-site colorists try their best, they cannot guarantee the same color as before. Raw material suppliers suggest that powder manufacturers increase the purchase quantity of a single batch to ensure that the color of multiple batches of products is consistent, which has a certain improvement effect. For some important customers and important control products, it is also necessary to take this measure.
3. Product inventory
Coating customer orders are determined according to the workpiece processing batches, and many customers order less in a single batch, which brings difficulties to the production and quality control of powder coatings. For those customers who use the same product all the year round and cannot place an overorder in a single batch, powder coating manufacturers may wish to produce in small batches and mass production on the basis of sufficient demonstration, and keep a good product inventory. Coating customers also recommend and welcome this approach.
4. Strengthen technical services
Chromatic aberration generally requires after-sales technical service work, while pre-sales technical service can well reduce the occurrence of chromatic aberration problems. Slight fluctuations in color are basically acceptable to customers, but continuous fluctuations or expanding deviations will cause strong complaints from customers. Regular visits and advanced communication can quickly discover problems and correct them in time. For those products whose color difference is too large and customers refuse to use, they must be replaced quickly; when the color fluctuations of the coatings and moldings used by customers, it is necessary to communicate with customers in time to avoid excessive deviation of customers based on standards (many customers Will use coatings and molded products to request the color of powder coatings); timely visits can also keep abreast of customer information, and actively adjust products to meet customer needs.
5. Reasonable construction of pigment library
The fundamental problem to solve the color difference lies in the complete range of pigments, but the establishment of a comprehensive pigment library requires a lot of manpower, material and financial resources. Small orders carry the risk that entire packages of new pigments may be in stock for several years. There is indeed a big contradiction between the infinite number of pigments in color matching theory and the limited inventory in reality. The coordination method is first to enrich the variety of pigments, such as green pigments, which must have yellowish and blue phases, and reds must have orange red and purple red; the second is complete specifications, such as high quality and low price, high price good, domestic and foreign pigments. , lead-free, etc.; the third is special goods, for pigments that have large sales volume, high profits or important customers, etc., actively select samples for backup; the fourth is technical reserves, for some special pigments (such as high prices, Excellent quality, special needs or new varieties), for sampling, storage or trial.
Summarize
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 rely on the assistance of Colorimeters. The technology is only in the hands of a few key technicians, and the quality inspectors in the production line only use visual inspection to fine-tune the product color. However, with the continuous development of powder coatings, many managers have gradually realized the effectiveness and quality assurance brought by the color matching instrument to the enterprise, and the use of color measuring instruments will gradually become popular. Only by fully combining visual evaluation and practical experience can we really do a good job in the color measurement and control of powder coating products.
