In the early stage of development, powder coating was mainly used for metal corrosion protection. With the continuous progress of powder coating production and application technology and the strengthening of environmental protection awareness and regulations all over the world, the application scope of powder coating has been expanding, and the decorative and beautifying effect of powder coating has attracted more and more attention, The assembly line processing and assembly of modern enterprises (such as refrigerators, air conditioners, instruments and meters, metal doors and windows, aluminum profiles, electromechanical equipment and other manufacturers) requires a high degree of stability in the internal and external quality of coating products. The consistency of coating color between batches has become an important requirement of customers.

Powder coating generally atomizes the electrostatic powder coating into fine and uniform under the action of compressed air, evenly adsorbs on the surface of metal workpiece by virtue of high-voltage electric field, and solidifies into film at high temperature. Among them, curing time and baking temperature are the most influential factors on the color difference of finished products.
For example, the curing device of gas furnace has moderate production cost and is suitable for coating workpieces of individual enterprises. However, there is nitrogen oxide in the baking process of gas furnace, which will cause serious yellowing of the cured coating of powder coating and bring great trouble to manufacturers.
The CHNSpec colorimeter can monitor the influence of baking temperature and curing time on color difference.

By recording the relationship between the data of color change and curing time and baking temperature, we can understand the influence of curing time and baking temperature on color difference, so as to solve the problem of color difference of finished products.

Each powder coating has its own curing characteristic curve, which can achieve complete curing in a certain temperature and time range. The CHNSpec color difference instrument can record the color information and color difference value of the finished product, which is convenient for everyone to monitor the color difference of the coating color.