Powder coating itself is only a semi-finished product, and only after spraying and curing can it truly become the final product. Consumers only focus on the effect and quality of the coating after coating, which means that the use of powder coating is equally important as the production of powder coating. Low quality powder, no matter how good the spraying equipment, how meticulous the pre-treatment, and how strict the coating process, will not produce high-quality products; No matter how good the powder quality is, if there are problems with the spraying equipment, process, and pre-treatment, there will still be no high-quality products. However, the reality is that most domestic coating companies focus on the powder coating products themselves, and when there are quality problems, they only look for problems on the powder, while not paying enough attention to and researching the coating construction process, resulting in a large number of coating products unable to achieve the expected effect.

Each powder coating has its own curing characteristic curve, which can achieve complete curing within a certain temperature and time range. In order to improve efficiency and reduce costs, it is not advisable to violate the rules and shorten the curing time. If the curing temperature or time is not enough, it will cause incomplete curing, and the expected performance will not be fully exerted. Its physical properties will be greatly reduced, and its chemical resistance will not be good. Its decorative, anti-corrosion, and weather resistance will not achieve the expected effect. Some coatings cured at low temperatures may not have as good performance as coatings cured at high temperatures even if they are completely cured. Especially for some workpieces formed after curing, small cracks may form at stamping and bending, and moisture will penetrate along the cracks, quickly causing corrosion of the substrate. We can see that outdoor traffic barriers will show rust marks at the curved corners of intersections shortly after being put into use, which is directly related to the baking temperature and time, as well as the bending after spraying.

Some people believe that a lower heating temperature can lower the reaction rate and improve leveling, but in fact, the opposite is true because after powder spraying, melting and solidification occur almost simultaneously. Heating is rapid, the temperature rises quickly, and the system viscosity decreases rapidly. The leveling process is already completed before gelation, resulting in better leveling of the board surface and less orange peel material. At the same time, the coating can wet the surface well, improve its adhesion, and have good durability. Due to rapid curing, there will be more internal stress in the film layer, but due to the thin coating, the impact of physical properties is minimal. On the contrary, if the heating is slow, the viscosity of the system always remains at a high level, and solidification has already begun. As the reaction progresses, the viscosity continues to increase, and the leveling effect will not be good.