When we communicate with the wooden door enterprise CEO, sales staff, production management personnel, we often hear the reflection: the wooden door that has just been produced has a good surface effect. After being placed for a while, it is found that the surface effect of the product is not good, and the gloss is also good. The weakening, the surface layer is not so flat, what is the problem? In fact, the reason for all this is: the surface of the coating is sunken. Why is the coated surface of the coated product sagged? There are two reasons for this: First, after the paint is sprayed, it takes a long time to dry completely. Generally, the furniture factory and the wooden door factory only wait for three or four hours. In the case of sanding, in fact, the paint is not completely dry at this time, the residual solvent will continue to volatilize, and the paint film itself will continue to shrink. If the product is already ready, it will naturally affect the surface effect of the product; All the materials will be drooped by the gravity of the Earth's center of gravity, so the paint layer after film formation will gradually sink as long as the underlying material (solid wood, veneer) has not been filled with wood, and the high-hardness paint layer will sink slowly. And the softer paint layer will sink faster. Paint is used as a post-process for the processing of the wooden door factory. Its advantages and disadvantages directly affect the final use effect. At the same time, the cost of paint is also one of the largest parts of the cost of wooden doors. The types of paints are broadly classified into phenolic paints, alkyd paints, polyurethane paints, nitrocellulose paints, polyester paints and PU paints. Among them, phenolic paint and alkyd paint are basically eliminated in the decoration due to the poor texture and adhesion of the paint film. A large number of PU paints used in lacquer, polyester paint and high-grade furniture are used. Due to the simple construction and suitable for manual operation, the nitrocellulose lacquer is used by most hand-decorated woods, but its paint film is thin, the hand feel is not good, and the effect is not satisfactory. Polyester paint is relatively thick, but its thinner contains helium when it is volatilized, and the film hardness is slightly weaker. The most ideal is PU paint. PU paint not only has the thick paint film of polyester paint, but also has strong adhesion and good transparent layer. At the same time, its good sealing property also plays an important role in the moisture-proof of wood. Hardness, durability, yellowing resistance and environmental friendliness are unmatched by Other paints. PU paint is the most high-grade paint used in the current wood tools. The construction process is more complicated. It requires advanced dust removal equipment, UV curing equipment, etc. It can not be done by hand. Generally, it is three times of primer and two times of paint-free. PU paint is more environmentally friendly than other paints (no helium, very low benzene content), good adhesion, high hardness and strong transparency. Due to the cost (nitrocellulose lacquer 8-15 yuan / kg, polyester paint 18-28 yuan / kg, PU paint 43--65 yuan / kg), processing methods and equipment problems, currently 90% of the market's wooden doors used Polyester paint, a few manufacturers use PU paint. In general, polyester paints and PU paints have to go through six processes, such as color finding, three bottoms and two sides. Some brands increase the curing and waxing process. Therefore, paint is one of the factors that must be considered when choosing a wooden door. It directly affects the texture, feel, moisture, environmental protection, durability, and yellowing resistance. Ningbo Kyson Cool Electronic Technology Co., Ltd. , https://www.kysoncool.com