Wooden door paint process 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. 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. Why is the wooden door easily deformed? The wooden door is one of the most decorative woods that are most prone to deformation and cracking due to the use of wood processing, large flat area, and few fixed points. Since the deformed wooden door will directly lead to the sound insulation, airtightness and beauty of the house, it is of great importance to understand the deformation of the wooden door. Natural wood has various factors in the growth process, resulting in uneven wood density (sunny surface, annual ring density, core material and sapwood). When the wood is shaved, the internal stress balance is changed. Deformation and cracking of wood. The high moisture content of wood is another major cause of deformation of the wooden door. As the water content decreases during use, the internal stress of the wood will slowly appear, eventually leading to deformation and cracking. The main means of preventing wood deformation is to use mechanical and technical methods to change the internal stress and water content of the wood. The most effective and most common way to change the internal stress is to finger-join the pine or Chinese fir (the two types of wood have less stress). . The method of changing the moisture content of the wood is to perform secondary drying (natural drying followed by steam drying). The quality of the processing in the production of wooden doors, such as pressure, temperature, balance layer, gluing and other factors of the press will directly affect whether the wooden door is deformed or cracked during use.
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