Why is the coating dried after finishing?
The process of gradually changing the liquid coating applied to the surface of the wood into a solid paint film is called drying or curing. It is a process that cannot be ignored in the paint process. Without a reasonable coating drying, it is impossible to obtain an excellent decorative protective paint film efficiently.
In order to protect the quality of the finish, all coatings, whether intermediate or final (including putty, coloring, filling, primer, topcoat and degreased bleaching and wetting of the wood), must be properly dried before proceeding. Process. If the coating is not dry properly, due to solvent evaporation or physicochemical changes during film formation, a series of defects or film damage may occur during film formation, which does not meet the expected surface decoration quality requirements. For example, when the putty, the filling paint, the hole-filling lacquer, and the primer layer are not dried, the coating on the top layer is whitened and wrinkled due to the effect of residual solvent in the primer and the effect of continuous shrinkage. Cracking.
According to the actual drying condition of the coating, the drying of the coating is divided into three stages: surface drying, actual drying and complete drying.
The dry surface of the coating is characterized by the fact that the liquid coating just forms a thin film of paint on which the dust particles are no longer stuck and can be blown away. Therefore, this drying stage is also often referred to as dust-proof drying. Or the touch is dry, but the coating is not dry and will leave marks when pressed on its surface.
The coating reaches the actual drying stage, which means that the film can be subjected to further grinding and polishing. At this time, the parts can be picked up completely, but the paint film has not dried up completely, and the painted products should not be used.
The coating is completely dry and the entire drying process is truly completed. At this time, the infiltration of the paint film stops. The protective decorative performance index that the paint film should meet is fully available, and the product can be put into use.
Playing Card Set,Playing Cards,Double Box Card,High Quality Playing Cards
Dongguan Senfutong Paper Co., Ltd , https://www.boardgamefty.com