Enamel Coating Process-Spray Coating Method
The spray coating process is now widely used on large blank workpieces, especially single-sided coating. In the spray coating method, the enamel slurry is pressed into a fine mist, which is sprayed by manual control, and sprayed onto the utensils. The general air pressure is about 4~6Kg/cm^2. The air should be paid attention to in the compressor, duct and filter. No oil or other impurities are allowed to enter the device.
The concentration of the spraying method is not as strict as that of the dipping method, but the adhesion amount is very important because it determines the thickness of the coating film after drying. In the spraying process, about 30-50% of the enamel slurry is lost, and it can be recycled and reused.
The most suitable distance between the spray gun and the vessel is 30-50 cm. When spraying, it should be perpendicular to the surface, and the moving direction of the spray gun should be parallel to the base layer to avoid ripples (orange peel). In order to reduce spray escape, when spraying the sun angle, spray vertically from top to bottom at the end first, and then spray horizontally. When spraying the shadow corners, do not spray directly at the corners, as this will make the coatings on both sides of the deep corners too thin, and the coatings on the outside of the corners will be too thick. In large factories, all large and flat or mass production can be produced by automated spraying.