Selective spraying: The coating is accurate and does not waste materials. It is mainly used in medium and large equipment. The coating device is usually very expensive and requires high maintenance. The thickness of the coating is affected by four factors: COATINGE properties, temperature, pressure and the design structure of the device. Selective coating can be used for medium to large range applications. It is usually not necessary to seal, because the paint is only used in selected areas of the circuit. The operating equipment it uses is more expensive than the equipment used in general large-scale operations and requires higher maintenance costs than dip coating and spraying. The viscosity, temperature, pressure and structure of the dispersing head will affect the thickness of the coating.
Automatic spraying of three-proof paint on the whole board: The spray can type product can be easily applied to maintenance and small-scale production. The spray gun is suitable for large-scale production and is an economical way for medium-sized equipment. The protective mold layer is easier to form, but the bottom of the component is difficult to coat, so it needs to be processed again. The thickness of the coating is affected by the linear relative moving speed, the temperature of the material, and the pressure of the spraying device. Spraying is usually used for medium batch production, with high production rate and low production cost. Spraying is difficult to apply under the components and requires more maintenance. The type of feeding system, line speed, material temperature and atomization pressure used will affect the thickness of the application.
