The three elements of water-based paint spray gun spraying: spraying distance, operation trajectory, and spraying overlap are important factors that directly affect the spraying quality, and must be paid attention to during the usual operation.
1. Spraying distance
Spraying distance refers to the distance from the water-based spray gun nozzle to the object to be coated. The traditional air spraying distance is: 20-30cm for large spray guns and 15-25cm for small spray guns. The spraying distance of the electrostatic spray gun is generally 20-30cm. If the spraying distance is too short, the thickness of the coating film formed per unit time will easily cause sagging; if the spraying distance is too far, the coating film will be thin, and the loss of the coating will increase. In severe cases, the coating film will be dull.
2. The trajectory of the operation
The trajectory of the water-based paint spray gun operation needs to consider the spraying angle and the running speed of the spray gun. When spraying, the spray gun should be kept at right angles and parallel to the surface of the object to be coated. The moving speed of the spray gun is generally adjusted within the range of 30-60cm/s, and it is required to be constant. If the spray gun is inclined and runs in an arc trajectory or the running speed is variable, it is impossible to obtain a coating film with a uniform thickness, which is easy to cause problems such as blooming, orange peel and sagging of the coating film.
3. Atomization and spray pattern
The overlap width of the spray pattern should be kept constant. If the overlap width is variable, the film thickness is not uniform, and the coating film is prone to defects.
