The technique of air spraying for metal and plastic coating in Dalian:

The technique of air spraying for metal and plastic coating in Dalian:

The air discharged by a regular fuel injection air compressor cannot be directly used by pneumatic devices. The air compressor sucks in air containing moisture and dust from the atmosphere, and after compression, the temperature of the air increases to about 140 ℃~170 ℃. At this time, some of the lubricating oil in the air compressor also becomes gaseous. In this way, the compressed air discharged by the air compressor is a high-temperature gas containing oil, moisture, and dust.

The finer the atomized particles of the coating, the better the atomization effect, and the better the appearance quality of the coating. When the ratio of air consumption to paint output is small, increasing the air consumption or decreasing the paint output will significantly improve the atomization effect. Increasing the air volume can be achieved by increasing the air pressure, but it should be noted that higher air pressure will cause more severe paint mist to scatter.

Techniques for air spraying

(1) Gently wrap the ring finger and little finger around the gun handle, hook the trigger with the index and middle fingers, and clamp the gun handle in the tiger's mouth; When spraying, keep an eye on the condition of the coating and the landing point of the paint mist as the spray gun moves; The spraying distance and perpendicularity between the nozzle and the workpiece are controlled by the body. When the spray gun moves, the body should cooperate with the movement of the arm, and the wrist should not be moved, but the wrist should remain flexible.

(2) When the spray gun is running, it should be kept at a right angle to the surface of the object being coated, and the gun should be kept parallel at all times; The movement speed of the spray gun is generally controlled within 0.3-0.6m/s, and it should be kept at a constant speed as much as possible, otherwise it may cause uneven thickness of the paint film and other phenomena; The distance between the spray gun and the coated surface should be between 0.2-0.3m; Too close, the paint film is prone to uneven thickness, uneven drying speed, and surface sagging; Too far away, the solvent of the paint evaporates heavily in the paint mist, causing orange peel phenomenon.

(3) When spraying, the edge of each spraying amplitude should be repeated by 1/3-1/2 on the edge of the previously sprayed amplitude (i.e. the cross-sectional width or area of the overlap between two paint marks), and the overlap width should be consistent, otherwise the paint film thickness may be uneven, and stripes or spots may sometimes appear.

Dalian Metal Plastic Coating Plastic Surface Coating and Coating Technology has rapidly developed as a new industry. From general decorative to special functional, from solvent based to water-based.

In the field of home appliances, plastic materials can be used as casings for almost all household appliances such as mobile phones, computers, televisions, washing machines, audio equipment, cameras, air conditioners, etc.