Air spraying is currently a paint coating process, especially in the coating of furniture products. Air spray is a flow of compressed air, which flows through the nozzle hole of the spray gun to form a negative pressure. The negative pressure causes the paint to be sucked from the suction pipe and sprayed through the nozzle to form a paint mist. The paint spray is sprayed onto the surface of the painted component to form a uniform. Paint film.
1 characteristics of air spraying
Air spray can produce uniform paint, the coating is fine and smooth; even for the hidden parts of the parts (such as gaps, bumps), it can be sprayed evenly; the spraying production efficiency is high, the sprayable paint range is wide; the spraying can be mechanized, Automated, intelligent robotic coating; for the injection of larger parts or products (such as assembled American furniture), it can show its high efficiency coating advantage. However, the paint loss during spraying is large, the general paint utilization rate is 50-60%, and the rest of the paint and solvent are diffused into the air, polluting the environment. Spraying construction must use special spraying equipment and a specific workplace, which requires high requirements for the spraying construction environment.
2 basic technical requirements for air spraying
When air-spraying polyester or polyurethane resin coatings, the cleanliness of the spray system must be ensured, that is, the entire system from the air compressor to the spray gun must be free of water and oil-free. Otherwise, the incorporation of oil and water into the paint film will affect the quality of the finish. When spraying, the compressed air pressure cannot fluctuate and must be controlled within a certain range. Generally, the compressed air pressure should be controlled at 0.3-0.5MPa.
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