Oil-free Screw Air Compressor Used in Spraying Industry

Spraying processes can be seen everywhere in life, such as the surface of car bodies, hardware and plastic products, etc. The main function is to prevent corrosion. Oil-free screw air compressor is often used to do power source in the spraying process. So the spraying industry has any requirements for air compressors?

Air spraying process, easy to operate, easy to change color, high production efficiency, good atomization effect, can get meticulous high-quality surface spraying. Since the compressed air is in direct contact with the paint, the compressed gas must be dry, clean, oil-free and water-free, so as to spray the quality. Below we will introduce in detail.

1. No impurities on the spraying surface

particle impurities are the natural enemies of spraying, and their presence will affect the appearance quality of the coating film. Especially in the advanced decorative product coating occasions, the paint must be smooth, no particles, bright as a mirror.

2. The spraying surface is free of oil and water

oil or water in compressed air can cause quality defects such as shrinkage, pinholes, bubbles, and pitting. Shrinkage not only affects the appearance quality of the coating film, but also destroys the integrity of the coating film, and cannot be eliminated by general grinding and polishing methods.

3. Constant pressure gas supply

during the spraying construction, the pressure of the compressed air of the screw air compressor must be kept within a certain range of control and cannot fluctuate greatly. If the air pressure is too low, the paint liquid will be insufficiently atomized and the paint film will be uneven. If the air pressure is too high, the paint liquid will be atomized well, but the paint mist will be too fast, resulting in increased paint loss. If the high-pressure air flow is sprayed on the uncured paint film, paint film defects such as pits and small bubbles will easily occur.

It can be seen that the air compressed by the ordinary screw air compressor must be processed before it can be used. The air compressed by an ordinary screw air compressor is a high-temperature gas containing oil, moisture and dust. In order to ensure the qualified rate of spraying, it is generally required that the pressure dew point of the air compressor is not higher than -40 ℃, the impurity is less than 0.5-1μm, and the oil content is not higher than 0.01 mg/m & sup3;.

Of course, the gas consumption of different spray guns is also different. Enterprises can reasonably configure Grantklin oil-free screw air compressor according to the actual situation.