Compressed air is indispensable in the cleaning process of the recovery system of the spray room. With the improvement of the automation level of the equipment, the use of compressed air is also increasing, such as automatic powder recovery, cleaning when the spray room changes color, instant cleaning and recovery of the powder at the bottom of the spray room, cleaning of the filter element, automatic cleaning of the powder supply pipe of the spray gun in the powder supply center, etc The efficiency of the equipment is further improved by adding the function, but at the same time, many bad problems of spraying products are also directly related to the compressed air, such as shrinkage cavity, bubbles, recycled powder agglomeration, etc., which are greatly related to the water content or oil exceeding the standard in the compressed air. Therefore, the quality of compressed air in powder spraying system is very important. There are many ways to ensure the stability of compressed air quality, such as using adsorption dryer and adding high-precision air filter, and the cost is not very much!