2) Technical requirements of spray booth. ① The air entering the spray booth must be strictly filtered to ensure that there is no dust in the air. (2) the direction of air flow in the painting room must be from the ceiling to the ground along the direction of gravity, and the air is discharged from the ground and filtered into clean air. (3) Ensure that the indoor air is ventilated twice per minute, so the indoor air speed should be 0.3-0.6/s. If the air speed is too high, the paint will be lost too much, the coating will be in poor condition and the air speed will be too low, which will affect the normal volatilization of the solvent. ④ Good lighting conditions. ⑤ Ensure that there is no negative pressure in the painting room. It can be achieved by controlling the air intake and exhaust, and the air intake into the spray booth is slightly more than the air exhaust. ⑥ The working noise in the painting room is not allowed to exceed 85dB. All landowners meet the requirements of fire prevention.
3) Classification of spray booth. According to the different ways of removing paint mist and preventing dust from mixing, the spray booth can be divided into dry and wet types. ① Dry spray booth. Dry spray booth is mainly composed of box, filter, exhaust pipe and ventilator. It has the characteristics of simple structure, low coating loss, high coating efficiency, less water treatment equipment and low cost, and is widely used by small and medium-sized repair enterprises in China. ② Wet spray booth. Wet spray booth is divided into four types: spray booth, water curtain booth, text booth and rotary booth. For the painting of top-grade automobile topcoat, Wen-style or water-spraying spray booth is mostly used abroad, but it is rarely used in China.
4) Maintenance of spray booth. (1) All preparations before painting shall be carried out outside the painting room. ② The filter must be checked frequently and replaced at the specified time. (3) Check the barometer reading every day to master the range of air pressure in the painting room. Negative pressure is strictly prohibited. (4) Dry spray booth should wet the ground before spraying construction to prevent dust. ⑤ Check the lighting regularly and replace the weakened or burned lamps. ⑥ Regularly lubricate and maintain the exhaust fan and motor. ⑦ Pay attention to personal hygiene, and it is forbidden to enter the spray booth wearing dirty clothes. ⑧ After each painting operation, it should be thoroughly cleaned, and the related equipment in the painting room should be maintained and cleaned.