Seven issues to pay attention to in the spray booth during painting processing

Seven issues to pay attention to in the spray booth during painting processing

The production of powder coating in the spraying room is a key process in the spraying production process. The key to the surface quality of sprayed profiles lies in the control of various process parameters during the spraying process. Powder output and atomization air volume are two key technical indicators. Try spraying a few times before the official powder coating. At this point, the size of the powder amount and the uniformity of the powder distribution can be observed at both ends of the spraying room. At this time, the powder runs in a straight line within a range of 10cm-15cm from the end of the spray gun, and the external part exists in the form of atomized powder. The powder adsorbed on the surface of the profile is actually the powder with this atomization effect. Control the distance between the spray gun and the profile based on whether there is powder with this atomization effect.

(1) Spray gun position

The spray gun should maintain a certain inclination and tilt towards the direction of the profile's movement. The spray gun should be arranged vertically and parallel, and the end should be kept in a straight line. There should be no overlap between the spray guns. The position of the upper and lower spray guns should be such that the powder covers all profiles.

(2) Fluid pressure control

The function of fluidized bed is to use the action of airflow to form an appropriate fluidized state of powder. The feeling of hands is similar to the state of liquid flow. The simple operation is to detect that fluidization has reached a sufficient state. When stirring powder with hands or sticks, there is no sensation of resistance. Fluidization facilitates the suction of powder into pipelines. Under the action of accelerating wind, atomization effect will be generated. Insufficient or excessive pressure will lead to insufficient fluidization.

(3) Powder recycling and reuse

The powder adsorbed on the surface of the profile only accounts for about one-third of the total powder production of all spray guns. During the spraying process, there is a large amount of powder scattered in the spray chamber. The recycled powder must be mixed with the newly added powder in appropriate proportions to achieve good results. Therefore, the powder should be promptly recycled.

(4) Spray room sealing

Powder is easily contaminated by suspended solids in the external air. After powder coating, the surface of the profile is prone to coagulation or shrinkage, which affects the flatness of the baked profile surface. Therefore, the spraying room should be closed to prevent the invasion of pollutants.

(5) Residual powder in the trachea should be cleaned up in a timely manner. If not used for a long time, it is easy to clump and powder is prone to spitting out, which affects the spraying effect.

(6) Spare powder bucket

When used for powder exchange, it can effectively improve labor efficiency. It is necessary to maintain the dust and moisture prevention of the spare powder bucket, and the spraying process must ensure the quality of the remaining powder in the powder bucket.

(7) In addition, attention should also be paid to the work of supplementing powder

Although the technical parameters for spraying treatment have been debugged before normal production, it is still necessary to continuously monitor the profile through the powder replenishment window from time to time, and timely replenish powder in areas where the powder is shallow or not adsorbed.