Firstly, the spraying voltage and current have a direct impact on the film thickness. During the electrostatic spraying process, the powder coating is adsorbed on the surface of the workpiece by static electricity to form a coating. Excessive voltage can cause the phenomenon of



Secondly, the spraying distance and angle are also important factors affecting the film thickness. The distance between the spray gun and the workpiece should generally be controlled between 15-30 cm. Too close a distance can cause uneven thickness or excessive coating, even resulting in dripping; too far a distance will reduce the powder deposition efficiency, leading to thin film thickness. At the same time, the spray gun should be kept perpendicular to the surface of the workpiece to ensure uniform distribution of the powder.



Thirdly, the particle size of the powder and its fluidity will also affect the film thickness of the coating. Fine particle size powder is easier to uniformly adhere to the surface of the workpiece and is suitable for thin coatings; coarse particle size powder is more suitable for thick coatings, but it may be difficult to cover in the edges or grooves. Therefore, appropriate powder particle size should be selected according to product requirements, and the fluidity of the powder should be regularly checked to ensure the stability of the spraying process.



In addition, the powder supply pressure and atomization effect are also key factors in controlling the film thickness. Excessive supply pressure can lead to excessive dispersion of powder, affecting the powder deposition rate; insufficient pressure will cause poor powder conveyance, resulting in uneven film thickness. Generally, the pressure should be adjusted according to the equipment model and powder characteristics to ensure uniform atomization of the powder during the spraying process.



Finally, the experience and operational specifications of the operators should not be neglected. Skilled operators can flexibly adjust the speed and path of the spray gun according to the structure and shape complexity of the workpiece, avoiding phenomena such as uneven thickness or over-thickness. At the same time, regular detection of the film thickness, using thickness gauges for quality control, helps to discover and adjust parameters in a timely manner.



In summary, the control of film thickness during powder coating is a systematic project, involving many aspects such as equipment parameters, powder properties, and operation skills. Only by constantly summarizing experience and optimizing the process in practice can we achieve precise control of the film thickness, thereby improving product quality and market competitiveness.