After understanding the cleaning process of laser cleaning machine, you also need to understand the principle of paint. The paint applied to the metal surface is equivalent to a special layer of plasma that protects the metal from corrosion and oxidation. The plasma is generated only when the energy density is above a threshold, depending on the layer of contamination or oxidation removed. Each laser pulse removes a certain thickness of the contamination layer. If the contamination layer is thick, several pulses are required for cleaning. The number of pulses required to clean the surface depends on the degree of surface contamination. An important result of these two thresholds is the self-control of cleaning. Light pulses with energy density higher than the threshold will remove contamination until the substrate is reached. However, the substrate will not be damaged because its energy density is below the failure threshold of the substrate material. Based on the above, when using laser cleaning equipment to clean metal surface paint, the threshold value should be controlled. When the threshold value is not appropriate, laser cleaning equipment can not meet the cleaning requirements. However, with the depth of laser research and development, laser cleaning machine will become more and more perfect, I believe that in the future, the laser cleaning machine will be more widely used in the application level.