Laser cleaning: How does laser cleaning remove paint?

Source:Chengjing laser Author:Laser Chenxing Release time:2023-08-22 10:48:30 Number of visits:601

The cleaning process of laser cleaning equipment depends on the optical pulses generated by the laser, based on the photophysical reactions caused by the interaction between high-intensity beams, short pulse lasers, and pollution layers.

Laser cleaning equipment plays an important role in many industries, such as automotive manufacturing, semiconductor wafer cleaning, precision parts processing and manufacturing, building exterior wall cleaning, cultural relic protection, circuit board cleaning, precision parts processing and manufacturing, LCD display cleaning, gum residue removal, grease removal, paint removal, and so on.


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How does laser cleaning equipment remove paint? To understand how laser cleaning removes paint, one must first understand the cleaning mechanism of laser cleaning equipment.

The paint applied to the metal surface is like a special layer of plasma, protecting the metal from corrosion and oxidation. And plasma is only generated when the energy density is above the threshold, which depends on the removed pollution layer or oxide layer. This threshold effect is crucial for effective cleaning while ensuring the safety of the substrate material. There is a second threshold for the appearance of plasma. If the energy density exceeds this threshold, the substrate material will be destroyed. To achieve effective cleaning while ensuring the safety of the substrate material, it is necessary to adjust the laser parameters according to the situation, so that the energy density of the light pulse is strictly between two thresholds.

Each laser pulse removes a certain thickness of contamination layer. If the pollution layer is thick, multiple pulses are needed for cleaning. The number of pulses required to clean the surface depends on the degree of surface contamination. An important result generated by two thresholds is the self-control of cleaning. Light pulses with energy density higher than the first threshold will continuously remove pollutants until they reach the substrate material. However, because its energy density is lower than the failure threshold of the substrate material, the substrate will not be damaged.

Based on the above, when using laser cleaning equipment to clean paint on metal surfaces, the threshold must be controlled properly before laser cleaning can be carried out. When the threshold cannot be set, it indicates that the laser cleaning equipment cannot meet the cleaning requirements. This is one of the reasons why laser cleaning equipment is not universal. However, with the continuous deepening of laser research and development, the functions of laser cleaning equipment have become increasingly powerful, At that time, it may reach the point where everything can be washed.

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