The cleaning process in laser cleaning equipment relies on the light pulses generated by the laser, based on a photophysical reaction caused by the interaction between the high-intensity beam, the short-pulsed laser light and the contaminated layer.
How does laser cleaning equipment perform paint removal? To understand how laser cleaning removes paint, you need to understand the cleaning mechanism of laser cleaning equipment.
Paint applied to the metal surface is equivalent to a special layer of plasma, which protects the metal from corrosion and oxidation. And the plasma is generated only at energy densities higher than a threshold, which depends on the layer of contamination or oxidized layer being removed. This threshold effect is important for effective cleaning while keeping the substrate material safe. There is also a second threshold for the appearance of plasma. If the energy density exceeds this threshold, the substrate material is destroyed. For effective cleaning with safety of the substrate material, the laser parameters must be adjusted to the situation so that the energy density of the light pulses is strictly between the two thresholds.
Each laser pulse removes a certain thickness of contamination layer. If the contamination layer is thicker, more than one pulse is required for cleaning. The number of pulses required to clean the surface depends on the degree of surface contamination. An important consequence of the two thresholds is the self-control of the cleaning. Light pulses with an energy density higher than the first threshold will keep rejecting contaminants until they reach the substrate material. However, because its energy density is below the damage threshold of the substrate material, the substrate will not be damaged.
Based on the above, the use of laser cleaning equipment for cleaning paint on metal surfaces, the threshold is to control when the threshold is suitable for laser cleaning, when the threshold can not be set to the threshold that the laser cleaning equipment can not meet the requirements of the cleaning, which is why the laser cleaning equipment is not one of the reasons why the omnipotent, however, with the laser research and development of the deeper and deeper laser cleaning equipment is also more and more powerful, by that time! May reach the point where everything can be washed.
