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Laser Cleaning Machine Principle And Application
Jun 12, 2018

Laser Scrubbing Traditional scrubs have a variety of cleaning methods, mostly using chemical agents and mechanical methods for cleaning. Under the increasingly stringent environmental protection regulations in China, and people’s growing awareness of environmental protection and safety, the types of chemicals that can be used in industrial production and cleaning will become less and less.

Finding cleaner and non-invasive cleaning methods is a problem we have to consider. Laser cleaning is characterized by no cleaning, non-contact, non-thermal effects and objects suitable for various materials. It is considered to be the most reliable and most effective solution. At the same time, laser cleaning can solve traditional cleaning methods Unsolvable problem

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Laser cleaning principle

The pulsed Nd:YAG laser cleaning process relies on the characteristics of the light pulses generated by the laser, based on the photophysical reaction caused by the interaction between the high-intensity beam, the short-pulse laser, and the contamination layer. The physical principle can be summarized as follows

a. The beam emitted by the laser is absorbed by the contamination layer on the surface to be treated

b. Absorption of large energy forms a rapidly expanding plasma (highly ionized unstable gas), generating shock waves.

c. Shockwaves contaminate and remove contaminants.

d. The width of the light pulse must be short enough to avoid heat build-up that destroys the treated surface.

e. Experiments show that when an oxide is present on the metal surface, plasma is generated on the metal surface

The plasma is generated only when the energy density is above the threshold, which depends on the contaminant layer or oxide layer removed. This threshold effect is very important for the effective cleaning of the base material. There is a second threshold for the presence of plasma. If the energy density exceeds this threshold, the base material will be destroyed. In order to perform effective cleaning on the premise of ensuring the safety of the base material, the laser parameters must be adjusted according to the situation so that the energy density of the light pulse is strictly between two thresholds.

Each laser pulse removes a defined thickness of the contamination layer. If the contamination layer is thick, multiple pulses are required for cleaning. The number of pulses needed to clean the surface depends on the degree of surface contamination. Generated by two thresholds - one important result is the self-control of cleaning. Light pulses with an energy density higher than the first threshold will directly reject contaminants until the substrate material is reached. However, because its energy density is lower than the damage threshold of the base material, the base is not damaged.

Laser cleaning machine rust removal 200w 500w