_{Laser Cleaning}

Traditional industrial cleaning mainly use the chemical and mechanical. With the development of environment protection and people had realized the safety production and environmental friendly,the chemical cleaning had been gradually disused.so we have to find the substitute cleaning which will be more environment friendly. The laser cleaning has the advantage of non-contact,non-grinding,non-athermic effect and suitable for any material,will be accepted the most reliable and effective solution. As well as the laser cleaning can solve a lot of problems that traditional cleaning can't solve.

For example, when the surface of the workpiece is stuck to submicron pollution particles, these particles are often stuck very tightly, and the conventional cleaning method cannot remove it, and the surface of workpiece is cleaned with nanometer laser radiation. As the laser is non-contact cleaning with the workpiece, it will be more safe to clean the precision workpiece or its fine parts and its accuracy can be ensured.2

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Why the laser can be used for cleaning and keep the workpiece safe? Let's learn the laser essence firstly. In general, laser will be no different from the light(visible and invisible) that surrounds us, just laser is the use of a resonator to gather light in the same direction, and has a simpler wavelength, better coordination, so theoretically all wavelengths of light can be used to form a laser, but in fact,limited by the medium that can be excited, so the laser light source that can produce stability and suitable for industrial production is quite limited. The most widely used are probably Nd: YAG lasers, carbon dioxide lasers and excimer lasers. Because Nd:YAG lasers can be transmitted through optical fibers and are more suitable for industrial application. They are also used in the laser cleaning

Main Cleaning Method:

Laser dry cleaning, using the pulse laser radiation decontaminated directly

Laser+ liquid film, first deposit a layer of liquid film on the surface of the substrate, and then use laser radiation to decontaminate

Laser + inert gas, at the same time of laser radiation, the inert gas is blown to the substrate surface, and when the dirt is stripped from the surface, it will be immediately blown away from the surface by the gas to avoid surface contamination and oxidation again

After the dirt is loosened by the laser, it is cleaned by non-corrosive chemical. This is mainly used for stone historical relics cleaning.