Principles and advantages of laser cleaning technology（2）–Winnie
Laser cleaning has the characteristics of no grinding. Non-contact, no thermal effect and suitable for objects of various materials, etc. And is considered to be the most reliable and effective solution.
1 Laser cleaning principle
Laser irradiation on the surface of the object to be cleaned can produce at least three effects:
(1) Thermal expansion effect
That is, the difference in absorption coefficient of a certain wavelength of laser energy between the substrate and surface contaminants is used to cause the substrate material and surface dirt to absorb energy to generate thermal expansion. When the expansion force of the dirt is greater than the adsorption force of the dirt on the substrate. The dirt will separate from the object surface;
(2) Photolysis or phase change of molecules
The laser can achieve a high concentration of energy in time and space. The focused laser beam can produce high temperatures of thousands of degrees or even tens of thousands of degrees near the focus. Causing the dirt to evaporate, vaporize or decompose instantly;
(3) Vibration of laser pulse
The high-frequency pulse laser use to irradiate the surface to clean. The laser beam can generate ultrasonic vibration on the solid surface to generate mechanical resonance to vibrate the dirt layer or condensate.
2 Advantages of laser cleaning
More environmentally friendly: No chemicals or cleaning fluids need. Firstly the cleaned waste is basically solid powder, small in size, easy to store, recyclable, and non-photochemical reaction, and no pollution.
Good effect: laser cleaning has no grinding, non-contact, no thermal effect, will not produce mechanical force on the object to clean, will not damage the surface of the object, will not damage the substrate, and will not produce secondary
Easy to control: The laser can transmitte through the optical fiber, cooperate with the robot to achieve long-distance operation, and can clean the complicated parts that are difficult to reach by traditional methods. Finally this feature also makes the safety of the operator in some dangerous places more secure.
Widely used: laser cleaning can remove various types of contaminants on the surface of various materials. Then achieving a degree of cleanliness that cannot achieve by conventional cleaning. So it can also selectively clean contaminants on the surface of the material without damaging the surface of the material.
Low cost: The initial investment of the laser cleaning system is high, but it also can use stably for a long time. And the service life is up to 10 years. The operating cost is low. The speed is fast, the efficiency is high, the time is save, and the return on investment can quickly obtaine. In the long run, so the cost ratio Traditional cleaning methods are lower.
