With the further development and maturity of laser marking technology, laser marking anti-counterfeiting technology is also increasingly widely used in medical devices and drug markets. Now more and more companies have entered the ranks of mask machine production. However, at the same time, some fake masks appeared. In order to mark unique and anti-counterfeiting marks on masks, many large manufacturers now use laser mask marking machines to mark masks. So, how to choose the laser marking machine correctly? Choose CO2, UV or optical fiber as the light source type?

The working principle of the laser mask marking machine is that the laser generator generates a high-energy continuous laser beam. The focused laser acts on the printing material, making the surface material melt or even vaporize immediately. Then, by controlling the path of the laser on the surface of the material, the required graphic markers can be formed. Laser marking machine has good spot and high beam quality. It can print various patterns and logos. The minimum mark character is 0.01mm, which is a true "high-precision" processing. Different laser beams (CO2/optical fiber/UV/green light, etc.) have different effects on different materials. After repeated tests by engineers of Chuyu Laser Group, we found that the UV laser mask marking machine has the best coding and lettering effect for KN95/N95 masks. As the fiber laser only acts on metal and other materials, its wavelength cannot be absorbed by the melt blown cloth, so it has no effect. The carbon dioxide spots are relatively thick and will burn through the melt blown cloth, so the effect is not good. The best mark is UV. When ultraviolet laser acts on polymer materials such as PI, it can directly destroy the chemical bond of the material, so that the material fragments can be discharged in the form of small particles or gases, so as to achieve the purpose of stripping and removing materials. Material Science. Since most of the energy is used to destroy chemical bonds, almost no energy is converted into heat energy, thus basically eliminating the changes in the heat affected zone and surrounding materials. For most white plastics (the pigment is TiO2), TiO2 will strongly absorb ultraviolet light and change the crystal structure. This change will make the material in the corresponding area appear darker, thus forming smooth and clear marks inside the material.