Laser marking machine realizes color marking on stainless steel surface

Laser marking technology has led domestic enterprises to enter the laser processing industry, especially after fiber lasers are widely used in laser equipment, the laser marking industry has also reached the “peak” of the market. However, since the application of laser marking for many years, we have seen that the common laser marking patterns are black-and-white and gray. As for the current laser marking process, only some fiber lasers can be used to realize color marking on stainless steel.

Stainless steel color mark To mark such a visual effect, in addition to inkjet and color paint, you can also use the technology of MOPA pulsed fiber laser, a laser whose pulse width and frequency can be adjusted independently of each other. When laser marks stainless steel materials, the color change of the material surface layer can be changed by adjusting the laser beam, so as to obtain different decorative effects. Its advantage is that its pulse width and frequency are independently adjustable. Adjusting one of them will not affect other laser parameters, which is not available for Q-switched lasers. This characteristic brings infinite possibilities for color marking of stainless steel. In the actual marking operation, pulse width, frequency, power, speed, filling mode, filling spacing, delay parameters and other factors will affect the color effect. However, because the technology is not very mature, it is still subject to many limitations, and the price is unacceptable to most manufacturers. Because a color laser cutting machine can buy several laser marking machines. New technology of laser color marking Recently, Germany has developed a laminate group, which includes an external laminate and an internal laminate. The external laminate includes a transparent polymer carrier. On one side of the carrier, there is a color laser markable layer containing infrared dye with maximum absorption in the infrared region. This laminate can be used for almost all common marking materials, This technical advantage should be different from ordinary laser paper on the market. A composition that can be used for laser color marking and a preparation method thereof have also appeared in Japan. The composition comprises: 100 parts by weight of polymer; The content of laser marking powder is 0.05622 parts by weight; The content of temperature sensitive substance is 0.16210 parts by weight. The preparation method comprises: melt blending the components including the polymer, laser marking powder and temperature sensitive material according to the component distribution ratio. By adding a temperature sensitive material and using the heat generated in the process of laser marking, the invention makes the temperature sensitive material undergo thermal decomposition, oxidation and other reactions at a certain temperature. These reactions destroy the original material structure or generate a new material, and produce a new color at the same time. This color change is unidirectional and irreversible, and the original color cannot be restored after cooling, Therefore, a stable permanent mark can be formed on the product. We are studying the laser color marking technology. We believe that the laser color marking patterns will be more complex and diverse in the future, and the exquisite decorative effect will give the laser marking a broader application space, which has become a major trend in the application of laser processing.