Laser marking machine achieves color marking on stainless steel surface

Laser marking technology has enabled domestic companies to enter the laser processing industry. Especially after fiber lasers became widely used in laser equipment, the laser marking sector reached a market peak. However, for many years, laser marking applications have been limited to black and white patterns. Currently, only a portion of fiber lasers can achieve color marking on stainless steel surfaces. This innovation is opening up new possibilities in visual design and product aesthetics. Koi side laser – stainless steel color marking To achieve such vibrant visual effects, manufacturers now use not only inkjet or lacquer methods but also advanced lasers that allow independent adjustment of pulse width and frequency—such as MOPA pulsed fiber lasers. These systems offer greater flexibility compared to traditional Q-switched lasers. When a laser marks stainless steel, the beam can be fine-tuned to alter the surface layer’s color, creating decorative effects with various hues. The key advantage of MOPA lasers is their ability to adjust pulse width and frequency independently without affecting other parameters. This feature opens up countless possibilities for color variation during the marking process. In practice, factors like pulse width, frequency, power, speed, fill mode, pitch, and delay all influence the final color outcome. However, this technology is still in its early stages and faces several challenges. It remains expensive, with a single color laser marking machine costing as much as several standard ones. This high cost limits its adoption among many manufacturers. New developments in laser color marking are emerging. A German laminate group recently introduced a material consisting of an outer and inner layer. The outer layer contains a transparent polymer carrier embedded with an infrared-absorbing dye that reacts under laser exposure. This material works on almost any common marking surface, offering advantages over traditional laser paper. In Japan, a new composition for laser color marking has also been developed. It includes a polymer base, laser marking powder, and a temperature-sensitive substance. The preparation method involves melt blending these components. During the laser process, heat triggers thermal decomposition or oxidation of the temperature-sensitive material, altering the original structure or producing new compounds. This results in a permanent color change that cannot be reversed, ensuring a durable and stable mark. Shenzhen Jinyifang Laser Company is actively developing laser color marking techniques. They believe that future patterns will become more complex and diverse, offering intricate decorative effects. As a result, laser marking is expected to expand into new application areas, becoming a major trend in the laser processing industry.

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