From the earliest high-speed development to the present stable development, laser engraving machine has a wide range of applications in China. At this time, in order to seek business development, a new technique that making color signs was born, creating a new era of laser marking.
    Color laser marking machines diverse from ink deposition technology or those through the application of color powder or film technology. One typical physical effect that more advanced laser is able to make plastic color change combines that polymer in the oxygen environment thermal decomposition reaction, all kinds of color on the surface of metal raw materials are produced.
    According to the different principle of color laser engraving on the surface of stainless steel, there are three methods: one is to produce colored oxides; he second is generating a very thin layer of colorless transparent oxide film on the surface of stainless steel by chemical or electrochemical or laser, which generates interference effect and produces color signs; the third one is a mixed state with colored oxide and oxide film.
    The Corresponding Relationship between Color Change and Laser Energy in Color laser Marking:Under the action of laser, the laser thermal effect is made on the surface of stainless steel. It is concluded that the laser flux density is proportional to the film thickness according to the effect. As the laser energy increasing, the color of the stainless steel surface changes in the following color order: Orange - Red - Purple - Blue - Green Blue - Blue Green - Green - Yellow Green - Yellow - Orange - Red.
    The color laser marking technology can engrave a variety of text patterns freely, and it’s easy to operate with a high-speed of marking and pollution-free. For the stainless steel industry, it’s a superior way that greatly enhance the value of stainless steel products and the international competitiveness of domestic stainless steel products by utilizing the color laser engraving machine.