Laser marking is a marking method that uses a high-energy-density laser to irradiate the workpiece to vaporize or change the color of the surface material, thereby leaving a permanent mark. Under normal circumstances, the color of laser marking is mainly determined by the material of the workpiece after being irradiated by the laser, such as the surface material and the deep material or the chemical properties of the stainless steel cup, such as the color formed by oxidation after heating. Generally speaking, black and white and gray are more common. It is easy to identify and marked on the workpiece in a manner similar to engraving, which is difficult to erase, and has a good anti-counterfeiting effect.
It has been confirmed by experiments that on some metals, by adjusting the parameters of the laser marking machine, or according to the characteristics of the metal material, the laser can be used to achieve richer colors. colors:
No ink, just relying on the high temperature irradiation of fiber laser, why do many colors appear on the surface of wholesale blank stainless steel cups?
The principle is mainly the following two points:
- The stainless steel on the surface of the water cup is oxidized to form an oxide layer when the surface is melted at high temperature by the laser.
- Under the continuous irradiation of the laser, the chemical reaction between the stainless steel and the oxide layer will form different colors due to different degrees of interference.
For example, the main component of the black mark marked on the surface of the bulk stainless steel water bottles is triiron tetroxide or iron oxide, while the green is manganese monoxide. If you need to change the color of the text marked by laser on the stainless steel water cup, you can change the photothermal effect between the laser and the stainless steel by adjusting the energy density of the laser emitted by the laser. Different power and different oxide film thickness will change the color of the marked characters. .
Although the surface of the stainless steel water cup can be marked with film or ink printing, etc., the ink or label is easily worn out with long-term use, while laser marking uses a permanent marking method, which is almost It cannot be easily erased, has better appearance effect and anti-counterfeiting characteristics, and the product is more high-grade, which improves the added value of the product, especially some factories that produce stainless steel thermos cups, a color that can be permanently marked on the stainless steel surface. Laser marking machine is a good choice.