Laser direct labeling technology is a process in which the target surface is scanned by a laser beam with appropriate energy density that converges on the material surface, and physical or chemical changes occur to the material, so as to form a mark.For different materials, different process parameters, laser effect is not the same.Generally speaking, the interaction between laser beam and material has the following effects:
Vaporization effect
When the laser beam irradiates the material surface, except a part of the light is reflected, the laser energy absorbed by the material will be rapidly converted into heat energy, making the surface layer temperature rise sharply. When the material’s vaporization temperature is reached, the material surface will be marked by instantaneous vaporization and evaporation, and obvious vaporization will appear in such marking.
Etching effect
When a laser beam hits the material’s surface layer, the material absorbs light energy and conducts it to the inner layer.The heat conduction of the laser on the surface of the material makes it produce the effect of thermal dissolution. For example, when marking brittle materials such as glass, the corrosion effect is very obvious and there is no obvious evaporation.
Photochemical effect
For some organic compound materials, when they absorb laser energy, the chemical properties of the material will change.When the laser irradiates on the surface of colored polyvinyl chloride, the color of the material surface will be weakened due to the depolymerization effect, and the color difference will be formed with the part not irradiated by the laser, so as to obtain the marking effect.