What is the Laser Marking?

The laser marking machine uses a laser beam to make permanent marks on the surface of various materials. The effect of marking is to expose the deep material through the evaporation of the surface material, thereby engraving exquisite patterns, trademarks and text.

 

Desktop laser marking machine

                              Desktop laser marking machine

 

The basic principle of laser marking is to use a high-energy laser beam to irradiate the surface of the object, and the light energy is instantly converted into heat energy, so that the surface of the object quickly evaporates, exposing the deep layer of material, or the light energy causes the chemical and physical changes of the surface material to engrave. Traces, or use light energy to burn off part of the material, so as to engrave any required text and graphics on the surface of the object, which can be used as a permanent anti-counterfeiting mark.

 

The Mechanism of Laser Marking 

Laser marking is under the action of a high-energy laser beam to cause the processed workpiece to undergo physical and chemical reactions such as melting, vaporization, heating and discoloration, thereby leaving a permanent mark on the surface of the workpiece. According to the different laser energy used, the mechanism of laser marking can be divided into the following types

Heating to Change Color Marking 

When most materials (especially some non-metallic materials, such as plastic, paper, rubber, etc.) are heated by laser, the material itself undergoes a chemical change, which will cause the surface color of the marked workpiece to change or make its surface gloss brighter. Therefore, this mechanism can be used for marking.

This change in the color of the material during laser heating only appears on the surface of the material, which is caused by changes in the metallurgical structure of metals or changes in the chemical composition of non-metals. It is generally difficult to predict the color change of these materials, especially plastic materials when the laser is applied.

Most of the laser marking machines in mask mode use this method for marking. This marking method requires low power density, the temperature of the marking part is below the melting point of the material, and the deformation of the material caused during marking is extremely small, which is suitable for laser marking on non-metallic materials.

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