The principle and cause of laser engraving

Laser directly engraving copper plates has always been considered technically infeasible, but lasers can directly engrave zinc. Swiss MDC company has achieved laser direct engraving through the improvement of plate making process. A thin layer of nickel is first electroplated on the copper roller, then copper is plated on the surface, and then a layer of zinc is plated. This layer of zinc can absorb laser energy and evaporate, and then the copper underneath it evaporates, forming an ink-carrying network. After engraving, like other engraving rollers, a layer of hard chromium is finally plated on the roller. A YAG laser with a power of about 500W has also been developed, which can engrave 70,000 cells per second.

The direct laser engraving system is mainly composed of three parts: high-energy laser, laser transmission system, optical system, by adjusting the focal length, to adjust the energy per unit area.

Reasonedit

With the rapid development of optoelectronic technology, the application range of laser engraving technology has become wider and wider, and the engraving accuracy requirements have become higher and higher. The 4 most fundamental factors that affect laser engraving are: engraving speed, laser power, engraving accuracy, and materials. To achieve a certain engraving effect on a specific material, a laser with a certain energy is required. This energy should be regarded as the laser energy absorbed by the material = laser power / engraving speed. Simply speaking, to increase the laser energy absorbed by the material, you should increase the laser power or reduce the engraving speed. As for the final method to be used, it depends on the material and the final engraving effect. Generally speaking, users will avoid reducing speed, because that will reduce production efficiency. In fact, it is not only the speed of engraving that affects the efficiency of engraving, but also the accuracy of engraving.