Analysis of the principle of laser direct engraving

Laser engraving directly on copper has long been considered technically infeasible, but lasers can directly engrave zinc. laser logo engraving，Through the improvement of the plate making process, the laser direct engraving is realized. A thin layer of nickel is plated on the copper roll, then copper is plated on its surface, followed by a layer of zinc. This layer of zinc absorbs laser energy and evaporates along with the copper below, forming ink-carrying cells.


After engraving, like other engraving cylinders, a hard layer of chrome is finally applied to the cylinder. 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 mainly consists of three parts: high-energy laser, laser transmission system, optical system, and the energy per unit area can be adjusted by adjusting the focal length.


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