Laser marking machine is a machine that uses laser beam to mark permanent marks on the surface of various different substances. The working mechanism of the marking machine is to expose the deep substances through evaporation of the surface substances, so as to carve exquisite patterns, trademarks and characters.
Common laser marking machines include optical fiber marking machine, ultraviolet laser marking machine and carbon dioxide laser marking machine. This article will mainly introduce the difference between optical fiber marking machine and ultraviolet laser marking machine in detail.
Production and processing mode
The fiber marking machine selects fiber grating as the resonant cavity of the fiber laser. The branch cladding fiber made by a unique process is introduced into the multimode pump light from the fiber fork, making the pump cross a small single mode fiber core doped with rare earth elements in the branch fiber. When the pump light traverses the single-mode fiber core every time, the atoms of rare earth elements will be pumped to the upper level, and then the spontaneous emission light will be generated through the transition. At the same time, the frequency selection of the fiber grating set in the fiber will make the spontaneous emission light of specific wavelength oscillate and expand, resulting in laser output.
The ultraviolet laser marking machine focuses the high-energy laser beam on the surface of the substance, interacts with the substance on the surface of the marker, and displays the required logo patterns and characters. The ultraviolet laser marking machine generally has two ways: hot processing and cold processing. The thermal processing laser marking mode is that the laser outputs a high-energy laser beam. When the laser beam contacts the marking material, it acts with the surface of the material to convert the light energy into heat energy, thus increasing the surface temperature of the marking material, quickly causing melting, ablation, evaporation and other phenomena, thus generating graphic signs.
application area
Optical fiber marking machine is applicable to most metal materials and some non-metallic materials. It can produce and process various nonmetals, especially high hardness, high brittleness and high melting point materials. At the same time, because it has the advantages of high production efficiency, stable and reliable production and processing quality, and good economic and social benefits, it has extremely extensive applications in commercial services, communication networks, military, medical and other aspects.
Ultraviolet laser marking machine is more suitable for laser flight marking of most materials, especially for plastic materials. Unlike optical fiber and carbon dioxide laser marking machines, the ultraviolet laser marking machine does not use the method of heating the material surface. It belongs to cold light engraving, so it is particularly suitable for marking food and medical packaging materials.