There are two accepted principles:
"Thermal processing" has a relatively high energy density of laser beam (it is a concentrated energy flow), irradiated on the surface of the processed material, the surface of the material absorbs laser energy, the thermal excitation process is generated in the irradiated area, so that the material surface (or coating) temperature rises, resulting in metamorphism, melting, ablation, evaporation and other phenomena.
"Cold processing" has a very high energy load of (ultraviolet) photons that can break the chemical bonds of materials (especially organic materials) or surrounding media to the point of non-thermal process destruction.This kind of cold processing has special significance in laser marking processing, because it is not thermal ablation, but does not produce "thermal damage" side effects, breaking the chemical bond of the cold stripping, so it does not produce heating or thermal deformation on the surface of the inner layer and the nearby areas.In the electronics industry, for example, excimer lasers are used to deposit thin films of chemicals on a substrate, creating narrow grooves in a semiconductor substrate.
Comparison of different marking methods
Compared with inkjet marking method, the advantages of laser marking engraving are: wide application, a variety of materials (metal, glass, ceramics, plastics, leather, etc.) can be marked with permanent high quality.No force on the workpiece surface, no mechanical deformation, no corrosion on the material surface.
The product application
Can carve a variety of non - metallic materials.Used for garment accessories, pharmaceutical packaging, wine packaging, architectural ceramics, beverage packaging, fabric cutting, rubber products, shell nameplates, craft gifts, electronic components, leather and other industries.
1. Can carve metal and a variety of non-metallic materials.More suitable for application in some requirements of fine, high precision product processing.
2. It is applied to electronic components, integrated circuits (IC), electrical appliances, mobile phone communication, hardware products, tools and accessories, precision instruments, glasses and clocks, jewelry, automobile accessories, plastic keys, building materials, PVC pipes, medical devices and other industries.
3. The applicable materials include: ordinary metals and alloys (iron, copper, aluminum, magnesium, zinc, etc) all metal, rare metal and alloy (gold, silver, titanium), metal oxide (either all kinds of metal oxide), special surface treatment (phosphating, anodized aluminum, plating surface), ABS material (electrical appliances shell, daily necessities), ink (pervious to light buttons, printing products), epoxy resin (encapsulation of electronic components, insulating layer).
On the market the most common type of laser marking machine is mainly by CO2 laser marking machine, YAG laser marking machine, YAG laser marking machine later gradually replaced by semiconductor laser marking machine, laser marking machine market share up to a model, there are also some high-end end pump laser marking machine, fiber laser marking machine, uv laser marking machine, etc.
With the development of science and technology, optical fiber laser marking machine in the electronic industry is more and more accepted by more people, its characteristics are very obvious: integrated design, small size, low power consumption, long life, high efficiency, maintenance free, with high quality laser beam, fine light, no need for consumables.
1.YAG laser marking machine
Semiconductor pump laser marking machine is the use of a wavelength of 0.808um semiconductor laser diode (side or end face) pump Nd: YAG medium, so that the medium produces a large number of reversed particles in the Q switch under the action of the formation of 1.064um wavelength of the giant pulse laser output, electro-optical conversion efficiency is high.Semiconductor pump laser marking machine and lamp pump YAG just compared to the marking machine has better stability, energy saving, do not need to change the lamp, and other advantages, relatively high price.
2. Optical fiber laser marking machine
Mainly consists of laser, lens, marking card of three parts, using production laser marking machine, fiber laser beam quality good, the output center is 1064 nm, the whole life in 100000 hours, compared with other types of laser marking machine live longer, electro-optic conversion efficiency of 28% above, relative to other types of laser marking machine conversion efficiency of 2% 10% of the huge advantage, outstanding performance in energy conservation and environmental protection, etc.
3.CO2 laser marking machine
CO2 laser is a gas laser with a wavelength of 10.64um in the far-infrared optical frequency band. CO2 gas is used to charge into the discharge tube as the medium for laser generation. When a high voltage is applied to the electrode, a glow discharge is generated in the discharge tube to release the laser from the gas molecules, and the laser energy is amplified to form a laser beam for material processing.
5. Ultraviolet laser marking machine
Ultraviolet laser marking machine is equipped with deep ultraviolet laser, imported high-speed scanning mirror system, etc.Ultraviolet laser marking machine can be used for ultra-fine marking and special material marking due to its small focusing spot and little heat-affected area. Therefore, ultraviolet laser marking machine is the customer's preferred product with higher requirements for marking effect.Ultraviolet laser marking machine has the characteristics of high electro-optic conversion rate, long service life of nonlinear crystal, stable operation of the whole machine, high positioning accuracy, high operating efficiency, modular design for easy installation and maintenance.In addition, 2-d automatic worktable can be selected to realize multi-station continuous marking or large-format marking.
6. Green laser marking machine
Green laser marking machine is developed by using the most advanced 532nm laser pumping technology (side pumping or end pumping) in the world. Customers can freely choose the pumping type according to the characteristics of their own products. The electro-optical conversion rate of this kind of laser is high, which can reach more than 30% or 45%.He USES a wide range: tag a variety of metals (such as stainless steel, copper alloy, etc.) and various non-metallic materials, such as glass, stone, ceramics, electroplating buttons, gold-plated devices, etc.) of marking, and optical device (such as light word lens, etc.) or calibration of marking, also suitable for ceramic punching, high-temperature PCB molding directly.Compared with similar products, it has a relatively high cost performance and is more suitable for applications requiring more precision and precision.Compared with similar products have a relatively high cost performance.His price is even higher.
7. Yttrium aluminum garnet type
The active medium is a solid. The laser emits 1060nm light wave near the infrared region. There are two types, continuous type and light pen type. By changing the output energy, laser beams with different intensities can be obtained.Marking process has coking method (dark marking), foaming method (light marking) and ablation method (carving marking), marking quality is excellent.
8. Excimer type
The medium is composed of a mixture of helium, argon, krypton, neon, and halogens such as chlorine, fluorine, bromine, and iodine.