What should you know before buying a Laser marking machine?
When you have the idea of buying Laser marking machine, you should know what is Laser marking machine? How does Laser marking machine work? Advantages of Laser marking machine, application of Laser marking machine, Laser marking machine with different technology.
What is Laser marking machine? Laser marking is a method of using laser to mark various objects. The principle of laser marking is that the laser beam will change the optical appearance of the impact surface in some way. This can happen through a variety of mechanisms:
- Ablative materials (laser engraving); Sometimes some colored surface layers are removed.
- Melt the metal to change the surface structure.
- Light burning (carbonization), such as paper, paperboard, wood or polymer.
- Conversion of pigments (industrial laser additives) in plastic materials (e.g. bleaching).
- If, for example, some additives evaporate, the polymer expands.
- Produce surface structures, such as small bubbles.
By scanning the laser beam (for example, using two movable mirrors), letters, symbols, barcodes and other graphics can be written quickly using vector or raster scanning. Another method is to use a mask (projection mark, mask mark) to image the workpiece. This method is simple and fast (even for moving workpiece), but not as flexible as scanning“ "Laser marking" means the use of a laser beam to mark or label work pieces and materials. In this respect, different processes are distinguished, such as carving, removal, dyeing, annealing and foaming. According to the material and quality requirements, each of these processes has its own advantages and disadvantages.
How does Laser marking machine work?
Laser technology foundation all lasers consist of three components:
- External pump source.
- Active laser medium.
The pump source directs the external energy to the laser. The active laser medium is located inside the laser. According to the design, the laser medium can be composed of gas mixture (CO2 laser), crystal (YAG laser) or glass fiber (fiber laser). When energy is pumped into the laser medium, it emits energy in the form of radiation. The active laser medium is located between two mirrors, which is called "resonator". One of these mirrors is a one-way mirror. The radiation of the active laser medium is amplified in the resonator. At the same time, only a certain amount of radiation can leave the resonator through the unidirectional mirror. This kind of radiation is laser radiation.
Benefits of Laser marking machine
Consistent high-precision marking benefits from the high-precision laser marking, even very beautiful graphics, 1 point font and small geometry can be clearly identified. At the same time, laser marking ensures consistently high quality results.
Laser marking is one of the fastest marking processes in the market. This leads to high productivity and cost advantage during manufacturing. Depending on the structure and size of the material, different laser sources (such as fiber laser) or laser machines (such as galvanometer laser) can be used to further improve the speed.
Laser etching is permanent, with wear resistance, heat resistance and acid resistance. According to the laser parameter setting, some materials can also be marked without damaging the surface.
Application of Laser marking machine
Laser marking machine has many applications
- Add part number, date of use, etc. to food packaging, bottles, etc.
- Add traceability information for quality control.
- Mark printed circuit board (PCB), electronic components and cables.
- Print logo, barcode and other information on the product.
Compared with other marking technologies such as inkjet printing and mechanical marking, laser marking has many advantages, such as high processing speed, low operating cost (no consumables), consistent high quality and result durability, pollution avoidance, ability to write very small functions, and high flexibility in automation.
Plastic materials, wood, paperboard, paper, leather and acrylic resins are usually marked with relatively low power CO2 lasers. For metal surfaces, these lasers are not suitable because they operate at long wavelengths (about 10 nm) μ m) The absorption is very small. It is more suitable, for example, to obtain a 1.5 V output in a lamp or diode pumped Nd: YAG laser (usually a Q-switch) or a fiber laser- μ The wavelength of the laser is in the range of 0. The typical laser power used for marking is about 10 to 100 W. Shorter wavelengths (e.g., 532 nm) (e.g., obtained by frequency doubling of a YAG laser) may be advantageous, but such sources are not always economically competitive. For tags in 1 μ For metals such as gold whose absorptivity is too low in the M spectrum, a short wavelength laser must be used.
Stainless steel, aluminum, gold, silver, titanium, bronze, platinum or copper
Laser has been used for many years, especially in laser engraving and metal marking. Using laser can not only mark soft metal such as aluminum accurately, clearly and quickly, but also mark steel or very hard alloy. For some metals, such as steel alloys, corrosion resistance marking can even be applied without damaging the surface structure using annealing marking. Products made of metal use laser marking in many industries.
Polycarbonate (PC), polyamide (PA), polyethylene (PE), polypropylene (PP), acrylonitrile butadiene styrene copolymer (ABS), polyimide (PI), polystyrene (PS), polymethylmethacrylate (PMMA), polyester (PES)
Lasers can be marked or engraved on plastics in a variety of ways. With the help of fiber laser, you can label many different commercial plastics on permanent, fast and high quality surfaces, such as polycarbonate, ABS, polyamide, etc. Due to the short setup time and high flexibility of the Laser marking machine, you can even mark small batches economically.
Organic materials need special solutions in order to provide them with a clear and permanent mark. Our expert development of laser marking system can perfectly meet this requirement. The intensity of the system can be controlled to keep the heat generation within the required range.
Glass and ceramics glass and ceramics and other materials for our customers and their business industry put forward strict requirements. For this reason, we have developed a high contrast, crack free marking technology.
Different technology of Laser marking machine
Annealing marking annealing marking is a special type of laser etching for metals. The thermal effect of laser beam leads to the oxidation process under the material surface, which leads to the color change of metal surface.
In the process of laser engraving, the surface of workpiece will be melted and evaporated by laser. As a result, the material is removed by the laser beam. The impression on the surface is sculpture.
During the removal process, the laser beam removes the topcoat applied to the substrate. Due to the different colors of the topcoat and the substrate, there is a contrast. Common materials for laser marking by removing materials include anodized aluminum, coated metals, foils and thin films or laminates.
During the foaming process, the laser beam will melt the material. In this process, bubbles are generated in the material, which diffuse light. As a result, the mark will be brighter than the unetched area. This type of laser marking is mainly used for dark plastic.
Carbonization creates a strong contrast on a bright surface. During the carbonization process, the laser heats the surface of the material (minimum 100 ℃) ° C) And release oxygen, hydrogen or a mixture of two gases. What's left is the dark areas with higher carbon concentrations. Carbonization can be used in polymers or biopolymers, such as wood or leather. Because carbonization always leads to dark marks, the contrast on dark materials will be very small.
Color marking is a process of marking color on stainless steel, titanium and other metal surfaces using MOPA fiber laser source. MOPA is a configuration composed of main laser (or seed laser) and optical amplifier to improve the output power.
The 3D laser marking system controls the high-speed reciprocating motion of the optical beam expander lens in the direction of the optical axis through software, dynamically adjusts the focal length of the laser beam, and makes the focal spots at different positions on the workpiece surface uniform, so as to achieve the surface accuracy of 3D surface and laser processing.