Laser light is different from ordinary coherent light source, due to its high directivity, high color and high-energy features since the early 1960s, since the emergence of the concern. Owners to apply laser printing in computer to plate systems, laser illuminators, laser printers, hologram printing, electronic publishing, printing and other aspects of laser tag. Among them, laser marking laser printing processing industry accounts for 45.3%, and the application field is still developing and expanding.
Laser tag printing, also known as laser marking, laser marking, in recent years in the printing field, such as packaging and printing, paper printing, security printing in the application identifies more and more, and some have been used for online production.
Fundamentals
Laser marking is a laser beam in a variety of substances marked with permanent marker surface. Marking effect is exposed by the deep surface of the evaporation of material substance, or by the chemical surface energy lead to physical changes and the "carved out" signs, or light burned through part of the material, showing the desired etching pattern, text.
Currently, the accepted theory are two:
"Thermal processing" has a high energy density laser beam (which is to focus on energy flow), irradiation in the processing surface, the surface absorb the laser energy to generate heat in the irradiated region to stimulate the process, so that the surface (or coating) temperature rise, resulting in abnormal, melting, ablation, evaporation and other phenomena.
"Cold" with high load energy (UV) photons, can interrupt the materials (especially organic material) or chemical bonds within the surrounding medium, to the non-thermal process of the material damage occurred. This cold laser tag in the processing of special significance, because it is not thermal ablation, but do not have a "thermal injury" side effects, cold peel break chemical bonds, and thus be processed in the surface layer and not near the area produce heat or hot deformation and so on. For example, the electronics industry in the use of excimer laser deposition of chemicals on the substrate film, the semiconductor substrate out of the narrow slot.
Principle of laser tag printing
Laser tag printing is achieved by laser marking machine graphics printing, and its basic principle is that generated by the laser generator of high-energy continuous laser beam, the laser effect on printing materials, the atoms in the ground state transition to a higher energy state ; at a higher energy state of the atom is unstable and will quickly return to the ground state, when the atoms return to ground state would take the form of photons or quantum energy to release additional by the light energy is converted to heat, the surface material instantaneous melting, even gasification to form the graphic mark.
1. Laser generator
The following will be krypton lamp laser marking system as an example to illustrate the principle of the laser generator. Krypton lamp is turned on, to 20kV high voltage breakdown in krypton krypton lamp, the power automatically converted output voltage 100V (5A), krypton lamp to maintain a continuous arc discharge. In the laser generator, the krypton lamp in the oval cavity of a condenser focus on the krypton arc lamp produced by the condenser chamber after reflection, then all the focus on another point - the crystal yttrium aluminum garnet (YAG) on the , YAG pump light absorption, the formation of a continuous wavelength of 1060nm laser, continuous laser resonator mirror perpendicular to the axis of the front and back and forth between the mirror after the oscillation, and the former mirror output.
2. Marking Principles
RF drive (RFDriver) control the switching state Q-switched, continuous laser Q-switch under the action of up to 110kW of peak power into light pulses, the pulses of light through the aperture to reach the threshold value, the output from the cavity to expand reach beam, beam by beam expander transmitted to the scanning mirror amplified by the servo motor driven X axis, Y axis of the rotating scanning lens for optical scanning, and finally focused by the plane's power market will be further amplified laser, focused on the work plane on the marking. The whole process controlled by a computer according to the procedure.
3. Characteristics of laser target
Laser marking machine because of their special works, and the traditional mark means (printing, marking, electrical corrosion, etc.), compared with many advantages;
1) non-contact processing
At any regular or irregular surface of the marking, and marking the workpiece does not produce internal stress;
2) The materials are suitable for a wide range of
In metals, plastics, ceramics, glass, paper, leather and other different types or different hardness of the material to print;
3) other equipment and production line integration and improve the automation of production lines;
4) marked a clear, durable, beautiful, and effective anti-counterfeiting;
5) long life, non-polluting;
6) Low operating costs
Marking speed and mark a shape, energy consumption, and thus low operating costs.
Although laser marking machine equipment, a large investment in equipment than traditional markers, but the running costs, the use of laser marking confidential lower.
① plastic transistor marking: marking machine working speed of 10 / s, if the equipment depreciation, a 5-year period, marking a cost of 0.00048 yuan / month. If you use a printing machine, the overall running cost of about 0.002 yuan / month, or even higher.
② bearing surface marking: if the bearing trisection typing, a total of 18 on the 4th word, using the galvanometer marking machine, krypton lamp to lamp life of 700 hours per each bearing the overall cost of marking of 0.00915 yuan. Electrical corrosion lettering costs about 0.015 yuan / month. Annual production of 4 million sets of bearings in the calculation, only marking a 1-year cost at least about 6.5 million.
7) The processing efficiency
Computer-controlled laser beam moving at high speed (up to 5 to 7 m / s), marking process can be completed in seconds. A standard computer keyboard printing can be completed within 12 seconds. Laser Marking System comes with a computer control system, with flexible and high-speed line.
8) development speed
As laser technology and computer technologies, the user can be as long as the computer programming, laser printouts, and print design change at any time, essentially replacing the traditional mold making process so as to shorten the product upgrade cycles and flexible production of a convenient tool.
9) high-precision
Very fine laser beam can act on the surface, the thin width of up to 0.05mm. For the precision machining and increased security features to create a broad application space.
Laser marking can meet in small plastic parts, printed on large amounts of data needs. For example, requirements can be produced more accurate, higher-resolution two-dimensional bar code, and stamping or marking spray compared to a stronger market competitiveness.
10) Low maintenance costs
Non-contact laser marking marking, unlike the life of the template marking process has limitations in the batch processing of very low maintenance costs.
11) with environmental protection
Non-contact laser marking marking, save energy, relative to the etching method, to avoid chemical pollution; relative to mechanical marking, can also reduce noise pollution.
4. The application of laser tag
For steel, non-ferrous metals, alloys and inorganic marking, and ceramic, diamond and silicon micro-machining of materials. The laser marking technology, including ABS keyboard, HDPE, PP, PET and PVC rigid containers and lids, nylon and PBT components, HDPE switch button, PVC pipe fittings and other marks printed.
