The previous article mainly talked about the shortcomings of the original processing method of the layer cutting process of the laser cutter laser. Here we will continue the previous article to talk about some basic principles of the laser scribing machine in the layer cutting process of flexible packaging.
Plastic film layers, metal film layers and paper show different absorption and radiation properties in the wavelength range (9.4~11μm) generated by the CO2 laser. Most plastic materials in the packaging industry, such as PET, PS, PC, PVC and OPA, can absorb laser beams very effectively at the typical 10.6μm wavelength. After absorbing the laser beam, the plastic film is locally heated and completely melted. However, a few plastic films such as OPP, PE and LLPE completely pass the 10.6μm laser wavelength. The aluminum foil layer does not absorb all wavelengths emitted by the low-power CO2 laser and completely reflects it.
Let the laser die cutting machine cut the packaging material according to the desired layer cutting structure. As long as the correct laser wavelength is used and the layer cutting is performed from the correct film surface. The following example illustrates the basic principle of laser layer cutting of composite films.
①PET-AL-PE: This is a typical composite material for food packaging, such as coffee packaging bags. The selective absorption of the material to CO2 laser (10.6μm) can use the mechanically supported PET layer to completely vaporize in a very small local area without affecting other layers. The reflection effect of the aluminum foil layer helps to use the laser more effectively.
②OPP-PE: This is a composite packaging material commonly used for washing powder packaging. Since PP has a stronger absorption capacity for laser beams than PE, the PP layer can be selectively cut during layer cutting without affecting other layers; in this case, the laser beam can be injected from any side of the film, that is, it is also allowed to penetrate the PE layer first and then melt through the PP layer.
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