The LR4 is a machine equipped with a CO2 Laser, which emits a beam of light at a pre-set infrared wavelength. An optic system concentrates the beam on a small surface of the material. The heat generated by the laser sublimates the material, thus creating small holes invisible to the naked eye. The diameter of the holes is regulated by an innovative 4.0 software that sets the strength of the beam on the material, which runs at a constant speed. The laser unit is thus able to perforate materials with different strengths and thicknesses. It also works on materials made of different layers.
Changing the size of the holes alters the exchange of atmospheric gas between the packed product and the outside environment. Finding the right balance ensures an increased shelf life of the fresh product. The software controls the pulses of the laser. At high frequencies, the laser runs continuously while at lower frequencies it creates holes at a set distance. The control system is supported by an encoder and a trigger system. This means the software can vary the size of the holes and the distance between them, thus adapting to different materials and requirements. By using the laser with calibrated power, it is possible to weaken the material in depth, reducing its thickness without perforating it, on web direction. This process is called laser scoring and creates easy opening tears that help the end-users open a product. Laserpin is investing in R&D to find increasingly better solutions for the latest developments in the industry.