Pre-Installation Installation Training
A70622-D1
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Laser effects and substrate reaction
Laser beam property
Laser marking is performed by two manners :
1- Removing material from the substrate
2- Changing the surface of the substrate.
It is essential to know how the substrate absorbs the LASER beam. According to the
wavelenghts and substrate properties, the absorption characteristics will be differents. These
parameters determine the best Laser types to use and the configuration to implement.
If the Laser beam is transmitted or reflected then coding could become more difficult.
The wavelengths of the Markem-Imaje CO2 laser beam are 9.3 µm, 10.2 µm & 10.6µm
into the infrared spectrum.
When the focused laser beam hits the surface of an infra-red absorbing material, such as ink
on card, the layer of ink is normally ablated or removed from the surface to reveal the
contrasting substrate material.
Many other materials also absorb and will mark at the infrared CO
2
laser wavelength. These
include glass (forms contrasting micro cracks at the surface), some plastics (contrast by
chemical change or melting) and coated metals.
Non absorbing materials, which do not mark with a CO
2
laser, include most metals which
reflect the laser beam and some plastics such as polyethylene which largely transmit the
laser radiation.
9.3 µm
10.2 µm
10.6 µm
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