In their natural state, thermoplastic polymers
can be subdivided into three categories in function
of the reaction to the laser:
Thermoplastic polymers with good
absorption and carbonization which produce extensive
blackening in the area exposed to the laser, which
happens with PES, PSU, PC, PPS.
Thermoplastic polymers with inconsistent
absorption and carbonization which is shown by
discontinuous marking (bead effect) as happens
with PS, SAN, ABS, PET and PBT. If appropriate
pigments or special additives are added, these
materials can be marked uniformly and with good
For both of the previous groups,
the optimization of the additive/pigment package
in the case of dark backgrounds can permit a light-coloured
Thermoplastic polymers with low absorption in
this group are PA, POM, PP, PE. In a natural non-pigmented
colour, these resins are not laserable. With the
use of a system optimized with pigments, it is
possible to obtain a contrast of a light colour
on dark or black substrates. Some of these polymers,
pigmented in light colours, generate a light-coloured
trace, but with the use of special additives,
a good contrast can be obtained.
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