In spite of the advantages achieved by using multilayer films,
the recycling of such kind of material is very difficult. The separation
and classification process of these films are hard task due
to the polymers similarity. Multilayer films are composed of polymers
incompatible for extrusion recycling [6–8]. Film containing
poly(ethylene terephthalate) (PET) is an interesting example. Forthe extrusion of PET, it is necessary to achieve higher temperatures
than those used for the extrusion of other polymers, such as
polyethylene (PE) and polypropylene (PP).