The use of packaging is exponentially grown in the ‘90 and this has generated enormous problems with waste disposal. This, in addition to a new global ecological awareness, led to research aimed at the valorization of plastics wastes.
The simplest products to identify and select are the PET bottles; a circuit for PET flakes recovering/selecting / washing has been created, introducing into the market a big quantity of very good quality scraps.
Transforming these flakes into a value-increased product is exactly the best example of where a twin-screw co-rotating extruder can show all its quality and advantages.
→ The extraordinary feeding capacity of a co-rotating extruder allows the introduction of even 100 % recycled scraps without affecting the machine throughput.
→ The extrusion of a PET thermoformable foil with a co-rotating machine is a very cheap process with halved energy costs in comparison to the traditional systems.
→ Exploiting the extreme efficiency of the co-rotating extruder degassing system, it is possible to process the PET without the need to dehumidify and consequently crystallize the flakes before extrusion. All this maintains a degradation degree, natural for PET, within well acceptable limits for the intended final applications.
Dehumidification & crystallization are processes requiring high-energy consumption and by avoiding these phases, in addition to the typical low consumption of the co-rotating extruder, you can get a decisively competitive production cost.