Extrusion/recycling of PET foil without dehumidification and crystallization

The use of packaging is exponentially grown in the ‘90 and this has generated enormous problems in the waste disposal. This, in addition to a new global ecological awareness, led to a research aimed to the valorisation of the 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 in the market a big quantity of very good quality scraps.

Transforming these flakes into a value-increased product is exactly the best example where a twin-screw corotating extruder can show all its quality and advantages.

The extraordinary feeding capacity of a corotating extruder allows the introduction of even 100 % recycled scraps without affecting the machine throughput.
The extrusion of a PET thermoformable foil with a corotating machine is a very cheap process with halved energy costs in comparison to the traditional systems.
Exploiting the extreme efficiency of the corotating extruder degassing system, it is possible to process the PET without the need of dehumidify and consequently crystallize the flakes before extrusion. All this maintaining a degradation degree, natural for PET, within well acceptable limits for the intended final applications. 

Dehumidification & crystallization are processes requiring high-energy consumption and avoiding these phases, in addition to the typical low consumption of the corotating extruder, you can get a decisively competitive production cost.


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