Thermo-mechanical methods are simpler than chemical methods and the economical value of the products is generally higher than that of the mechanical methods. Thermo-mechanical method is the most common method to recycle PET bottle wastes.
The thermo-mechanical method is mainly a re-extrusion process. This process consists of sev- eral steps. These steps can be grouped as follows: cutting, compacting/drying or drying and feeding to extruder.