In this study, we have reported a screw design that
includes an appropriate handling of flows and pressure drop
inside the extruder and adequate design parameters for
recycling PET. This design includes a spinning system,
which is based on current technologies for the development
of special fibers. Results of the mathematical analysis were
used to identify the quantitative impact of the characteristics
of the raw material, pressure, temperature, feeding flow,
extrusion speed and design of the extruder on the performance of the extrusion process of recycled PET.