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 performanceof the extrusion process of recycled PET. The mathematical
prediction of the extruded mass flow is in good agreement
with the experimental data with a maximum error of 3 %.
Finally, the recommended operating conditions for textile
applications and the principal characteristics of raw recycled
material are: VI : 0.5-0.8, screw speed: 30-45 rpm, temperature: 0
o
270-300 C and humidity: 0.01-0.02 %. These operating conditions are important to control the variation levels than the recycled PET normally shows in extrusion process.