Experimental Test
Figure 4 shows the relationship of the flow with respect to
the pressure applied to the extruder for different temperatures
of the extrusion process using pharma grade recycled PET.
o
At 290 C, the mass flow variation is not so sensitive to
pressure changes in the extruder. For the case of bottle grade
recycled PET, the mass flow showed a minimum variation at
o
280 C regarding the analyzed operating pressures. Finally, the experimental data were used for validating the mathe- matical model and Figure 5 shows the experimental mass flow of the pharma grade recycled PET and the respective calculated mass flows. The predicted results are very close to experimental data with a maximum error of 3 %. This result indicated that the model used to describe the performance of experimental set up is adequate.