**3.1 Rheological values**

The rheological values were obtained from the test carried out by technical personnel of the company ALFAVINIL S.A., manufacturers of PVC compounds, using a RheoDrive 7 capillary rheometer, model: Rheomex 19/25 OS, in line with an extruder, whose screw has a ratio of compression 2:1, L/D: 25 and a capillary matrix of slit H: 2.0 mm, W: 20 mm and with a profile of temperatures of the material of 150, 170, and 190°C in the extruder and 200°C in the head.
