*2.3.4 Extrusion tests*

Extrusion tests are carried out using a Collins single-screw extruder (**Figure 12**) with a 2:1 compression ratio screw, the auxiliary equipment of the same brand, such as the vacuum and cooling calibration trays (**Figure 13**), and the system drag or pull (**Figure 14**).

**Figure 13.** *Calibration and cooling pan.*

**Figure 14.** *Drive unit.*
