The micro-compounder consists of a conical counter-
rotating twin screw extruder that can be considered as a
gear pump [24]. Screws push the polymer into the recirculation channel. Therefore, the mass of the polymer that is
transported into the circulation bypass is equal to the output
mass flow of the extruder. By measuring the total weight
(mw) over a given time interval (t), the mass flow rate (Qm)
for each rotation speed (n) is measured. The experimental
procedure is schematically shown in Fig. 5.Beforeeach
measurement, several grams of polymer formulation were