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The polymer flow in the counter-rotating twin screw extruder: (a) leakage flows, Qc—calendering flow, Qf—flight flow, Qt—pressure (tetrahedral) flow, Qs—side flow, (b) C-shaped chamber, 1—side surface of the screw flight, 2—barrel surface, 3—front surface of the screw flight, 4—surface of the screw root (adopted with permission from: Wilczyński, K. Rheology in Polymer Processing. Modeling and Simulation; Carl Hanser Verlag: Munich 2021 [34]).
