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Leakage flows in the counter-rotating twin screw extrusion for different pressure gradients (∂p/∂z), positive (Δp < 0) and negative (Δp > 0): Qc—calendering leakage flow, Qf—flight leakage flow, Qs—side leakage flow, Qt—pressure leakage flow (adopted with permission from: Wilczyński, K. Rheology in Polymer Processing. Modeling and Simulation; Carl Hanser Verlag: Munich 2021 [34]).
