on 3The diameter of an extruder barrel is 65 mm and its length is 1.75 m. The screw rotates at 55rev/min. The screw channel depth is 5.0 mm, and its

flight (helix) angle is 18°. The headpressure at the die end of the barrel is 5x106 Pa. The viscosity of the polymer melt is given as100 Pa-s. Calculate the volume flow rate of polymer in the barrel. The drag flow is given by the equation: Q_{d}=0.5 \pi^{2} \mathrm{D}^{2} N d_{c} \sin \varphi \cos \varphi The back pressure flow is given by the equation: Q_{b}=\frac{P \pi D d_{c}^{3} \sin ^{2} \varphi}{12 \eta L} The details of the extruder screw are given in figure 3.1