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An extruder barrel has a diameter of 5 in and a length of 12 ft. It screw has a channel depth of 0.3 in, and rotates at 50 rev/ min. The plastic melt has a velocity of 〖100 ×10〗^(-4) lb-sec/〖in〗^2 . The die characteristic is Q_x = 0.0015p where p is the head pressure in psi. Determine the flight angle that maximizes the flow rate Q_x . Does any one know how to graph the pressure with the flow rate?