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(SI units) An extruder barrel has diameter = 80 mm and length = 2.0 m. Its screw has a channel depth = 6 mm, flight

(SI units) An extruder barrel has diameter = 80 mm and length = 2.0 m. Its screw has a channel depth = 6 mm, flight angle = 18, and it rotates at 1 rev/s. The plastic melt has a viscosity = 150 Pa-s. Determine the extruder characteristic by computing Qmax and pmax and then finding the linear equation defining the straight line between them.


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Solution: Formula for max "volume drag flow rate" Qmax = Qd = 0.5. M2 D2 N. de sin x cos xx Substituting the values Qd=0.5. (*) - (0.08) -(1)(0.006). sin 18 cos 18 Qmax =Qd=5.569-105 m/sec Formula for "Maximum Pressure head" 6. D N.L.M. cot xx Pmaz Pmax Pmax = Qmax d 6 0.08 1.2.150 cot 18 . (0.006) 38.67 MPa 5.569-103m/sec -5 Qmax 6-10 m/s Equation for Straight line Qmaz Pmaz Qz = Qmaz ( Qz6-10-538-67-106 6-10-5 Qz6-10 5 - 1.5516-10-12p Shape Factor Given - Da = 3.10m Given Ld=12.10 3m D KB = 128. M. Ld K, 1. 106 107 = -12

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