Q1]: In a particular extruder screw the channel depth is 2.4 mm, the screw diameter is 50 mm, the screw speed is 100 rev/min, the flight angle is 17° and the pressure varies linearly over the screw length of 1000 mm from zero at entry to 20 MN/m at the die entry. The plastic viscosity was 200 Ns/m.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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QI): In a particular extruder screw the channel depth is 2.4 mm, the screw diameter is 50
mm, the screw speed is 100 rev/min, the flight angle is 17° and the pressure varies linearly
over the screw length of 1000 mm from zero at entry to 20 MN/m at the die entry. The
plastic viscosity was 200 Ns/m.
Estimate:
A) The drag flow, pressure flow and total flow
B) The operating point for the extruder when it is combined with a die of length, 40
mm and diameter of 3 mm.
C) The effect on pressure and output if a plastic with viscosity 400 Ns/m was used.
Transcribed Image Text:QI): In a particular extruder screw the channel depth is 2.4 mm, the screw diameter is 50 mm, the screw speed is 100 rev/min, the flight angle is 17° and the pressure varies linearly over the screw length of 1000 mm from zero at entry to 20 MN/m at the die entry. The plastic viscosity was 200 Ns/m. Estimate: A) The drag flow, pressure flow and total flow B) The operating point for the extruder when it is combined with a die of length, 40 mm and diameter of 3 mm. C) The effect on pressure and output if a plastic with viscosity 400 Ns/m was used.
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