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An extruder screw drive is a load of

  • A.negligible torque once the barrel is up to temperature
  • B.nearly constant torque with a wide speed range
  • C.constant power requiring field weakening throughout
  • D.torque proportional to the square of the screw speed

Answer: B

The pressure the screw develops is set by the die and the melt rather than by the speed, so the torque is flat and the power rises with output. Constant flux over the whole range, with generous overload capability for a cold start, is what the drive needs.

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