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Tension control on a winding machine is usually achieved by

  • A.applying a mechanical brake to the unwind reel
  • B.running both drives at exactly the same speed
  • C.fitting a fluid coupling between the two reels
  • D.trimming the speed of one drive against the other

Answer: D

A small speed difference between the sections stretches the web slightly, and a load cell or a dancer roll closes the loop on the resulting tension. Exactly equal speeds would leave the tension undefined and the web either slack or torn.

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