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Refining of pulp before the paper machine serves to

  • A.shorten the fibres just as much as possible
  • B.remove the remaining lignin from it
  • C.bleach the washed pulp still further
  • D.fibrillate the fibres so they bond better

Answer: D

Beating raises the surface area available for hydrogen bonding, which is what gives the sheet its strength. Overdoing it shortens the fibres and makes a dense sheet that is slow to drain. Refining energy is a significant operating cost.

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