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The sudden expansion of the chips in the impregnator enables the chips to instantly soak up the impregnation chemicals provided to the impregnator.


The sudden expansion allows the chemicals to penetrate the chips homogeneously. The fully impregnated chips are elevated above the level of the liquid by twin-screws.

An impregnator is placed as a mixer between the plug-screw feeder and the screw conveyor to a reaction bin.

  • The plug from a screw feeder is broke up by a conical anti-backflow mechanism
  • Two counter-rotating screws elevate and mix the chips with a mixture of chemicals and water, added at the chip inlet of the vessel
  • The impregnated chips are then fall down into a screw conveyor to a retention bin