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Static Spiral Flow Classifier 3S

The static spiral flow classifier 3S is integrated in the cocoa pulverization plant. The ground cocoa powder contains particle sizes outside the specification of d99.75 < 75 µm. To ensure constant product quality and reliable limitation of the maximum particle size, coarse particles are separated in the spiral flow classifier 3S and fed back to the mill.

Operating Principle:

  • Operation within a wide range is possible by adjusting the buckets.
  • Additional secondary air serves for fine adjustment of the cut point.
  • Product feed with the process air facilitates connection in case of simultaneous operation with a mill.


  • Adjustment of the cut point by simple adjustment of the buckets and air volume or of the product feed quantity
  • No rotating parts
  • Easy and fast cleaning thanks to optimum accessibility of the classifier by opening the cover which is swivelled aside via a swivel arm
  • Steep fine grain curves
  • High selectivity
  • Gentle classification of the sensitive cocoa powder
  • Energetically favorable operation, because there are no moving or driven parts
  • Safe operation in case of sticky products thanks to smooth surfaces Ra < 0.8
  • State-of-the-art technology, explosion-proof design up to 10 bar overpressure and compliance with the ATEX directive 94/9/EU

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