BOA Compactors

Ottevanger’s patented pre-compacting technology, a unique alternative for double pelleting or expanding. The Boa Compactors have a double-walled mixing chamber in which steam and liquids are introduced and the mixture is compacted using an hydraulically operated compacting chamber.

Generously sized paddles, adjustable in both height and pitch, guarantee a homogeneous mixture and a hygienic process. The mixture is introduced into the compacting chamber where a rotating three-roller head presses this through two conical friction rings.

Three hydraulic cylinders accurately assess the adjustable distance  (0.125 – 2.0″ ) between the friction rings which, along with the motor power of the main motor, determine the compaction level.

The unique combination of mixing chamber and compacting chamber ensures an optimum absorption of steam and liquids, a more homogeneous distribution of the raw materials, a higher pelleting capacity and excellent pellet quality.

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Features BOA Compactors

  • Double walled mixer housing, inner wall in AISI 316, outer wall in mild steel.
  • Door at the front and main shaft from AISI 304.
  • Solid main shaft.
  • Large interchangeable paddles, adjustable in both height and pitch.
  • Main shaft equipped with speed sensor.
  • Compacting chamber with rotating three-roller head, one stationary and one adjustable friction ring.
  • Three hydraulic cylinders with accurate read-out system.
  • Hydraulic unit.
  • Main shaft powered by electric motor.
  • Transmission via V-belts.
  • Shearpin protection against overload.
  • Door and large inspection hatches with safety switch.
  • Temperature sensor PT 100 in mixing chamber and on front bearing.
  • One steam inlet 3” and two liquid inlets 1½”.



  • Improved pellet quality
  • Increased capacity
  • Extreme flexibility in choice of raw materials
  • Optimum absorption of steam and liquids
  • Up to 10% increase of liquid dosing
  • Temperature up to 230° Fahrenheit
  • Homogeneous mixing and distribution of raw materials
  • Hygienic process, easy to clean
  • Low maintenance costs due to minimal wear
  • Robust construction of the housing
  • Simple design
  • Simple operation and integration of existing automation systems
  • Less Hp/mt with respect to double pelleting or expanding