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The challenge

Within an extrusion process, this dosing unit dispenses a product that is subject to degradation (aging) due to air exposure. The dosing unit must therefore incorporate the necessary facilities to inhibit or prevent this degradation. The dosing unit is used to dispense products with a range of viscosities in a R & D department.

Our solution

The suurDOS® unit is equipped with two storage vessels that are fully heated.

Each vessel incorporates a nitrogen blanket above the contents to inhibit premature aging of the product.

Safety cover with viewing hole

The vessels can easily be filled with unmelted product through a special safety cover. This cover has an inspection port with sight glass, which can only be opened when the nitrogen line is disconnected.

The vessel is electrically heated to melt the solid product. An agitator starts automatically when the product reaches a certain temperature, ensuring a homogeneous temperature distribution throughout the contents of the vessel.

Safety cover with inspection port
Mahr gear pump ensures pulsation-free dosing

Wide range of viscosities

The dosing unit is equipped with an over-dimensioned Coriolis flow meter to enable dosing of products over a wide range of viscosities. However, this does mean that the dosage can deviate by up to 1% from the preset value, especially at low flow rates. This is a concession that the customer has willingly accepted.

The result

The dosing unit enables the customer’s R & D department to continue their research into the influence of additives on the extrusion process, with greater precision than was possible previously. The comprehensive data logging function of the control system simplifies the task of collection and analysis of results.


  • Nitrogen blanket
  • Selectable storage vessels
  • Electrical heating
  • Agitator for homogenous heating
Vessels and pipework of the suurDOS® unit are fully insulated