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Sample dispersion for powder coatings

 

Malvern supplies a range of venturis for different applications. The two main types are :
  • Right-angle venturi
    The standard venturi, which provides a good amount of motive power, suitable for most applications.

  • Coaxial venturi
    A less efficient venturi (only a fraction of the efficiency of the right-angle venturi) which is very useful for easily-dispersed, fragile products

The figure below shows a pressure-size titration for a powder coating and the wet-dry overplot which indicates the correct pressure for dry measurements.

Powder coating pressure titration

Powder coating wet and dry

It can be seen that although particle size drifts down slightly with increasing pressure, dispersion equivalent to that observed in a wet sample is achieved at a low pressure, 0.2 bar. This is indicative of the low energy required to fully disperse a powder coating sample and explains why coaxial venturi can be used successfully for this application.