Powders into liquid – A new solution to an old mixing problem

The Problem

The dispersion of fine powder in a liquid can be a challenging process throughout pharma, cosmetics/healthcare & food manufacturing. Example applications include:

  • Foods – Garlic to cold water, pectin, starch, xanthan gum, cornflour, carbon black
  • Pharma & Cosmetics – Carbopol, calcium carbonate, titanium dioxide, sorbitol

The issue often arises where manufacturers are using inappropriate or outdated mixing technology. The issues can include:

  • Excessive mixing time – often measured in hours
  • Slow manual addition of raw materials
  • Floating agglomerates and  “fish-eyes”
  • Risk of unreliable operator input with results highly dependent on operator skill
  • The common need to pre-heat liquid base is slow & energy-inefficient
  • Unstable suspensions can be prone to separation (meaning short shelf-life)
  • Powder adheres to support pillars and support bushes. (wear, cleaning & maintenance issues)
  • Difficult-to-clean systems present hygiene risks

The traditional approach

Historically, when faced with the “powder-liquid problem” manufacturers usually try two techniques:

  • Impeller / propeller (perhaps at high speed)
  • High shear mixer (rotor-stator type)

Neither of these approaches is guaranteed to resolve the powder/liquid problem and almost invariably results in lower productivity than optimum solution.


The Greaves’ solution – the High-Speed Disperser™ (HSD)

Greaves’ High-Speed Disperser™ technology has been developed specifically to tackle the problems associated with mixing lightweight, difficult-to-wet powders.

The HSD solution involves:

  • Creation of a deep vortex which immediately draws powder into the mixing zone allowing:
    • Rapid addition of powder
    • Greatly reduced surface agglomeration
  • High-speed, serrated disc impeller delivering:
    • Rapid powder incorporation and dispersion
    • Dispersion of agglomerates
    • Consistent flow and downthrust

The benefits of Greaves’ HSD mixers include

  • Significant increase in productivity – cycle time in minutes rather than hours
  • Reduced operator input – easier to use
  • Hygienic construction – easy clean-down
  • Cold mixing – no slow, expensive pre-heating
  • Improved product consistency and stability

This video demonstrates the Greaves’ solution in action…

For further information please see https://www.greaves.co.uk/greaves-gallery/mixers/high-speed-dispersers/

Our focus is on delivering real benefit to our customers. We are happy to arrange mixer trials to demonstrate the effectiveness of our approach.

If you are interested in finding out more, please get in touch

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