High Speed Dispersers

What is a High Speed Disperser?

High-Speed Dispersers play an important role in processes where rotor-stator high shear mixers may not provide the most effective solution.

A common example of this is the incorporation of “difficult to wet” powders in liquid bases, that are prone to agglomeration.

The HSD mixer features a serrated tooth impeller. The high peripheral speed of the impeller causes centrifugal displacement of the base fluid, resulting in a powerful vortex. Powder is drawn down into the vortex and subjected to intense shear at the tip of the impeller blade, resulting in rapid dispersion.

HSD Impellers copy

Hygienic Hub

VHSD 20 SS Rear Drive raised cr38

Single Shaft High Speed Disperser

Why a Greaves High-Speed Disperser?

  • Rapid dispersion of solids, powders, prills and pigments
  • Consistent, repeatable particle size and distribution
  • Easy clean, hygienic construction
  • Extensive optional blade profiles
  • Low wear, low maintenance
  • Scalable from laboratory to bulk production, delivering consistent results regardless of batch size
  • CE compliant safety system
  • ATEX variants to Zone 0 & Zone 20 IIC T4
  • De-aeration options
  • Abrasive and corrosive resistant options
  • High pressure & vacuum shaft sealing options

High-Speed Dispersers FAQ’s

The high peripheral speed of its sawtooth impeller blade creates a down thrusting vortex towards its sharp teeth causing powders and agglomerates to be instantly dispersed in to their particulate size. As the fluid viscosity increases, it is found that up to 75% of the input energy is delivered to within 80mm of the blade tips. HSD mixers are very effective when mixing challenging powders into liquids, particularly in high ratios
Depth of knowledge, quality of engineering and minimal process times delivering efficiency both in terms of energy usage and output capabilities.
If you are struggling to wet powders out and/or process times appear to be longer than 15 or 20 minutes per batch, you should contact Greaves
A high shear mixer has a rotor stator type mixing head and emulsifies material with minimum liquid surface displacement. By contrast, High Speed Dispersers mixers have an impeller which creates a vortex. This generates down thrust which is effective in rapid wetting out of powders and agglomerates. Generally, HSD mixers are used for higher loading of powders, pigments dense buoyant solids including food processing!

In a word – Hugely!
Viscosity is a measure of a fluid’s resistance to flow. Measured in centipoises or Brix, it plays a key factor in determining which mixer types are appropriate, their diameters, speeds and the power required to drive them. Get in touch with our team who will be pleased to help.

Since 1955, so almost 70 years!