Optimally formulated dissolver batch showing the Doughnut Effect. Photo Courtesy of VMA-Getzmann
There are many laboratory disperser models available today to select from.
Dispersing What?
The first question to answer is what are you dispersing? If the product is difficult to disperse like organic pigments or carbon black, the disperser will need to use grinding media.
Volume and Viscosity?
The volume and viscosity of the mill base is the second criteria to consider. For higher volume and/or viscosity, a larger disperser motor is needed. The motor’s horsepower and torque should be considered. The motor’s torque (rotational force) at the selected shaft speed is an important criterion. If the motor is geared to maximize the torque at lower speeds (< 5,000 rpms), a lower horsepower motor can be selected.
This laminar flow pattern is obtained when the diameter for the vessel and the impeller as well as the distance between plane of disc and base of vessel are matched to one another. Photo Courtesy of VMA Getzmann.
Rotational Speed?
The remaining question is the rotational speed range. Do you need to achieve a certain tip speed with the disperser blade?
Solvent?
Finally one last consideration is when working with solvent-based coating an explosion-proof model may be required.
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BYK-Gardner, the sole representative of VMA-Getzmann in North America, supplies rotor-stators, high shear mixers, laboratory dispersers and pigment disperser technology for laboratories and pilot plants. For more information, visit:
BYK-Gardner Laboratories Blog 