Dispersion Blade Designs: A Brief Discussion
Dispersion blade design selection is usually based on batch viscosity, desired process results and experimentation. We offer 5 styles of dispersion blades in 304 stainless steel. Many are also available in 316 stainless steel or with a tungsten carbide coating for extended life. The blade style can have a direct relationship to the results of your dispersion. The following is a brief discussion of blade types relative to one another:
All dispersion blade designs provide high shear. The key differences in blade types are in regard to pumping capacities. A blade's pumping capacity refers to how well it moves material around the vessel or turns the batch over. Pumping capacity is related to the size and the shape of the teeth. Our Design A, B, C and D blades will vary the most in their pumping capacity rather than their shearing ability.
Our Design A & E blades have the lowest pumping capacity due to their smaller teeth size. Design B, C and D provide increasingly higher pumping capacity. The design D blade features two different styles of aggressively sloped teeth resulting in higher pumping capacity. Since higher pumping action is helpful for dispersion with viscous materials a Design C or D is recommended for these applications. Higher pumping capacity also consumes more horsepower, so caution should be used to avoid overloading the motor. Blades with higher pumping capacities can also introduce more air into the mixture than those designed for general dispersion. If low air entrapment is important, our Design A or E are recommended.