Dispersing is the actual generic term for work, which is executed using rotor/stator units. It is also referred to as "wet grinding". The main task of rotor/stator dispersers is crushing, mixing or foaming of different components to evenly distribute them. The resulting dispersions, emulsions, suspensions and foams are used in the pharmaceutical, chemical, food, life science and cosmetics industry.
The following material systems can be processed using these rotor/stator generators:
LIQUID-SOLID / LIQUID-LIQUID/ LIQUID-GASEOUS
The Rotor is the rotating part of the generator. As it rotates within the stator, a vortex is created, which sucks the product to be processed into the generator or working zone. In this process, the product is accelerated axially and pushed to the outside through the tooth apertures of the stator by centrifugal force.
Rotor and stator intermesh coaxially. Driven by a high-performance motor, the rotor generates vacuum, which continuously sucks in the phases to be dispersed. The phases to be dispersed are accelerated centrifugally in the working range of the rotor/stator before they reach the shear gap between rotor and stator. The product is subject to high deceleration-tangential and radial acceleration forces. The individual particles/droplets are torn apart and thus reduced in size. This is called shearing. In this process, circumferential speeds of up to 50 m/s can be reached. The particles/droplets are reduced further in size through additional cutting and crashing effects. These extreme turbulences that are caused during processing provide for excellent homogenization of the product!
Two liquids that cannot be mixed stably, a hydrophobic (e.g. oil) and a hydrophilic (e.g. water) phase, are mixed with each other permanently. In order to get a stable emulsion the total surface of drops is required to be as large as possible (this can only be achieved by very small drops) and an emulsifier and possibly a stabilizer are required as well. (e.g. skin cream).