Dispersant limitations depend on product rheology. This means that there is a great deal to do with the flow properties of the product being dispersed. If it is too thick, there will be no free entry and exit, and the blades will scrape off the tank walls, so there will be dead spaces in the tank for undispersed material.
If it is too thin, there may not be enough body to create a tear between the product layers as they continuously contact the rotating disk. Sticky or "sticky" products may also hinder the blade's ability to create proper flow within the tank. Proper flow should be like a donut, with the blade acting as the hole. The product should flow in a circular pattern around the tank walls while rolling inwards to contact the blades. This type of flow is sometimes called a donut roll. If undispersed particles stick to tank walls or flow is insufficient to roll the entire
Disperses into leaves, complete dispersion is not possible. Without flow, there is no "going." Adding auxiliary agitation to help feed the disperser blades can extend the operating range of the disperser. This type of machine, often called a twin-shaft or triple-shaft mixer, has one shaft with a slow-moving sweeper blade that moves against or scrapes the tank walls to facilitate mass flow, and one or more blades with dispersing Additional mixing shaft for machine blades to generate high shear.
