Batch mixers consist of one or more loading inlets and one central outlet. Once the materials are loaded into the mixer, the mixing process starts and lasts as long as necessary for perfect mixing. The design and rotational speed of the mixing tools create a centrifugal vortex motion that allows materials to be thrown three-dimensionally and to mix with each other. This ensures that components with different grain sizes and densities are perfectly mixed within the shortest possible time.

Batch mixers can be:

• Ploughshare mixers: i.e. with a full mixing rotor and staggered ploughshares placed on it. The ploughshare-shaped mixing tools rotate on the central shaft inside the cylindrical horizontal chamber. The turbulence created prevents the formation of dead zones by constantly involving all particles in the mixing process. Despite their low speeds, these machines ensure high mixing accuracy.
• Ribbon mixers: these consist of a rotor shaft with opposing spirals housed in a mixing chamber of the mixer. The spiral on the outermost diameter conveys the material from the edges inwards, conversely, the spiral on the smaller diameter conveys the material outwards to the sides, producing a kind of convective mixing. The product is mixed gently in relatively short mixing times.