Filling Level
The Abbe Fluid Zone (Forberg Style) mixer has a very flexible filling level, where the mixer volume describes the working volume and not the total mixer volume. 100% working volume is nominal filling level, and the mixer can work from 40% to 140% filling. The same perfect mixing result will be achieved independent of bulk density and material properties. Add a few seconds more of mixing when operating at the filling borders, but a good mixing result will be achieved.

How the Mixer Works
The two shafts of the Abbe Fluid Zone (Forberg Style) mixer are counter rotating, which lifts the material up in the middle of the mixer, also called the fluidized zone. The angular paddles are welded to the paddle shafts, which give an overlapping rotation in the middle of the mixer and sweeping the entire bottom of the mixer according to specified clearance. In the fluidized zone, the particles have freedom of movement, which again ensures that we achieve a fast and homogeneous mixture.

Liquid Addition - FDB
When liquid is added into fine powder (small particles), an FDB (Flow Distortion Bar) is used. The FDB is a rotor with radial pins. The pins throw the particles at high speed and create a horizontal curtain across the liquid stream. The single particles exposure to the liquid is short and ensures a good distribution of the liquid in the powder.

The mixer should have a filling of approximately 120% when the FDB is used.

Mixing and Breaking with PMS
PMS (Pin Mill Systems) is used when we need to break lumps in the mixture or need higher shear forces during mixing. This system consists of two high speed rotating shafts with welded pins mounted above the fluidized zone.

A hood with intersective pins is placed over the shafts and this ensures a proper stream of product and good crushing effect on the product.

The mixer should have approximately 120% filling when the PMS is used.

Tulip Knives
Tulip knives are mounted in the lower part of the mixer’s end wall and are used for breaking of lumps at low filling. The tulip knives add high shear forces independent of the filling level

Cleaning of the machine is easier with the tulip knives and there is no need for a hood above the fluidized zone, which improve the availability.