Mixed Harmony: Precision Mixers for Instant Food and Beverage Powders

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Italvacuum, Srl

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Angst+Pfister AG

amixon GmbH

On account of the flow without dead spaces, technically ideal mixing qualities are achieved after about 70 to 200 revolutions of the mixer. These mixtures can practically not be improved anymore. The mixing process that takes place here can be defined as “distributive mixing”. The peripheral speed of the mixing tool (measured in the cylinder part) is usually adjustable between 0,5 m/s to 2,5 m/s. The design allows ideal mixture qualities to be achieved even from a filling level of just 5 %.

Mixing: Successively or at the Same Time

Occasionally, however, the user desires supplementary preparation steps, such as dilumping, dispersing or agglomeration. Here, additionally shearing and rubbing effects take place with increased energy input. In Amixon-mixers, this is done on the one hand by increasing the rotary speed of the mixing device and on the other by the use of additional shear dispersers. As such, a particularly gentle “homogeniser” for distributive mixing and an “intensive disperser” for dispersive mixing are available in one and the same mixer.

The feeding of the mixer with individual components takes place via one or more connecting pieces above the mixing chamber either successively or at the same time. The mixer can be stationary — if the mixer is located on weighing cells and functions as a dosing weigher — or it can be rotating if batches are mixed quickly one after the other without interruption.

Once the mixing process is complete (circa 2 to 6 min) a dead-space-free valve in the base opens and the mixture flows downwards through the discharge connecting piece of the mixer. This discharge procedure is segregation-free and the size of the volumetric flow is given by the dimension of the sealing valve. Due to the conical design, the bulk materials are discharged — usually completely — without segregation with the mixing tool rotating slowly.

Free of Dust and Contamination – A Must for Food and Beverage

The particularly solid manufactured mixing tool usually uses a single top bearing and is driven from the top. A particularly hygienic shaft seal guarantees operation free of dust and contamination, even at different system pressures inside the mixing chamber. Hence, for example, a vacuum is present when the mixture is drawn in by suction pneumatics. In special cases the mixing chamber is freed of atmospheric oxygen before feeding by generating a vacuum of approximately 10 mbar absolute pressure.

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