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Stott Hygienic Bulk Packaging Systems

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Vrieco-Nauta Centro Screw Mixer (CM-Series)

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Vrieco-Nauta Centro Screw Mixer (CM-Series)


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The Hosokawa Centro Screw Mixer ( CM-Series) is specifically designed for the homogenization of big batches of free flowing powders with different particle sizes and bulk densities.

The design of the CM mixer is based on the principle of creating a mass flow within the partially conical shaped mixing vessel. Products to be mixed are conveyed upwards by a conveying screw positioned in a central mounted guiding pipe. A guiding cone is provided on top of the central pipe. This cone distributes the product on top of the batch surface.

The combination of the conical vessel shape and the unique product inlet head of the guiding pipe create velocity differences in product flows within the batch resulting in an efficient mixing method without any product distortion.

The typical speed of the central screw is 70 to 80 RPM. The tip speed can fluctuate from 1 to 3 m/s.

Ideal for mixing powders and powders or powders and liquids.

The principle behind the convective mixing effect is as follows:

The mixing screw conveys the material upwards within the central guiding pipe
The conical shaped cone distributes the product on the batch surface
The complete batch of product sinks by gravity (mass flow)

Main Features of the Centroscrew Mixer are:

Mixing Accuracy: A high mixing accuracy can be achieved depending on the state and shape of the various materials. The conical shaped vessel with the central screw will guarantee mass flow discharge characteristics.

Free Flowing Powders: This type of mixer is used for mixing big batches of free flowing powders in the shortest amount of time.

Mixer Design: The CM mixer is characterized by its compact and reliable design. It is available in sizes ranging from 1,000 to 100,000 liters all produced in cantilevered designs.

Process Flexibility: The CM mixer has a flexible working capacity ranging from 50-100% of its filling rate while maintaining its mixing accuracy.

Fragile Components: The mixing process is achieved using minimal energy without generating heat and /or damaging product structures.

Fast and Full Discharge: The partial conical design in combination with the central bottom outlet guarantees a full discharge with a minimum amount of product remaining after discharge. Discharge rates of up to 40,000 liters/hr are possible. Levels of residues after discharge of 015 can be achieved depending on product characteristics.