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Mixing elements

Elements largely used for distributive mixing are offered by almost all extruder manufacturers.

Typically, elements with a large number of teeth on a toothed ring, alternating on the two shafts, are used.

These elements are not self-cleaning and, geometrically, vary greatly in the number of teeth, number of teeth rows, width of the teeth, pitch direction, etc.

Another approach is the so-called ZME element. This is based on the use of a single-flight return screw element. Superjacent feed grooves are integrated into the flight, creating mixing teeth.

In the case of an SME element, on the other hand, return grooves are integrated into a double-flight feed element.

A special form of the mixing element is the "Igel" screw. The screw is feed-neutral and almost cuts up the product. The result is a distributive mixing effect, but with relatively few melt stream divisions, in relation to the length.

An SG segment screw comprises several feed-active segments, which are offset from one another. This creates a gentle distributive mixing effect, used in particular for wetting and mixing in fillers and reinforcing agents.

In the barrier screw, the segment screw is combined with a barrier. This produces gentle dispersive mixing by forming a complex elongation flow, without shear or pressure peaks.