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Machine principle

The RingExtruder-RE with 12 screw shafts is the evolutionary further development of the well-known co-rotating twin screw extruder, where the screws are tightly intermeshing.

12 screw shafts arranged symmetrically in a ring rotate in the same direction each on its own axis. The outer barrel and the stationary core enclose the screws with a narrow gap. Transportation of material takes place in a double helix: around the stationary core and around each screw. The process chamber in the transfer zone from screw to screw that is not influenced by the barrel, often called the "intermeshing section", is used extensively in the RingExtruder RE as the central point of the process technology. The system works more economically, with lower degradation of the polymer chain and better dispersion. In the intermeshing section, material is transferred to the adjacent screw by means of a change in flow direction across the flow, a 3D elongation flow is generated in the volume of the intermeshing section. This results in an exchange of material without partial overloading, as well as an excellent dispersion, wetting and homogenization effect.

The arrangement of the screw shafts in a ring largely compensates in the RE for the known spreading forces found in the twin screw via the two adjacent screws. This reduces barrel and screw wear in the RingExtruder.