Cincinnati Extrusion: RAPIDEX Doubles Output

The Austrian machine manufacturer Cincinnati Extrusion recently introduced the two new single-screw extruder series: Monos and Talos. Now the Viennese engineers have also developed a new high-speed extruder. ‘The results we have achieved with this prototype in our technical lab are very impressive,’ said Josef Dobrowsky, Product Manager of Pipe Extrusion Technology at Cincinnati Extrusion. The traditional definition of a high-speed extruder is an extruder that reaches a peripheral screw speed of more than 1 m/second. As prototype for the test runs, Cincinnati Extrusion chose an extruder with a screw diameter of 60 mm and a processing length of 37 D. The geometries of the screw and the barrel feed zone were modified to suit this special task; the extruder’s drive capacity and its screw speed were doubled. Running at maximum screw speed, an output of 1,000 kg/h was reached in processing PE 100, and an output of 800 kg/h in processing PP, which means the performance was more than doubled compared to conventional extruders. An interesting aspect of this extruder concept is that high output becomes possible with machines substantially reduced in size, which saves space as well as allowing easier handling. A special benefit is that the thermal stress on the melt is kept extremely low, thanks to the short dwell time in the RAPIDEX and the consistently constant melt temperature. Moreover, the high-speed extruder RAPIDEX has proved extremely rigid during the tests, even at its top speed, resisting to back pressures of up to 500 bar. Another important feature of special benefit to processors in daily extrusion practice is the extruder’s linearity, that is its direct proportionality between screw speed and output, which is remarkably consistent across the entire screw speed range and consequently the entire output range.

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