Extrusion International 3-2024

33 Extrusion International 3/2024 and a robust vacuum system to remove volatile con- taminants. The Multi Rotation System (MRS) is preceded by a melt extruder, which separates the plasticizing and degassing/ deodorizing/ decontamination process steps so that the process parameters can be optimized indi- vidually for each process step. Downstream of the melt extruder, the RSF genius fil - tration system removes hard contaminants by ultra-fine filtration. Its fully automatic operation with guaranteed pressure and process consistency cleans the contaminat- ed screens directly before they re-enter the melt chan- nel, so that the screens can be automatically reused up to 400 times. Typical filtration finenesses in HDPE recycling are 125 to 300 µm. In addition, for milk bottle recycling, the ma - terial can optionally be fed into the extruder via a 3C Rotary Feeder. The flexibility of the recycling system is outstanding: the OMNI max system compensates fully automatically for variations in the plastic waste to be processed in terms of moisture, contamination, viscosity, bulk den - sity, etc. by adjusting the process parameters so that material of consistently high quality can be produced. Material changes, e.g. for batch changes, are possible within minutes due to the short residence time, so that the flexibility requirements of a new recycling plant are fully met, and production interruptions can be re - duced to a minimum. This unique feature makes the OMNI max recycling system exceptionally cost-effec- tive, especially in applications where food contact or odor reduction is required. In addition, the technologies developed and patented by Gneuss are characterized by: • Compact design, small footprint • Short residence time • High flexibility • Low energy consumption • High economic efficiency • High cleaning efficiency (super-clean), also for food contact Gneuss Kunststofftechnik GmbH Moenichhusen 42, 32549 Bad Oeynhausen, Germany www.gneuss.com EXTRUSION TECHNOLOGIES, RECYCLING Results of the HDPE challenge tests, submitted 2024