Application of Gneuss’ MRS Extruder extended

Application of Gneuss’ MRS Extruder extended

Over the last few years, Gneuss´ MRS extruder has established itself as one of the key technologies for processing of engineering polymers without pre-drying. Although originally developed specifically for PET, the MRS is now also running in polyolefin and nylon applications, and testing with other materials promises many more applications in the future.

Over the last few years, Gneuss´ MRS extruder has established itself as one of the key technologies for processing of engineering polymers without pre-drying. Although originally developed specifically for PET, the MRS is now also running in polyolefin and nylon applications, and testing with other materials promises many more applications in the future.

Even fibre coated with spin oils and other contaminants and with high residual moisture level can be fed directly into the extruder without any pre-treatment. Bicomponent (core / sheath etc.) staple fibre can for example be manufactured using the same input material and two different vacuum levels on two MRS extruders to deliver two melts with differing viscosities to the spinning beam. Thanks to the patented combination of single screw extruder -with a multiple screw section, the extruder is very sturdy and particularly well suited for recycling applications.

More than 50 MRS extruders of all sizes, from the MRS 35 for 35 kg/h to the MRS 200 for 2,000 kg/h, are now successfully in operation worldwide. The extremely high devolatilising and decontamination performance of this technology has been especially convincing.

The MRS extruder permits the processing of PET without pre-drying by using a simple water ring vacuum system to process the material directly to high quality end products. This is achieved by means of its unique and patented processing section. Based on a conventional single screw extruder, the multi-rotation section is a drum containing eight satellite single screws, driven by a ring gear and pinion transmission. The ´barrels´ cut into the drum are approximately 30 per cent open and provide optimum exposure of the melt.

Thanks to this design, the devolatilising performance is approximately 50 times greater than that of a conventional single screw extruder´ and this at a vacuum of only 25 to 40 mbar. By avoiding the need for a high vacuum system and pre-drying, the MRS is an economically efficient alternative to conventional technologies. Further arguments in its favour besides energy savings are the simple and rugged design, small footprint, its easy operation and maintenance, processing flexibility and last but not least its excellent melt quality and homogeneity.

Strong and consistent growth in Gneuss´ business division Processing Technology as well as Gneuss´ transformation from an auxiliary equipment supplier to a system supplier has allowed the company to move forward with a sizable expansion of its manufacturing facilities in Bad Oeynhausen, Germany. This expansion will also ensure that there will always be ample space for further research and development.

Gneuss filtration technology
Efficient Melt Filter for fast colour changes and and high throughput rates: With today`s economic pressures, the efficiency of a polymer melt filtration system plays an ever more important role. The Process Constant Melt Filtration Systems from Gneuss, particularly the RSFgenius and SFXmagnus with the unmatched efficiency of its self-cleaning back flushing system, economic efficiency and with regard to the achievable product quality set new standards in the industry.

Worldwide a trend to bigger lines and therefore bigger filtration systems can be seen, so the number of RSFgenius and SFXmagnus systems sold in big sizes has doubled in the last years. The new RSFgenius M model can cope with even higher contamination rates thanks to the synchronisation of the drive and back-flushing mechanism. This further optimises the unique self-cleaning technology resulting in a significant increase of screen capacity as well as a reduction of the quantity of material lost through backflushing.

RSFgenius M filtration systems are now running successfully in recycling applications. Rotary Melt Filtration Systems operate fully-automatically, continuous, proce

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