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| A line with extruder MRS 90, filtration system RSFgenius 75 and online viscometer VIS |
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At CHINAPLAS this year, Gneuss, a manufacturer of melt filtration equipment, will present the new, energy-efficient Multi Rotation System (MRS) extruder, design enhancements to the established range of Rotary Melt Filtration Systems and its environmentally friendly range of melt temperature and pressure sensors. CHINAPLAS 2011, Asia's leading plastics and rubber trade fair, will be staged from May 17-20 in Guangzhou, Guangdong Province, China.
The MRS extruder from Gneuss is key technology for processing PET bottle flakes. According to the company, more than 15 units of the extruder have been sold for film, fiber and repelletizing applications in Germany, Russia, Brazil, Argentina and North America.
The main advantage of this extruder is that it permits the processing of PET without pre-drying but by using a simple water ring vacuum system to process the PET to a high-quality product. This is achieved by means of its patented processing section. Based on a conventional single screw extruder, the Multi Rotation Section (MRS) 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% open and provide optimum exposure of the melt.
Thanks to this design, the devolatilizing performance is 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.
MRS issued "letter of non objection" by FDA
In addition to the devolatilizing performance, the MRS also offers very good decontamination performance. Even heavily contaminated post consumer waste can be processed to odor neutral products. Earlier this year, the US American Food and Drug Administration (FDA) issued an LNO (letter of non objection) for the MRS extruder for reprocessing material for the food industry. Analyses by the Fraunhofer Institute show, that when processing post consumer material, the devolatilizing performance of the MRS extruder not only efficiently extracts water but also decontaminates the material so that up to 100% PET bottle flakes can be processed to food quality containers.
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