Extrusion International 1-2019

45 Extrusion International 1/2019 uously working disc filter (type: MAS CDF 500-D) separates particles down to 250 μmand a second filter after the second extruder all impurities down to 90 μm. In this constellation, the sys- tem, supplied by two DRDs, reaches an output of up to 1300 kg/h (Images 4, 5 and 6 and Factbox MAS recycling technology). When an English recycling company ceased operations due to economic problems, Daalder acquired a second MAS-93 cascade line and purchased two more DRD dryers. A short time later, he invested in the thirdMAS-line, achieving a total annual production ca- pacity of 33,500 t of polyethylene gran- ules with an MFI of 0.4 to 1.4 g/10 min (190°C and 2.16 kg) for blow molding applications in the colors gray, black and light brown, referred to as “tea color”. The recycled materials have a high tensile strength and are suitable for the production of tear-resistant garbage bags and drawstring bags. Expectations fully met! Looking back on three years of prac- tical experience, MAS technology has fully met the expectations set in it. Peter Daalder again: “Not only the output and the stability of the produc- tion system has met our expectations, but also the long-term performance, after all, our systems are operated around the clock in a 4-shift system. Our first line has now completed more than 30,000 hours without ma- jor problems (Image 7). That moti- vated us to invest in the fourth plant, which has gone into full operation by the end of 2018. Overall we see an ap- proval of our approach to rely on the local production of recycled granules. We want to continue on our path by expanding our offer to recycling natural-based plastics as well as PP, PS or PS impact-resistant. By 2020, we want to expand production capacity to 100,000 tons per year. Because in Europe the recycling-future has just begun.” Author: Reinhard Bauer - TECHNOKOMM office@technokomm.at MAS Maschinen- und Anlagenbau Schulz GmbH A-4055 Pucking, Austria www.mas-austria.com DALY Plastics Plasticrecycling BV Industrieweg 101a, NL-7202 CA Zutphen, The Netherlands www.dalyplastics.nl MAS recycling technology Image 1: The functional principle of theMAS dry cleaning system for filmflakes: The batch-wise processed filmflakes are forced through a 2-stage rotor into a turbulent warm air flow. In the process, moisture is separated off and dirt particles are detached and separated by centrifugal force due to the resulting frictional heat Image 2: At the heart of theMAS extrusion technology is the conical twin-screw extruder with co-rotating screws developed by its founder Helmuth Schulz. Advantages of this type of extruder are the large feed opening, which allows the efficient intake of rawmaterials with low bulk density, as well as the low-pressure plasticization – both prerequisites for gentle recycling Image 3: The configuration of a 2-extruder cascade system consisting of a twin-screw extruder, aMAS disc filter and aMAS single-screw extruder is not only suitable for reprocessing recycled plastics, but also in combination with coordinated conveyors for direct compounding of primary and recycled plastics and additives Graphics: MAS