Extrusion International USA 5-2019

31 Extrusion International 5/2019 nation of the proven MAS-CDF disc filter and a specifically developed and patented MAS single-screw degassing ex- truder (Picture 3 ). This allows existing single- or twin-screw extruders to be upgraded to a cascade extrusion line. The MAS cascade package is more than just a retrofit op- tion. It also offers a procedural innovation. It is the pat- ented division of the melt stream coming from the filter into a series of individual streams in a multi-channel melt distribution manifold, through which the polymer melt coming from the initial extruder and after having passed the filter is fed into the degassing zone of the single-screw extruder (Picture 4). The division into individual streams has the effect that the polymer mixture can be degassed more efficiently and thus has a more homogeneous ma- terial density. Several production applications with PE and PP materials have shown that after retrofitting the cascade package the throughput of the recycling line raises by 40 to 50 percent over the initial constellation. Concurrent, the more homogeneous extrudate increased the bulk den- sity of the regenerated material by up to 15 percent. This in turn has the consequence that the weight amount per transport unit increases, whereby the transport volume and the associated transport costs decrease and thus con- tribute to a higher added value. All in all, the MAS cascade retrofit package is an efficient way to increase the performance of existing recycling plants which is economically complemented by a short re- turn on invest. MAS Maschinen- und Anlagenbau Schulz GmbH A-4055 Pucking, Österreich www.mas-austria.com K 2019: Hall 9, Booth D42 Trans Formation create 3A92 www.kampf.de Picture 3: MAS cascade retrofit package consisting of MAS-CDF-disk- melt-filter with subsequent melt line to a multi-channel melt-feed- manifold andMAS single-screw degassing extruder Picture 4: Cross section through the “multi-channel melt-feedmanifold” in which the melt stream coming from the melt filter is divided into individual streams in the direction of the degassing zone of the cascade extruder