Single-Step Recycling and Compounding
Maschinen- und Anlagenbau Schulz GmbH (MAS), Pucking, Austria, will showcase a co-rotating conical twin-screw extruder, a continuous melt filter with rotating breaker plate system (CDF series) and a dry cleaning system for film flakes.
In a single machine, the conical co-rotating extrusion system features the well-known excellent plastification and homogenization properties of a parallel twin-screw extruder combined to the specific benefits of a conical twin-screw extruder. Thanks to its large system-specific feed opening, the latter is also well suited for materials with low bulk densities and large feed volumes. Further benefits included in the extrusion system are its high conveying and homogeneity performance, extremely gentle material treatment and constant melt pressure. Correspondingly, no melt pump is usually required to stabilize or build up pressures. Low load on the polymer melt, efficient melt filtering and degassing thus also make it possible to process recycled materials. Via the large feed opening, the recycled material can be fed together with a whole range of additives, requiring no side feeder for the additive. In addition, a modular system enables the user to adapt the screw configuration to the respective application. The concept of integrated recycling-compounding plant links the MAS extruder to a Continuous Disk Filter (CDF) and a downstream single-screw degassing extruder, which then transfers the degassed melt to subsequent pelletizing (Fig.). This way, compounding operation is able to achieve a specific energy consumption of only 0.24 kWh/kg if processing 60 % of PP film flakes and 40 % of powder additives.
The CDF filter systems are adapted to the output rate of the MAS extruder and are available at three sizes. With its 3,600 cm³ size, the CDF-500-D is probably the largest continuously operating melt filter, at present, if compared to other filters available at the market. The filter disks are feasible at degrees of fineness ranging from 100 µm to 1,000 µm, and are made of stainless steel.
To complete the system on offer, MAS offers vacuum cleaning chambers to clean the melt conveying parts of the plant for product change. This pyrolytic cleaning process is conducted in a vacuum (approx. 0.5 bar) and at 350 to 450 °C operating temperature.
Fakuma Hall A6, booth 6409
M-A-S Maschinen- und Anlagenbau Schulz GmbH
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