PET RECYCLING | TECHNOLOGY
rated with SSP. Further purification in the molten state occurs later in a Bandera twin-screw extruder. “The final result is a material with properties equal to virgin PET and free from contamination, FDA/ EFSA approved,” he says. “All this in shorter times and with energy expenditure greatly reduced, in some cases halved, compared to market stand- ards.”
Austrian equipment builder MAS has an unusual
take on twin-screw extruder design, with its conical co-rotating system. Most of its units are used for plastics recycling, particularly PET recycling. A key point with this design, says Stefan Lehner, the company’s General Sales Manager, is that they can accept large volumes at the input zone, which is ideal for regrind, especially flakes. The units provide high throughput with low
screw speed, and also a very low shear rate. Plus, the short processing unit of the MAS and hence the low dwell time of the melt inside the extruder are key features for achieving good colour and AA values, Lehner says. MAS extruders are particularly energy-efficient,
Lehner also notes. This is due to the low residence times and installed extruder heating power required
Left: MAS co-rotating conical twin-screw extruders have large intake openings
is also very low. “As a result, the MAS extruder requires significantly lower specific energy than parallel twin-screw extruders,” he says. An energy saving of up to 20% is possible, says the company. In order to be able to meet growing require- ments for PET packaging sheet with high rPET content, many processors are confronted with high investment costs for equipment that can process recycled materials. Gneuss says it has already proven to many customers worldwide that retrofitting is a good alternative for processing recycled materials. “For
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Whether it is inhouse, post- consumer or bottle recycling: you can only close loops in a precise and profi table way if machines are perfectly tuned for the respective application. Count on the number 1 technology from EREMA when doing so: over 6000 of our machines and systems produce around 14.5 million tonnes of high-quality pellets like this every year – in a highly effi cient and energy-saving way.
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IMAGE: MAS
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