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How to get premium, clean plastic fractions in 3 steps

Recyclates that are barely distinguishable from virgin material – that’s what plastics processing specialist Lindner had in mind when developing the new hot-wash system to be presented at the K Show 2019 in Düsseldorf, Germany. In addition to effective cleaning, the solution offers not only high but above all continuous output.

‘Gone are the days when products made of recycled plastics were a well-intentioned but marginal phenomenon,’ says Lindner. ‘Markets, and in particular big brands, have to react to the sustainability trend and are demanding ever-higher quality recyclates in ever-increasing quantities.’ To deliver this high quality, complex processing systems and washing technologies – are needed. The supplier recognises undesirable materials getting stuck to post-commercial and post-consumer film as well as unpleasant odours are particular challenges.

Three stages to success

So what is the answer? According to Lindner, its new three-stage hot wash system is able to meet increasingly tough requirements while ensuring high productivity. ‘When developing the new components, we focused on effective cleaning and continuous processing so that all preceding and subsequent equipment can be operated productively at all times,’ comments Harald Hoffmann, managing director of Lindner Washtech.

‘That is why we based this solution on our tried-and-tested technology, combined it with the advantages of hot washing and deliberately left out the otherwise common, but often vulnerable, batch processing,’ he adds.

The modular and compact Lindner hot-wash system does not require any additional conveyors. In the first stage, the shredded and pre-washed plastics are fed into a reactor, mixed with hot water and washed. Already at this stage, mixing arms apply concentrated friction to the material.

The double discharge screw conveyor then feeds the plastics into the new hot-wash rafter in optimally dosed quantities. This is a new and improved version of the already successful rafter pre-washer, in which continuous friction is applied to the material to remove and separate residues effectively and gently. In the third and final stage, the Twister friction washer, a machine specifically designed for this application, removes the hot water or the hot caustic solution. The liquid is then separately treated.

There is another option: the system can also be operated with a caustic solution to remove even stubborn fat and oil residues, as well as glue. The downstream water treatment system continuously monitors the water’s alkaline content and automatically applies the necessary chemicals.

Where to find it?

Lindner is exhibiting its innovative solutions in hall 9, at booth D78/E75. The company is also taking part in the live demonstrations, organised twice a day in the outdoors area (spot 15.2).

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