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International audience witnessed  the innovative LSP technology in action at NGR – KUHNE PET day.
International audience witnessed the innovative LSP technology in action at NGR – KUHNE PET day.

More than 117 representatives of the plastics industry from 24 countries recently met for an open day at the Upper Austrian mechanical engineering company Next Generation Recycling Machines (NGR).

In cooperation with the German machine supplier and extrusion specialist KUHNE GmbH, an innovative recycling process for polyethylene terephthalate (PET) was demonstrated to the interested audience.

Previous methods of recycling PET back to near-virgin quality have shown limitations. The LSP (Liquid State Polycondensation) recycling method developed by NGR now opens up completely new possibilities for the plastics industry.

Achieving food grade standards, decontamination and rebuilding of the molecular chain structure takes place in the liquid phase of the PET in the LSP process. This principle allows recyclers more flexibility with regard to the input materials.

Different forms of PET waste can be mixed and recycled. This means not only bottle flake, but also scrap fiber, sheet, thermoform waste, strapping, and other lower value scrap streams can be recycled to much higher IV and higher value recycled products.

The NGR process at the outlet provides controlled mechanical properties of the recycled PET. Furthermore, LSP can be used to process co-polymer forms of PET (PET-G) and polyolefin contents (e.g. PE) without any problems.

After the melt has passed the LSP reactor, it can either be granulated or – like at the demonstration in Feldkirchen – processed to FDA approved film with outstanding optical and mechanical properties by implementing devices such as a sheet die, a roll stack, cutting devices or a winder. These films are mainly used for thermoforming applications.

"The fact that representatives have joined us in Feldkirchen shows that with the Liquid State Polycondensation we at NGR have developed an innovation that will help to get the worldwide problem of plastic waste under control," said Josef Hochreiter, CEO of Next Generation Recycling Machines.

With the NGR – LSP concept and the follow – up KUHNE extrusion, our customers worldwide now have an energy-efficient, alternative solution in order to produce highly-sophisticated packaging films out of PET with originally bad physical properties, said Rainer Bobowk, Division Manager at KUHNE Maschinenbau.

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