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Technology

Revolution in recycling: Machine learning now distinguishes 12 types of plastics

A gigantic step to seriously start the long journey towards recycling and using 100% of plastic waste.

January 14 2022
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Recycling

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The plastic recycling process is more complex than it might seem.

Despite common thinking, the plastic it cannot be defined as a mere "material". Inside there are different polymers, to which chemical compounds, fibers and pigments are added.

The combination of all these elements makes the separation of the plastic and the identification of the type of belonging quite complex.

To facilitate the whole process, researchers from the Department of Chemical and Biological Engineering of Aarhus University have managed to develop a camera system.

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The cameras would be able to "see" the difference between 12 different types of plastic (PE, PP, PET, PS, PVC, PVDF, POM, PEEK, ABS, PMMA, PC and PA12), completely transforming recycling.

Recycling meets Artificial Intelligence

The Aarhus University study was published in the journal Vibrational Spectroscopy. Professor Mogens Hinge, the project director, explained the potential of the new camera system.

"With this technology, we can now see the difference between all types of consumer plastics and different high-performance plastics. We can even see the difference between plastics which are made from the same chemical building blocks, but which are structured slightly differently."

These are his words, which make us think of a clear improvement in the recycling process of plastic. The studied technology has already been tested on a pilot scale, and is expected to be implemented at PLASTIX and Dansk Affaldsminimering Aps in spring 2022.

“We use a hyperspectral camera in the infrared area and machine learning to analyze and classify the type of plastic directly on the conveyor belt. The plastic can therefore be separated into different types. This is a breakthrough that will have a huge impact on the separation of plastic "

Professor Mogens Hinge, project director at the University of Aarhus
It's easy to say "plastic recycling": there are many types, and the difficulty increases.

Plastic recycling

Currently, plastics are separated using near infrared (NIR) technology; alternatively, a density test is used (floats / sinks in water).

Both methods are capable of separating some plastic fractions (ex: PE, PP and PET), but they do not have the same precision as Professor Mogens Hinge's new recycling technology.

Hans Axel Kristensen, CEO of the PLASTIX company - which collaborates on the project - confirmed the advantages of the new infrared system, stating that:

"The technology we have developed in collaboration with the university is nothing short of a breakthrough for our plastics recycling capacity. We look forward to installing the technology in our processing room and starting the long journey in earnest. towards the use of 100% of plastic waste."

Through the new technology, it may be possible to effectively differentiate different types of plastics, paving the way for a safer and more environmentally friendly system.

In the conventional industry, plastics must be at least 96% pure by type of polymer in order to be recycled. The University project would lead this percentage to drop significantly.

Tags: plasticrecycling

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