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Flake Sorting: PVC in PET

Energy consumption at the primary production of PET is very high: 36,5 MJ/kg. In comparison the energy consumption of recyclet PET is 3,356 MJ/kg. Beside the huge amount of Energy which can be saved also the CO2 production can be reduced dramatically.      

Problem

Due to different physical and chemical characteristics small amounts of PVC can have a negative impact on the product. Since the densities of both polymers can overlap a separation by a floating system is not possible. Furthermore, the PET melting temperature (250–260 °C) is way higher than from PVC (140–160 °C). Additionally, PVC can generate hazardous chlorinated compounds during the melting process. Also, a separation by a color camera is not possible since recycled plastics come in different colors.

Solution

Detection by EVK chemical Imaging systems since several characteristics in the spectrum are present that clearly distinguish PET from PVC.

Plastic flakes
PET
PVC
Application Scan Plastic flakes Application Plastic flakes
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Technology

Near Infrared Hyperspectral Imaging offers the degree of classification accuracy necessary for Recycling applications, by directly measuring the chemical molecular composition through the absorption of light (spectroscopy). 

EVK’s portfolio of sensor-based sorting technology includes Colour, Hyperspectral and Inductive sensor systems, which can be used individually or, with Sensor- Fusion, can be combined to form a powerful sorting application that can process multiple material types.

Hyperspectral Imaging
Sensor Fusion

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