The controlled concentration of PVC in PET flakes is essential in the plastics recycling process for most PET cleaning and recycling plants. This is because of the low melting point of PVC, which can cause clogging of the nozzles and increased breakage rates due to premature melting and carbonisation during the PET production spinning process, which can result in a large number of black spots in the product and affect the quality of the PET product. However, most high-end applications (e.g. the production of high-grade polyester fibres) require a PVC concentration of well below 50 ppm. therefore, in order to sell to high-end users at a high price, PET recyclers must make an extra effort toremove PVC from the PET flakes produced. How to remove PVC from PET flakes? PVC is difficult to identify with the naked eye as it is almost the same colour as PET, and even more difficult to remove when crushed into flakes. Due to the difference in melting point, PVC is the "numb...

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