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Flexible plastics separator from Hamos

Archiv – Hamos of Penzberg in Germany has introduced an EKS-PET electrostatic separator which, it is claimed, is capable of removing virtually all PVC from shredded, washed and dried PET flakes to produce a clean fraction.Hamos of Penzberg in Germany has introduced an EKS-PET electrostatic separator which, it is claimed, is capable of removing virtually all PVC from shredded, washed and dried PET flakes to produce a clean fraction.
Clean PET flakes represent a valuable raw material that is suitable for use in the manufacture of high-quality products. However, even very low amounts of PVC can contaminate the material and prevent use of the flakes in high-grade applications such as the production of new PET bottles.
A supplier of equipment and systems for recycling and separating plastics, cable, electronic waste and composite materials, Hamos says separation of PVC from PET is by no means easy. Conventional sink-float separation equipment does not work, the company claims, because the difference between the densities of the two substances is too small. Meanwhile, separation of entire bottles with the aid of near infra-red (NIR) technologies or manual sorting is not 100% successful, with a certain amount of PVC or other contaminants often going unidentified, the company adds.
With the EKS-PET electrostatic separator, the mixture of PET and PVC is tribo-electrically charged, with the PET particles taking on a positive charge and the PVC particles a negative one. This effect occurs as a result of the passage of electrons from one particle to another. After charging, the PVC particles are separated electrostatically from the PET fraction via a high voltage field.
Due to the almost complete removal of PVC contamination, the EKS-PET electrostatic separator delivers PET of a ’very high’ purity, according to Hamos. The flakes can be used in the production of, for example, new bottles, high-grade fibres or films.
The ‘€˜extremely flexible’€™ EKS-PET separator also enables users to achieve separation of other mixtures, including HDPE/PP, PS/ABS, PVC/PE and PVC/rubber. Separator throughputs vary from 750 to 3000 kg per hour depending on the size of the machine.

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