LIGHT WEIGHT PACKAGING SORTING PLANTS 26-27 Pneumatic separation The main objective of pneumatic separation is to clean film and paper from the rolling and light flat material streams, since these hinder the segregation of the remaining materials. The selected material is subjected to a manual quality control to separate impurities. It is subsequently stored to prepare it for dispatch (compaction). Magnetic separation The rolling material stream obtained from ballistic segregation is subjected to segregation of magnetic materials (steel) using over-band separators. Similarly, the fine material fraction from the trommel and ballistic separator are subjected to magnetic material sorting before being sent to the rejected waste fraction. Optical separation The rolling material stream that has not been selected by pneumatic aspiration on this line nor by the magnetic separator is subjected to optical segregation by infra-red or colorimetry detectors to segregate the following requested materials: • PET packaging • HDPE packaging • Beverage carton packaging • Mixed plastic packaging. To improve the performance and quality in the sorting of these materials, the magnetic and pneumatic sorting must take place prior to the optical separation. Induction separation The stream of materials not sorted by the optical separation is subjected to a sorting of non-magnetic metals (aluminium) by an eddy current separator. Manual separation Materials not selected in the rolling and light flat material streams converge on a belt in which they are subjected to manual sorting. The remaining unselected material is sent to the rejected waste fraction. In facilities where sorting operations are performed manually, the material obtained from the trommel is sent directly to the sorting cabin, where operators sort the requested materials.
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