2SORTING PROCESSES Waste to treatment Companies that connect their packages to the Ecoembes IMS identify them with the “Green Dot”. This forms part of their legal obligations. Waste generated in light weight packaging sorting plants is obtained from the selective collection of yellow containers, where members of the public deposit domestic light packages. These are plastic, metal and food and drink carton packages or beverage carton. The containers contain impurities or unsolicited material which must be separated from the requested materials during the sorting process. Requested materials: HDPE (high density polyethylene), PET (polyethylene terephthalate), LDPE (low density polyethylene, generally in film form) and the mixed plastic fraction composed of materials made of PS (polystyrene), PP (polypropylene) and other plastics; also included are aluminium and steel packages, as well as beverage carton (hereinafter BC). Unsolicited materials: Cardboard, celluloses, P/C, low and high density film plastics and other impurities such as glass, textile wood, non-packaging plastic, organic matter, other metals, etc. It is essential to perform quality control on the collected waste arriving at sorting plants in order to ascertain the quality of the selective collection, obtain the necessary data to calculate effectiveness, as an indicator of proper function of the sorting plants, and ascertain the stream of materials in the sorting processes and the potential for packaging recovery through selective collection. For this purpose a statistically representative analysis is performed of the waste known as characterisation (Point 3).
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