Plastic Sorting & Light Packaging

Plant description

Film, plastic bottles, packaging etc. are to be found in our consuming and economic goods every day. A very important precondition for the further treatment of these synthetics is towards raw material and resource processing. For the production of recyclables and secondary raw materials is the unmix, as well as the cleanness of these plastics.

Our sorting plants separate this plastic scrap and fractionate it into potential recyclables by means of mechanical and automatic sorting technologies. The Ballistic Separator for example has become a DSD’s core unit of modern sorting plants due to its huge versatility of application.

The positioning of the STADLER Ballistic Separator in the pre-selection for instance enables the division of the material stream into a “flat-light” and a “rolling-heavy” fraction at the outset of the whole process. The progressive optimisation of sorting plants with regard to the classification of polymers strongly profits by the use of ballistic separators before near-infrared treatment.

All plastic bottles and hollow bodies sorted out are further treated on a following processing plant for bottles. The material is being washed and grinded. By sink-float separation, which is a wet process based on the varying specific weights of the different synthetics to make a further quality control. Finally the dried mill material is to be grinded once more.

Conceptual reasons
The high degree of purity of the “rolling-heavy” fraction, being produced with the ballistic separator, offers an almost fully automatic sorting of the polymers by optical detection techniques. Clean PET bottles are valuable raw materials, which can be easily merchandised for further production of high quality products. In a Plastic sorting and light packaging Recovery process there are some simple process depending on material composition

1) The bags with the light packaging are opened in a bag opener. Afterwards all troubling substances are taken out. A downstream ballistic separator fractionates the materials according to their form. By magnetic and eddy-current technology as well as air separators and optical identification all potential recyclables are sorted into PET, PE, PP, PVC, brick, Fe, Alu, paper and cardboard.

At the end of the sorting process the different materials are pressed into bales and thus prepared for the recycling.

2) Automatic treatment of the light packaging by auger fillers, ballistic separators, ferrous and non-ferrous and air separators as well as optical identification discharging all troubling materials at the same time. Particularly in the area of PET separation a very high purity and recover-ability can be obtained due to the differentiation of colours.

Furthermore various film fractions with different sizes as well as a PE/PP mix are being produced as potential recyclables.