Extrusion 6-2017

60 Preview Extrusion 6/2017 The boxes used for transporting the scrap from the production plant to the recycling plant are automatically emptied and pre-shred in a special granulator. The Herbold HB series granulator can cope with the complete contents of a box; with the help of a hydraulic ram, the material is fed to the granulator’s ro- tor in portions and load-controlled. After size reduction, the material ground to a size of 20 to 25 mm and in the cur- rent state very soft and fluffy is fed to a Herbold plastcompactor. There the mate- rial is slightly compacted between two grooved discs equipped with kneading bars and the final particle size is achieved with a secondary granulator. The bulk density is increased from approx. 30 g/l to approx. 300 g/l; the good flowing pro- perties allow a return of the material di- rectly to the production process. Due to a particularly gentle recycling, where the IV-value (viscosity) remains almost un- changed, the material can be added to new materials without any restrictions. ( ) Optimized anti-wear protection for granulators : For abrasive materials, such as glass fiber reinforced materials, Herbold Meckesheim offers wear-protec- ted rotors for granulators and a chamber equipped with exchangeable wear parts. This offers considerable cost saving com- pared to time-consuming armour-plating of housing and rotor. ( ) Worthless dust becomes valuable raw material : Many manufacturing proces- ses produce dust and fines, which are se- parated from the production process and are looking for a reclamation. Here some examples: • Fines when recycling post-consumer PET bottles, arising with friction washers and centrifugal dryers n Main Emphasis in Recycling: Herbold Meckesheim’s scope of supply includes single machines and plants for size reduction and agglomeration of clean plastics waste. Herbold’s scope of supply is also comprised of single ma- chines and plants for size reducing, washing, separating, drying, and agglo- merating contaminated, mixed post-con- sumer plastics. Special emphasis is on high-performance plants, i.e. over 3 t/h for rigid plastics or over 1 t/h for films which have recently seen a growing demand. Another focus is on extremely thin films that are parti- cularly difficult to wash, separate and dry. A third key aspect is in regard to ex- treme contaminations, such as sand, stones and soil in agricultural film, or re- maining acid in battery cases. A further focus is on energy-saving recycling of PET bottles for bottle-to-bottle applicati- ons. Another emphasis is on Herbold’s great experience and the diversified scope of supply for retrofitting, upgrad- ing, modernizing and refurbishing exist- ing washing lines that have reached their limits. ( ) Compacting of PET carpet waste from the production of interior lin- ings for cars with the help of the Her- bold Plastcompactor : During the pro- duction of textile interior car linings, pro- duction waste arises in the form of edge trims and faulty parts. It is high-quality waste, generally PET and very volumi- nous.Herbold Meckesheim has delivered a turnkey recycling concept to an inter- nationally leading automotive supplier for the recycling of this scrap. Herbold Meckesheim A6-6511 • Textile flock in textile finishing • Fluffs arising during the recycling of bottle crates which are separated by air separation after size reduction • Textiles or fibres arising when sepa- rating compound materials, e.g. the recycling of used tires Up to now many of these materials en- ded up in combustion, but this is not ideal due to the high calorific value that might damage the waste incineration plants. ( ) Herbold Meckesheim has a different ap- proach to solving the problem: the mate- rial is slightly compacted in the Herbold Plastcompactor and transformed into ag- glomerate with a high bulk density and with excellent flow properties. The mate- rial is processed in continuous operation, between a fixed and a rotating disc, equipped with replaceable kneading bars. The pre-granulated material is con- Picture 1: Hydrocyclone principle Picture 2, left: Carpet waste; interior linings from cars Picture 3, right: Agglomerate, bulk density 300g/l