Extrusion Asia Edition 1-2021

23 Extrusion Asia Edition 1/2021 ➠ Herbold Meckesheim GmbH Industriestr. 33, 74909 Meckesheim, Germany www.herbold.com ing or fibers winding around the rotor as the guillotine rotor, with its open design, only nibbles at the material that is fed via the hydraulic ram. Hence, it literally digests the long fibers trouble-free. Lastly, manufacturers will also benefit from its space-saving design as only one size-reduction step is necessa- ry. Boost for the material’s bulk density What do the first angled flights of the extruder screw need to push the plastic downstream? They need the right size, surface and a high bulk density of the materials. These factors will have a tremendous influence on the output of the extruder. Having coped with lots of projects concerning the agglomeration of plastics, Herbold has continuously developed its HV Plastcom- pactor in order to deal with the majority of thermoplastic poly- mers in different appearances. But what about the reprocessing of fibers? Once the fibers are size-reduced, they should be ag- glomerated. This step is done by the HV Plastcompactor which increases the bulk density and improves the flow properties of the material. To a great extent, the process is associated with gently exercis- ed friction on the material – this in turn has two effects: agglo- meration and evaporation of residual moisture and spinning oils down to a level which makes the material suitable for ex- trusion. Depending on the specifications, bulk density can be increased up to eight times. Furthermore, the HV Plastcompactor creates a plastic which is excellent for dosing and mixing. This inline-solution improves the energy balance as well as the throughput of the extruder compared to straight infeeding without prior treatment. Cus- tomers stated that their savings on energy consumption were up to 30%. Expectations and importance What can a manufacturer expect by having a granulator-agglo- merator-line running in his halls? First and foremost, to partici- pate in the prevailing and apparently ongoing trend of increas- ing demands for higher recycling rates in their products. This is realised by making resulting waste volumes of fibers, filaments or nonwovens applicable for internal recycling. It takes a proper downsizing step such as the Herbold Granulator of the HB se- ries as well as an appliance which can deal with the prevailing high volumes, namely the HV Plastcompactor. The machine en- ables an increase of bulk density of up to eight times. This con- cept has already been realized and their efficiency witnessed by custom- ers, who claimed that energy-savings up to 30% had been achieved. Ulti- mately, Herbold Meckesheim is pleased to be able to help customers with these demanding applications and is looking forward to support manufacturers of PET fibers, fila- ments or nonwovens with their tar- geted recycling ambitions. 已安装生产线概念的示例（精简和团聚） Example of installed line concept (downsizing and agglomeration) 团聚的PET纤维 PET fibers agglomerated 约7.7米 Approx. 7,7m 约24米 Approx. 24m 约10米 Approx. 10m