Extrusion International 3-2025

25 Extrusion International 3/2025 Technologies for Closing the Loop in Plastics Compounding and Recycling At Chinaplas Coperion presented key technologies for the entire pro- cess chain of processing plastics and recycling. Coperion showcased two extruders that are ideally suited to current challenges in plastics com- pounding and recycling. The 4th generation STS 75 Mc PLUS twin screwextruderfeaturesanincreased specific torque of 13.6 Nm/cm³, enabling it to achieve up to 20% more throughput with signifi - cantly higher product quality. A ZSK 58 Mc18 twin screw extruder with maximum torque for highest throughput demands, especially designed for products with high torque requirement such as en- gineering plastics, will also be on display. In addition, Coperion high - lighted its reliable and highly ac- curate feeding solutions, including the Coperion K-Tron T35 gravimet- ric feeder paired with a 2415 vacu - um receiver for ingredient refill, as well as a C/S-LW-NS 60 single screw feeder from Colormax Systems. A ProRate PLUS-M feeder, part of the new line of robust gravimetric sin- gle and twin screw feeders, was on display as well. For efficient convey - ing processes, a CVH 550 high pres- sure rotary valve and the two-way diverter valve WEK 265 for granu- lates were shown. For the recycling of plastics Co- perion and Herbold Meckesheim collaborate to provide operators with extensive expertise in technol- ogy and process solutions. At Chi - naplas, they showcased a virtual 3D recycling installation. Visitors to the booth had the opportunity to explore key components of the recycling set up, allowing them to observe the technical details of each process step and the high efficiency of each component. STS Mc PLUS Extruder: Economic and Efficient Solution for Various Applications Over the years, the STS extruder series has established itself on the market as a quality product for a wide range of extrusion and com- pounding tasks such as engineering plastics and masterbatch but also cable masses, the recycling of re- grind plastics, powder coating, and much more. The extruders are pro - duced at Coperion in Nanjing, Chi- na, in accordance with CE guidelines and the highest Coperion standards of quality. They are distinguished by their very attractive price-to-perfor- mance ratio. The STS 75 Mc PLUS presented in the Coperion booth 10K25 is the 4th generation of STS technol - ogy and is equipped with a specific torque of 13.6 Nm/cm³ at screw speeds of up to 900 min -1 . This ad - vancement allows the compounder to deliver enhanced product qual- ity while increasing throughput by up to 20% across all applications compared to earlier models. Key to this performance boost, alongside process-related modifications, is the optimization of the drive’s key components. The STS 75 Mc PLUS extruder features a high-power motor and a gearbox specifically designed to handle high torque. Proven high-performance materi- als are used for the screw shafts to ensure effective torque transmis- sion from the gearbox to the screw elements. The higher fill level in the process section is crucial to the im- proved compound quality achieved by the STS 75 Mc PLUS, as it reduces both shear stress and melt tem- perature while enhancing mixing behavior. This results in an excep - tionally gentle product handling at high throughputs. ZSK Mc18 Extruders: Made for Highest Demands Visitors to the booth could also learn more about the advantages of the renowned ZSK extruder se - ries. These high-performance ex - truders such as the ZSK 58 Mc 18 on display achieve the highest throughput rates and maximum economic efficiency. The extruder with a specific torque of 18 Nm/cm³ is characterized by its consistently high throughput capacity with first-class product quality. With the assembly in China, Coperion is able to react as fast as possible to customer demand. Customers ben - efit from local added value, trans - port and tax savings as well as from shorter delivery times. Complete Plastics Recycling Plants from a Single Source Coperion and Herbold Meckesheim realize plants for a wide variety of plastics recycling applications, excel- ling in their reliability and the high product quality they achieve. From mechanical processing – shredding, washing, separating, drying and agglomerating of plastics – to bulk material handling as well as feed- ing and extrusion all the way to compounding and pelletizing, such plants cover the entire plastics recy- cling process chain. Together, Co - perion and Herbold Meckesheim of- fer solutions for different recycling The Coperion STS 75 Mc PLUS twin screw extruder achieves up to 20% greater throughput with improved product quality, at an increased specific torque of 13.6 Nm/cm³ (Photo: Coperion, Stuttgart Germany)