Impact of Neutral Kneading Blocks in Twin-Screw Extrusion on Polymer Blends and Composites: A Ludovic Simulation Study
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The environmental crisis from plastic waste necessitates advanced recycling technologies, especially for PET and PP. PET, comprising 18% of global plastic, has low recycling rates, while recycled PP often suffers in quality. Twin-screw extrusion (TSE) is prevalent in recycling, with neutral kneading blocks(NKBs) in the kneading zone enhancing shear forces and ensuring a uniform residence time distribution, leading to consistent material properties. Using Ludovic software, this study simulates the TSE process to optimize conditions for a recycled PET/PP blend, improving efficiency and quality. Two flame-retardant composites, ANF/rPET-rPP and clay/rPET-rPP, were formulated. Scanning Electron Microscopy assessed additive dispersibility, while Thermogravimetric Analysis and Differential Scanning Calorimetry evaluated flame retardancy. The study underscores NKBs' potential in reducing energy consumption and boosting productivity for high-quality composite production.