| (*)Students have comprehensive knowledge of the functional zones in single- and twin-screw extruders and are able to model/predict their main physical processes (i) solids conveying, (ii) melting, and (iii) melt conveying using analytical methods. The knowledge and skills are acquired in close interaction between lecture and practical exercise "Polymer Extrusion and Compounding 2: Modelling Screw Extrusion”, where students collaborate on a competition-oriented single-screw design group project. Students have to design the screw of a grooved bush or smooth single screw extruder, where they have to holistically design and chose values for all the geometric parameters. Given a minimum of boundary conditions and constraints, students have a large degree of freedom to find optimum solutions to this problem by employing analytical modeling techniques and taking reasonable assumptions and simplifications. The final design is assessed by means of functionality, economic and energetic considerations, and sufficient mechanical strength of the screw.
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| (*)Select appropriate extruder configurations / components for particular polymer processing application (K3)
Evaluate the screw extrusion processes including (i) solids conveying, (ii) melting, and (iii) melt conveying (isothermal and non-isothermal) using analytical methods (K4)
Derive relationships between material properties, process parameters, and geometry (e.g., pressure-throughput behavior) (K4)
Evaluate energetic behavior of extruders (K4)
Independently make simplifications and assumptions for modeling based on analytical models (K5)
Apply different rheological and thermodynamic material models (K3)
Critically analyze the calculation results (K5)
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(*)Extruder configurations / components for the most important polymer processing applications (products & raw materials) (K2)
Working principle of extruder screws (e.g., screw characteristic line) (K3)
Special screw designs (K3)
Mixing in screw extrusion (K3)
Common challenges and issues in screw extrusion and how to avoid them (K2)
Different tribological, rheological and thermodynamic models (K2)
Scale-up theory for screw extruders
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