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Analytical and Numerical Methods for the Design of Maddock Mixers in Single Screw Plasticizing Technology

Authors

  • Michael Olbrich,

    Corresponding author
    1. School of Engineering and Environmental Sciences, Upper Austria University of Applied Sciences, Stelzhamerstraße 23, 4600 Wels, Austria
    • School of Engineering and Environmental Sciences, Upper Austria University of Applied Sciences, Stelzhamerstraße 23, 4600 Wels, Austria.
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  • Gernot Zitzenbacher,

    1. School of Engineering and Environmental Sciences, Upper Austria University of Applied Sciences, Stelzhamerstraße 23, 4600 Wels, Austria
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  • Christoph Hochenauer,

    1. School of Engineering and Environmental Sciences, Upper Austria University of Applied Sciences, Stelzhamerstraße 23, 4600 Wels, Austria
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  • Christian Kneidinger,

    1. School of Engineering and Environmental Sciences, Upper Austria University of Applied Sciences, Stelzhamerstraße 23, 4600 Wels, Austria
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  • Vincent Lawlor

    1. School of Engineering and Environmental Sciences, Upper Austria University of Applied Sciences, Stelzhamerstraße 23, 4600 Wels, Austria
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Abstract

Summary: In single screw plasticizing technology dispersive mixing elements, i.e., axial and spiral Maddock shear heads, are often used to improve the melt quality. Mathematical models are necessary to efficiently design the mixing section. An analytical model for the design of Maddock mixers is presented in this work. In addition, a CFD-software package is employed to determine the flow and pressure field for different geometries and processing conditions. For the design and process analysis of fluted dispersive mixers the validity and potential of simplified analytical solutions are compared to more versatile and detailed CFD-simulations.

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