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Flow analysis of profile extrusion by a modified cross-sectional numerical method

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Abstract

Flow analysis of profile extrusion is essential for design and production of a profile extrusion die. Velocity, pressure, and temperature distribution in an extrusion die are predicted and compared with the experimental results. A two dimensional numerical method is proposed for three dimensional analysis of the flow field within the profile extrusion die by applying a modified cross-sectional numerical method. Since the cross-sectional shape of the die is varied gradually, it is assumed that the pressure is constant within a cross-sectional plane that is perpendicular to the flow direction. With this assumption, the velocity component in the cross-sectional direction is neglected. The exact cross-sectional shape at any position is calculated based on the geometry of standard cross-sections. The momentum and energy equations are solved with proper boundary conditions at a cross-section and then the same calculation is carried out for the next cross-section using the current calculated values. An L-shaped profile extrusion die is produced and employed for experimental investigation using a commercially available polypropylene. Numerical prediction for the varying cross-sectional shape provides better results than the previous studies and is in good agreement with the experimental results.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Seoul National University, 151-742, Seoul, Korea

    Dongjin Seo & Jae Ryoun Youn

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  1. Dongjin Seo
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  2. Jae Ryoun Youn
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Correspondence to Jae Ryoun Youn.

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Seo, D., Youn, J.R. Flow analysis of profile extrusion by a modified cross-sectional numerical method. Fibers Polym 1, 103–110 (2000). https://doi.org/10.1007/BF02875193

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  • DOI: https://doi.org/10.1007/BF02875193

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