Plastic Deformation of Crystalline Polymers in Solid-State Extrusion through a Tapered Die

  • M. Takayanagi


A theoretical analysis based on the free-body and upper-bound approaches for the solid-state extrusion of crystalline polymers is developed by taking into account their remarkable strain-hardening behavior. The strain-hardening process in uniaxial extension is formulated in a generalized form. The calculations are found to compare favorably with observed extrusion pressures as a function of area reduction of die for linear polyethylene, polypropylene, and nylon 6. The critical area reduction for smooth extrusion is predictable in terms of the unfoldability parameter of folded molecules in lamellar crystals, the strain-hardening parameter, the initial yield stress, and the tenacity of fibers.


True Strain True Stress Crystalline Polymer Area Reduction Extrusion Pressure 
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Copyright information

© Springer Science+Business Media New York 1973

Authors and Affiliations

  • M. Takayanagi
    • 1
  1. 1.Faculty of EngineeringKyushu UniversityFukuokaJapan

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