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Chapter 9. Plasticating Extruder (Donovan Model) |
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[Simulation Analysis for Polymer Processing by PC (6), Japan Plastics, Vol.50, No.4, P.122 (1999)]
After Tadmor model was published, many theoretical models of plasticating extrusion have been made public. Among them, Donovan model improves Tadmor model substantially. Tadmor model assumes that the solid bed velocity in down channel direction (z) is constant, and the thickness of the solid bed is infinite as for heat transfer. On the contrally Donovan model [7] allows the solid bed to accelerate during melting by introducing SBAP (solid bed acceleration parameter), and takes into account the heat transfer from the screw by dealing the solid bed with finite thickness. In this chapter, theory of Donovan model is explained by contrasting with Tadmor model, and a calculation example using Donovan model is shown as well. [7] Donovan, R. C., Polym. Eng. & Sci., 11 (3), 247 ('71) |