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Chapter 7. Melt Extruder (Non-Newtonian Flow) |
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[Simulation Analysis for Polymer Processing by PC (5), Japan Plastics, Vol.50, No.3, P.90 (1999)]
Newtonian extrusion theory given in the previous chapter is useful when calculating approx. performance of screw extruder, but non-Newtonian and non-isothermal analysis is necessary for more precise treatments. For example, when extruding high viscosity liquid, viscous heat generation can't be neglected and to know temperature change in extruders becomes very important. For this purpose, non-Newtonian and non-isothermal extrusion shall be considered. Miscellaneous theories of non-Newtonian extrusion have been reported for a long time. When trying to analyze more precisely, theory become more complex. A sophisticated and practical one is Fenner's [2], [3] non-Newtonian and non-isothermal two-dimensional extrusion theory that takes account of both down channel and cross channel flows. In this chapter, the theory of Fenner and its numerical calculation method are described in detail. [2] Fenner, R.T., Polymer, 16, 293 ('75) [3] Fenner, R.T., 'Principles of Polymer Processing', P.109, Macmillan Press ('79) |