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Chapter 8. Plasticating Extruder (Tadmor Model) |
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[Simulation Analysis for Polymer Processing by PC (5), Japan Plastics, Vol.50, No.3, P.90 (1999)]
A plasticating extruder melts and extrudes fluid of plastics, through its three functions, i.e. solid conveying, melting (plasticating) and metering. Among these three functions, plasticating is the most important and complicated process. Tadmor published the plasticating extruder theory [4.] first. This theory assumes the melted fluid as Newtonian, and does not necessarily match with experimental results well, but it becomes the foundation of the next non-Newtonian model and is important. The Newtonian theory was followed by the famous non-Newtonian theory also by Tadmor et al. [5], [6]. This new model conforms to actual data fairly well. The theory was an epoch-making one in the sense of making possible to treat the plasticating process theoretically. In this chapter, Newtonian Tadmor model is presented first, and then non-Newtonian model is described with detail explanation of its simulation program and a calculation example. [4] Tadmor, Z., Polym. Eng. & Sci., 6, 185 ('66) [5] Tadmor, Z. et al., Polym. Eng. & Sci., 7, 198 ('67) [6] Tadmor, Z. & Klein, I., 'Engineering Principles of Plasticating Extrusion', P.133, Van Nostrand Reinhold ('70) |