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Chapter 10. Solid Conveying in Extruder |
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[Simulation Analysis for Polymer Processing by PC (6), Japan Plastics, Vol.50, No.4, P.122 (1999)]
Different theoretical treatments shall be applied to solid conveying extruder or solid conveying zone of a plasticationg extruder, from melt conveying zone. Usually solid conveying theories assumes that the plastics pellets move in the screw channel as unified solid plug, and shall consider screw geometry, number of revolution, friction coefficients of the solid plug with barrel surface and screw surface, and pressure gradient. Darnell & Mol first published solid conveying theory of extruder [8]. This theory assumes both of the friction coefficients of the solid plug with barrel and screw are same, and neglects flight width of the screw. Later on, Tadmor et al. presented an improved theory [9]. This chapter describes the above theory by Tadmor et al., and then shows a calculation example using the theory. [8] Darnell, W. H. & Mol, E. A. J., SPE J., 12, 20 (April,'56) [9] Tadmor, Z. & Klein, I., 'Engineering Principles of Plasticating Extrusion', P.55, Van Nostrand Reinhold ('70) |