Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Assuming that the solid moves in consequence of wall friction and friction of the material, transport equations have been established by means of a force and momentum balance on the volume element. These equations serve as a basis for describing the material feeding. That is, transition of the polymer from the feed hopper, or the feeding device, into the filling region of screws and the transport and compression of the solid polymer, i.e., the movement of the feed towards the plasticating zone, with simultaneous decrease of porosity. Depending on the geometry of the screws and on technological and material parameters, the model gives information on degree of filling, compression, pressure buildup, throughput of solids transport zone, and power consumption. The process model is suited for the design of the solids transport zone.
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