Melting in screw extruders

Example 9.6 Melting in Screw Extruders The screw geometry and operating conditions for the LDPE extrusion experiment (Figs. 9.24 and 9.36) were given in Example 9.5. Calculate the SBP, using the Power Law model with temperature-dependent viscosity and linear temperature prohle. 

Solid polymer in the form of pellet or powder dropped into the screw channel from the hopper is compacted into a solid plug due to the screw rotation and the solid plug is forced to rub on the heated barrel surface. The solid plug is plasticated or melted in screw extruders primarily by the mechanical energy provided by the drive motor rather than the thermal energy from the heated barrel. 

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