Abstract
A computer model for a single-screw plasticating extrusion SSEM developed by Wilczynski (1990, 1996) has been modified to model polyblend extrusion. The model has been applied for description of the nascent morphology of an immiscible binary polyblend (LDPE/PS) compounded in the single screw extruder. The SSEM model describes five zones of the extruder (hopper, solids conveying, delay zone, melting zone, melt conveying) and the die, and simulates an operation of the extruder-die system. Given the material and rheological properties of the polymer; the screw, hopper and die geometry; and the extruder operating conditions (screw speed and barrel temperature profile), the model predicts: flow rate of the polymer, pressure and temperature profiles along the extruder screw channel and in the die, solid bed profile, and power consumption.
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