Screw extrusion of thermoplastics: I. General model of the screw extrusion

New approach to a simulation of single and twin screw extruders for thermoplastics processing was suggested. The approach takes into account real boundary geometric conditions and conditions on velocity (a screw is rotated, cylinder is fixed), and also that there exist phase transformations of the processed material and its heat exchange with surfaces of the screw and cylinder limiting the working channel of the extruder.