Abstract
Resin pellets are plasticated inside the heating cylinder not only by heat transfer from outer heaters but also by shear heating of a rotating screw. This paper introduces, from the viewpoint of heat transfer, the following important phenomena dominating the plasticating process of resins; (1) temperature distribution inside flowing melts at the nozzle and screw channels, (2) heat flux changes at the inner surface of the cylinder, (3) torque axial distributions along the inner surface of the cylinder. The break-up phenomenon of the solid-bed (solid unmelted resin pellets) is also described based on visualization results and correlation with the above-mentioned measurement results.
