Investigation of the melting mechanism within a groove-feed single-screw extruder

摘要

THe melting mechanism of LLDPE in a groove-feed extruder was studied through crash-cooling the machine and examining the solidified polymer on the screw. The solids-conveying angle appeared as high as 70 deg near the end of the grooves, reducing to the helix angle of the flight within the melting zone of the screw. Melting was dependent on the dissipated mechanical energy derived from the high internal friction within the solid bed and solids deformation whilst in the grooved feed section.