Granulator knife wedge angle effect on constructional efficiency of the extrusion process
with polyethylene granulating
Polimery 2002, No 3, 196
Constructional efficiency of granulating process was determined by conducting an autothermal extrusion process with thermal granulating of medium density polyethylene (MDPE), using a granulator with knives of different tool wedge angle values (β angle 20—40°). β angle value does not affect polymer mass flow rate (G), total power consumption by the extruder with granulator and cooling device (Qc), total power conveyed by polymer (Qw), specific energy consumption (EJC) and energy efficiency of the extruder with granulator and cooling device (ĸw) (Table 1). Change in (β) value has a slight effect on bulk density (ρN) and natural slip (φ) of granulated product. Decrease in (β) value increases bulk density and reduces (φ).
Keywords: extruder head, granulator, thermal granulating, knife wedge angle, bounded rotational cutting, autothermal extrusion