SCREW EXTRUDER WITH VARIOUS DISPERSIVE MIXING ELEMENTS

摘要

A screw extruder, including a barrel having a bore which defines an inner surface. At least one extruder screw (28) is positioned within the bore, eac h screw (28) further including a central shaft (34) and at least one screw flight (30). Each screw flight (30) further includes a front pushing face (3 6) and a rear face (38). The profile (40) of each front pushing face (36) acts with the inner surface of the barrel to form a progressively narrowing passa ge through which material is forced into multiple regions of high elongational and shear stress which act to break down agglomerates of material and thus dispersively mix the material.