Output computation in the grooved‐barrel extruder with regard to various conveyance techniques

Abstract

AbstractToday the design of extruder screws for grooved barrel extruders is often still based on the known values of the designing engineers or on empirical methods. For some years theoretical approaches for the design of grooved‐barrel extruders have existed1–5 which are, however, not yet satisfactory in computing the output performance, especially in the pressure gradient dependent range. The article presented here introduces a technique for the computation of the output performance in grooved‐barrel extruders in the transport stiff as well as in the pressure gradient dependent range. This also allows the computation of optional multisection screws with shear and mixing sections. The equations are based on a physical–theoretical model that permits a precise statement about output performance and the relevant material‐, geometry‐, and process‐parameters.