Establishment of the Shear Stresses Acting on the Solid Bed Surrounded by Flowing Melt

Abstract

On single-screw extruders, a solid bed break-up can produce a pulsating melt output and poor melt homogeneity on account of isolated, non-melted particles wandering around in the melt. The break-up of the bed is caused by excessive forces acting on the compacted solid bed. To calculate these forces, it is necessary to have knowledge, not only of the pressure distribution around the compacted solid, but also of the shear stresses acting on the solid bed. This article presents a means of calculating these shear stresses.

Flexible Use of Single‐Screw Extruders through Multiple‐Process Optimization

“…Apart from the REX simulation software, the software concept is also based on the program developed in ref 4–6. for the evolutionary optimization of single‐screw extruders.…”