Theoretical and Experimental Investigations of the Effect of the Radial Clearance Between Barrel and Screw on the Extruder Flow Rate

Abstract

The influence of the radial screw clearance between barrel and screw on the extruder flow rate has been studied on the single screw, industrial, 90 mm extruder used in everyday practice as the extruder for the outer sami-conductive layer in the production of power cables insulated by XLPE. It was shown on the bases of the experimental results and the theoretical approach being accepted, that the leakage flow parts can not be neglected and that the radial screw clearance is an important parameter that should be permanently controlled in order to prevent and to stop production line rate drop.