INVESTIGATION OF THE THROUGHPUT OF A SINGLE-SCREW EXTRUDER TAKING INTO ACCOUNT PRESSURE VARIATIONS DURING A STEP CHANGE IN SPEED

摘要

Extrusion is used to continuously manufacture endless plastic products such as tubes, profiles etc. An essential aspect during the manufacture of semi-finished products is the products' uniform wall-thickness, whereby the manufacturing costs are decisively influenced. The material output is fundamentally influenced by both changing the operating points and from pressure variations in the extrusion process.On changing the operating point, a steady operating point is to be obtained as rapidly as possible in order to minimise the production of rejects. Moreover, a uniform wall-thickness is to be obtained by means of reducing the pressure variations in the extrusion process.