COSMIN V. JINESCU, NICOLETA TEODORESCU EXTRUDER PERFORMANCE BASED ON A CORRELATED EXTRUDER HEAD-SCREW-BARREL UNIT WORKING FIELD A number of inventions, and theoretical and experimental research allowed to increase the thermal homogenous melt flow-rate delivered by the screw. On the other hand, quality of the extruded product depends on geometrical considerations of the extrusion head and on a large scale on the rheological behaviour (viscous and elastic) of the polymer melt. Non-harmonizing the design of the screw-barrel unit with the construction of the extrusion head can lead to low-quality products. In this paper, the extrusion head working field was drawn based on limitations imposed by the screw-barrel unit, i.e.: maximum flow-rate assuring required melt thermal homogeneity; - maximum flow-rate for which the heating system on the barrel (and screw, eventually) assures the extrusion temperature; -minimum flow-rate corresponding to screw diameter.
Keywords: extruder head working field, extruder performance, rheological behaviour, screw-barrel unit