The melting performance of single screw extruders. II

J.F. Ingen Housz, H.E.H. Meijer

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
177 Downloads (Pure)


In the previous paper (1) the melting performance of a number of recent screw designs was analyzed, using a rather simple theory. A new screw design was proposed. Here the results of more elaborate calculations are given in which the influence of the flight clearance and of a shear-thinning temperature dependent viscosity are investigated. The former conclusions are not altered in essence by these effects. Experimental results with a prototype screw are presented, showing that melting capacity is increased. Up to 100 percent increase in throughput is possible in the high RPM range (in comparison with a much longer traditional compression screw), provided that the feed capacity is sufficient. This usually requires the use of a grooved, well-cooled, feed section; the capacity of such a feed section depends, for a given screw geometry, on channel depth and granule dimensions. The melt leaves the melting section at a relatively low temperature. The melting section only melts the material and does not raise its temperature unnecessarily. A further step towards separating distinct tasks of the extruder by functional screw design has been made.
Original languageEnglish
Pages (from-to)1156-1161
JournalPolymer Engineering and Science
Issue number17
Publication statusPublished - 1981


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