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      Experimental and Theoretical Study on Screw Filling in Starve Fed Single Screw Extruders

      , 1 , *

      International Polymer Processing

      Carl Hanser Verlag

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          Abstract

          An extensive experimental and theoretical study has been performed on screw filling in starve fed/flood fed single screw extruders. The effect of screw speed, flow rate (level of starvation) and die geometry has been investigated. A “screw pulling-out” technique was used in the study. The solid conveying, melting positions, the extent of starvation, and the fully filled regions were observed. It was seen that filling of the screw increases with an increase of the flow rate at a fixed screw speed, and decreases with an increase of the screw speed at a fixed flow rate. The screw filling is strongly dependent on the die geometry and increases with an increase of the resistance of the die. The pressure was also measured, and it was observed that it considerably decreases with starvation. Mechanism of screw filling has been discussed. The simulations and experiments were performed for low density polyethylene (LDPE) and high density polyethylene (HDPE) at various operating conditions, both for starve fed and flood fed extrusion. Fill factor, pressure, temperature and melting profiles have been computed and validated experimentally. All the experimental observations were consistent with the simulations.

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          Most cited references 20

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          Fundamentals of plasticating extrusion. I. A theoretical model for melting

           Zehev Tadmor (1966)
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            Numerical simulation of a single-screw plasticating extruder

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              Melting in plasticating extuders theory and experiments

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                27 May 2018
                : 33
                : 2
                : 171-179
                Affiliations
                1 Institute of Manufacturing Technologies, Faculty of Production Engineering, Warsaw University of Technology, Warsaw, Poland
                Author notes
                [* ] Correspondence address, Mail address: Krzysztof J. Wilczyński, Warsaw University of Technology, Faculty of Production Engineering, Institute of Manufacturing Technologies, 02-524 Warsaw, Narbutta 85, Poland, E-mail: wilczynski_k@ 123456wwp.pl
                Article
                IPP3386
                10.3139/217.3386
                © 2018, Carl Hanser Verlag, Munich
                Page count
                References: 23, Pages: 9
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Regular Contributed Articles

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