Experimental study of the degree of fill and melt densification in fully-intermeshing, co-rotating twin screw extruders

Dilhan M. Kalyon, Cherian Jacob, Piraye Yaras

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37 Scopus citations

Abstract

The degree of fill and the corresponding density development in fully-intermeshing, co-rotating twin screw extruders were experimentally investigated. An APV 50.8 mm clam shell design twin screw extruder was employed under isothermal conditions. A plasticized, transparent thermoplastic elastomer was used to determine the degree of fill and density distributions. In consecutive experiments the kneading disc sections were systematically staggered at various reverse and forward angles. With forward stagger angles the degree of fill in the kneading section was found to be less than one, thus generating a partially full channel. The distribution depended on the degree of the forward staggering. With the reverse and neutral kneading discs the degree of fill was one, i.e. a completely full channel at the kneading disc block. The degree of fill distributions were found to affect the development of the axial density distributions. Decreasing values of density, associated with enhanced air incorporation, were observed with the partially full mixing volume of the kneading discs staggered in the forward configuration. The density distribution followed the pressure profile in the twin screw extruder.

Original languageEnglish
Pages (from-to)193-200
Number of pages8
JournalPlastics, Rubber and Composites Processing and Applications
Volume16
Issue number3
StatePublished - 1991

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