Abstract
Short cycle times in the injection molding process due to fast and effective cooling of the molds extend the demands for novel screw concepts starting from double-flighted screws and leading to barrier screws with dispersive and distributive mixing elements. We present different high-performance screw concepts for various applications in the injection molding industry. Besides a comparative view of different screw designs, we focus on modelling the plasticizing process in barrier screws using our recently developed software S3 (Screw Simulation Software) to investigate both the melting and the melt conveying process in more detail. The three-dimensional helix shape of the screw channel consisting of feed, barrier and metering section can be approximated via an unwound screw channel. Melting performance, pressure build-up and temperature distribution can be calculated numerically based on physical models and finite-difference approximation schemes. The axial screw motion during the plasticizing process and the idle time during the injection and holding phase are considered as well. Our simulations show good agreement with experimental studies conducted with various screw sizes and barrier configurations.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Praher, B., Goldmann, M., Steinbichler, G.: Inline melt homogeneity measurement in injection molding. AIP Conf. Proc. 2055(1), 120006 (2019)
Maddock, B.H.: Visual analysis of flow and mixing in extruder screws. SPE J. 15(5), 383–389 (1959)
Rauwendaal, C.: Extruder screws with barrier sections. Polym. Eng. Sci. 26(18), 1245–1253 (1986)
Maillefer, C.: Screw extruder. Swiss Patent 363149 (1959)
Barr, R.A.: Extruder, or extruder-like melting apparatus. US Patent 3698541 (1971)
Dray, R.F., Lawrence, D.L.: Apparatus for extruding plastic material. US Patent 3650652 (1970)
Kim, H.T.: Apparatus for extruding polymeric material. US Patent 3867079 (1972)
Rauwendaal, C.: Polymer Extrusion, 5th edn. Hanser, Munich (2014)
Osswald, T.A., Menges, G.: Material Science of Polymers for Engineers, 3rd edn. Hanser, Munich (2012)
Arrhenius, S.: Über die Dissociationswärme und den Einfluss der Temperatur auf den Dissociationsgrad der Elektrolyte. Z. Phys. Chem. 4(1), 96–116 (1889)
Hayward, A.T.J.: Compressibility equations for liquids: a comparative study. Br. J. Appl. Phys. 18(7), 965–977 (1967)
Tadmor, Z., Gogos, C.G.: Principles of Polymer Processing, 2nd edn. Wiley, Hoboken (2006)
Altmann, D., Praher, B., Steinbichler, G.: Simulation of the melting behavior in an injection molding plasticizing unit as measured by pressure and ultrasound measurement technology. AIP Conf. Proc. 2055(1), 040003 (2019)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer-Verlag GmbH Germany, part of Springer Nature
About this paper
Cite this paper
Köpplmayr, T., Altmann, D., Steinbichler, G. (2020). Barrier Screw Design for High-Performance Plasticizing in Injection Molding. In: Hopmann, C., Dahlmann, R. (eds) Advances in Polymer Processing 2020. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-60809-8_8
Download citation
DOI: https://doi.org/10.1007/978-3-662-60809-8_8
Published:
Publisher Name: Springer Vieweg, Berlin, Heidelberg
Print ISBN: 978-3-662-60808-1
Online ISBN: 978-3-662-60809-8
eBook Packages: EngineeringEngineering (R0)