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Title: Analysis of process parameters related to the single-screw extrusion of recycled polypropylene blends by using design of experiments
Authors: Fu, Tingrui
Haworth, Barry
Mascia, Leno
Keywords: Single-screw extrusion
Process dynamics
Recycled polypropylene (PP)
Design of experiments
Issue Date: 2017
Publisher: © The authors. Published by SAGE
Citation: FU, T., HAWORTH, B. and MASCIA, L., 2017. Analysis of process parameters related to the single-screw extrusion of recycled polypropylene blends by using design of experiments. Journal of Plastic Film and Sheeting, 33(2), pp. 168-190.
Abstract: © SAGE Publications.The process dynamics of single-screw extrusion on mixtures of polypropylene (PP) and recycled PP were studied using a statistical, design of experiments (DoE) approach. For a conventional screw design, the barrel temperature, screw speed and two vastly different melt viscosity polypropylene mixtures were selected as the independent factors, whilst melt pressure, mass output, screw torque and temperature rise at the die due to shear heating were the dependent responses. A central composite design (CCD) in the framework of response surface methodology (RSM) was constructed, and an analysis of variance (ANOVA) was carried out to determine the significance of the response surface models. The resulting statistical and response surface predictions have demonstrated that the low viscosity component concentration in the blend is a dominating factor on melt pressure and screw torque, apart from the expected effect of screw speed on output. Viscous heating is affected only by screw speed and recycled polypropylene concentration. Furthermore, the predictions have identified a wider process operating window with increased low-viscosity component concentration. The data confirm that statistical tools make quantitative predictions for the effects of experimental process variables, in accordance with the expected qualitative trends towards process optimisation, providing scope towards its application in scaled-up industrial processes.
Description: This paper was accepted for publication in the journal Journal of Plastic Film and Sheeting and the definitive published version is available at http://dx.doi.org/10.1177/8756087916649006
Version: Accepted for publication
DOI: 10.1177/8756087916649006
URI: https://dspace.lboro.ac.uk/2134/25846
Publisher Link: http://dx.doi.org/10.1177/8756087916649006
ISSN: 8756-0879
Appears in Collections:Published Articles (Materials)

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