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Journal of Polymer Engineering

Editor-in-Chief: Grizzuti, Nino


IMPACT FACTOR 2017: 0.778

CiteScore 2017: 0.77

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Source Normalized Impact per Paper (SNIP) 2017: 0.551

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2191-0340
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Volume 33, Issue 2

Issues

Comparison of injection molding processability of polylactic acid and high density polyethylene via computational approach

Lee Tin Sin
  • Corresponding author
  • Faculty of Engineering and Science, Department of Chemical Engineering, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, 53300 Setapak, Kuala Lumpur, Malaysia
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  • Other articles by this author:
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/ Yi-Ru Ng
  • Faculty of Engineering and Science, Department of Chemical Engineering, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, 53300 Setapak, Kuala Lumpur, Malaysia
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/ Soo-Tueen Bee
  • Faculty of Engineering and Science, Department of Chemical Engineering, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, 53300 Setapak, Kuala Lumpur, Malaysia
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/ Tiam-Ting Tee
  • Faculty of Engineering and Science, Department of Chemical Engineering, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, 53300 Setapak, Kuala Lumpur, Malaysia
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/ A. R. Rahmat
  • Department of Polymer Engineering, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
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/ Chi Ma
  • Research Institute of Polymer Materials, Shenyang University of Chemical Technology, Shenyang, 110142 China
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Published Online: 2013-02-12 | DOI: https://doi.org/10.1515/polyeng-2012-0114

Abstract

The purpose of this paper is to compare the injection molding processability of polylactic acid (PLA) and high density polyethylene (HDPE) via a computational method. This study was conducted using injection molding simulation software Moldflow® using an iPhone 4 case (I4C) to evaluate the filling and packing stages of PLA and HDPE. The fill time, velocity/pressure switch over (VPSO), frozen layer fraction, time to freeze, volumetric shrinkages and clamp force were analyzed. The results showed that PLA requires a slightly longer time to fill the cavity compared to HDPE. At the mean time, the VPSO of PLA was larger than HDPE, as a result of the higher viscosity characteristic of PLA. From the packing analysis, it was found that the extent of shrinkage for PLA and HDPE was 4.11% and 4.78%, respectively. This result shows that an I4C produced by either PLA or HDPE have very close dimensions. In other words, the redesign of mold to fulfill the different shrinkage extent for PLA and HDPE is unnecessary, which indicates a cost of production saving. Finally, the manufacturing of PLA required a higher tonnage injection molding machine compared to HDPE where the clamp tonnage of PLA is 2.5 times higher than HDPE.

Keywords: computer aided design; injection molding; polylactic acid; polyethylene; processability

About the article

Corresponding author: Lee Tin Sin, Faculty of Engineering and Science, Department of Chemical Engineering, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, 53300 Setapak, Kuala Lumpur, Malaysia


Received: 2012-09-10

Accepted: 2013-01-03

Published Online: 2013-02-12

Published in Print: 2013-04-01


Citation Information: Journal of Polymer Engineering, Volume 33, Issue 2, Pages 121–132, ISSN (Online) 2191-0340, ISSN (Print) 0334-6447, DOI: https://doi.org/10.1515/polyeng-2012-0114.

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