Liu, J., Zhao, B., Kontziampasis, D. orcid.org/0000-0002-6787-8892 et al. (2 more authors) (2024) A novel method for determining the pressure dependent characteristics of polymer melt during micro injection molding. Polymer Testing, 137. 108520. ISSN 0142-9418
Abstract
Micro injection molding is used to manufacture thin-walled parts with micron-scale structures. wherein high shear rate and high injection pressure process conditions appear. Consequently, the pressure dependence of polymer melt viscosity at the microscale cannot be ignored. However, in the simulation analysis of the microinjection molding process, almost all the Cross-WLF models of polymeric materials are omitting the pressure dependence parameter D3. This has a huge impact on the accuracy of the simulation results. Herein, a method that combines experimental characterization and filling simulation is proposed for the determination of the pressure dependence of polymer melts during micro injection molding. D3 in the Cross-WLF model of Polymethyl methacrylate (PMMA) and Cycloolefin copolymer (COC) is characterized by capillary rheometer and counter pressure chamber. The developed viscosity model including D3 is used for a filling simulation and is compared with the experimental results. The model flow simulation results showcases that the prediction accuracy of the viscosity model is significantly improved after considering D3. These results are of great significance, as they can be used to reduce the development cost and to improve the simulation accuracy of the micro injection molding filling process.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Micro injection molding; Simulation; Cross-WLF model; Polymer |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > SWJTU Joint School (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Dec 2024 16:24 |
Last Modified: | 04 Dec 2024 16:24 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.polymertesting.2024.108520 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:220393 |