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Simulation of crystallization evolution of polyoxymethylene during microinjection molding cycle

DOIResolve DOI: https://doi.org/10.1002/pat.4819
AuthorSearch for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-8181-6233; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
FormatText, Article
Subjectcomputer modeling; crystallization kinetics; microinjection molding; morphology; viscous dissipation
Abstract
A mathematical model coupled with a numerical investigation of the evolving material properties due to thermal and flow effects and in particular the evolution of the crystallinity during the full microinjection molding cycle of poly (oxymethylene) POM is presented using a multi-scale approach. A parametric analysis is performed, including all the steps of the process using an asymmetrical stepped contracting part. The velocity and temperature fields are discussed. A parabolic distribution of the velocity across the part thickness, and a temperature rise in the thin zone toward the wall have been obtained. It is attributed to the viscous energy dissipation during the filling phase, but also to the involved characteristic times for the thermal behavior of the material. Depending on the molding conditions and the locations within the micro-part, different evolution of crystallization rates are obtained leading to at least three to five morphological layers, obtained in the same part configuration of a previously work, allowing a clear understanding of the process-material interaction.
Publication date
PublisherWiley
In
  • Polymers for Advanced Technologies 31, no. 4: 838–852.
LanguageEnglish
Peer reviewedYes
NRC publication
This is a non-NRC publication

"Non-NRC publications" are publications authored by NRC employees prior to their employment by NRC.

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Record identifierc2e27966-6a24-46c6-8735-2527ca6f6d03
Record created2020-07-06
Record modified2020-08-04

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