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Related Experiment Video

Updated: Jul 23, 2025

A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars
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Thermoelasticity of Injection-Molded Parts.

Janez Turk1,2, Daniel Svenšek1,3

  • 1Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana, Slovenia.

Polymers
|July 14, 2023
PubMed
Summary

This study introduces a thermoelastomechanical method to predict deformation defects in injection-molded parts. Treating the molten core as a rubbery state improves accuracy in predicting sink marks and other defects.

Keywords:
injection molding defectsink markvolumetric shrinkage

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Polymer Science

Background:

  • Injection-molded parts frequently exhibit small-scale deformation defects like sink marks.
  • These defects negatively impact the aesthetic and functional qualities of plastic components.

Purpose of the Study:

  • To develop and validate a thermoelastomechanical approach for accurately predicting deformation in injection-molded plastics.
  • To compare the predictive accuracy of treating the molten core as a liquid versus a rubbery state.

Main Methods:

  • A comprehensive thermoelastomechanical model was developed.
  • The elastic problem was solved iteratively at each time step to calculate part deformation.
  • Two distinct treatments for the molten core (liquid and rubbery states) were investigated.

Main Results:

  • The rubbery state treatment of the molten core demonstrated higher accuracy in predicting deformation.
  • This improved accuracy is attributed to the model's ability to account for localized thermal shrinkage displacement.
  • Results were validated against experimental data from literature and independently molded samples.

Conclusions:

  • The proposed thermoelastomechanical method effectively predicts deformation defects in injection-molded parts.
  • Treating the molten core in a rubbery state is crucial for accurate sink mark prediction.
  • The validated approach offers a reliable tool for improving part quality in injection molding.