Experimental Study on the Modified P-V-T Model to Improve Shrinkage Prediction for Injection-Molded Semi-Crystalline Polymer.

ABSTRACT: Shrinkage of injection-molded parts is a major challenge for dimensional accuracy, especially for semi-crystalline polymers where crystallization induces pronounced volume change and heat release during cooling. Because packing pressure is effective only before gate or local solidification, multi-stage packing is commonly used to regulate the overall shrinkage behavior. In practice, however, the solidification/transition temperature taken from standard material tests does not necessarily represent the actual in-cavity state behavior under specific cooling rate and pressure history, which compromises the consistency of P-V-T-based shrinkage prediction. In this study, a modified P-V-T-based framework (Tait equation) is developed for polypropylene (PP) by introducing a Thermal Enthalpy Transf

SUBMITTER: Chen SC 

PROVIDER: S-EPMC12899455 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature