Molds & Tooling
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Product continuous post-shrinkage after placement
Fenómeno del problema
The product dimensions continuously and slowly change after demolding, still unstable after 24h
Análisis de la causa
The molecular chains in the amorphous regions of the PP matrix continue to relax and rearrange at room temperature; the post-crystallization process of PP continues to room temperature; slow release of molding residual stress
Solución
Extend cooling time in the mold by more than 30%; anneal the product immediately after demolding (120°C/2h); reduce injection and holding pressure to reduce molecular orientation
Conclusión clave
The impact of post-shrinkage on precision assembly parts cannot be ignored
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