Molds & Tooling
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Eccentric wall thickness of PET preforms
Fenómeno del problema
PET preform wall thickness is uneven with obvious eccentricity, thick on one side and thin on the other.
Análisis de la causa
The core and cavity are not concentric (insufficient mold machining precision or assembly deviation); runner design causes uneven melt flow around the core.
Solución
Improve mold machining and assembly precision (concentricity ≤0.02mm); optimize the runner for uniform circumferential distribution; appropriately reduce injection pressure.
Conclusión clave
PET preform eccentricity directly affects bottle blowing quality; mold precision and filling balance are fundamental.
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