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