Molds & Tooling
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PE Blow Molded Container Excessive Shrinkage
Problembeschreibung
HDPE/PE bottles and drums shrink excessively after demolding, with small volume or out-of-tolerance assembly dimensions, and poor fit between the bottle mouth and cap.
Ursachenanalyse
Excessive wall thickness/weight, excessive mold temperature, excessive material temperature, low blowing pressure and short blowing time all cause the product to continue shrinking after demolding; excessive storage environment temperature also amplifies the shrinkage.
Lösung
①Appropriately reduce the material temperature and mold temperature; ②increase the blowing pressure and extend the blowing time to allow the product to fully conform to the mold and shape; ③check the mold volume and shrinkage compensation; ④avoid high-temperature environments for product storage; ⑤select grades with more suitable density/shrinkage if necessary.
Wichtigste Erkenntnis
PE '2079851475616104457 shrinkage = management of 'temperature + blowing energy': do not give the temperature too high, and the blowing must be sufficient, so that the product is shaped in place in the mold; the mold volume must be back-calculated and compensated based on the actual measured shrinkage, and cannot be finalized in one go based on theoretical values.
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