Extrusion & Post
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Bottom bursting of PET stretch-blow bottles
Problembeschreibung
The bottom of PET bottles bursts during inflation or dropping, especially carbonated beverage bottles.
Ursachenanalyse
Improper bottle bottom design (draw ratio too large and over-thinned); molecular chains at the bottom injection point are highly oriented but weakly bonded.
Lösung
Optimize the bottle bottom geometry, increasing the bottom radius and adopting a petaloid bottom; adjust preform bottom heating; control pre-blow and main-blow timing.
Wichtigste Erkenntnis
PET bottle bottom bursting is one of the most dangerous defects.
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