Extrusion & Post
4 مشاهدة
Bottom bursting of PET stretch-blow bottles
ظاهرة المشكلة
The bottom of PET bottles bursts during inflation or dropping, especially carbonated beverage bottles.
تحليل الأسباب
Improper bottle bottom design (draw ratio too large and over-thinned); molecular chains at the bottom injection point are highly oriented but weakly bonded.
الحل
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.
الخلاصة الأساسية
PET bottle bottom bursting is one of the most dangerous defects.
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