Extrusion & Post
2 views
Bottom bursting of PET stretch-blow bottles
Problem Phenomenon
The bottom of PET bottles bursts during inflation or dropping, especially carbonated beverage bottles.
Cause Analysis
Improper bottle bottom design (draw ratio too large and over-thinned); molecular chains at the bottom injection point are highly oriented but weakly bonded.
Solution
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.
Key Takeaway
PET bottle bottom bursting is one of the most dangerous defects.
Was this helpful?
0 people found this helpful
Thank you for your feedback!