Processing Machinery
1 views
PET bottle body stress cracking
Problem Phenomenon
PET bottles crack at the bottom after being filled with liquid and stored for a period of time
Cause Analysis
Stress concentration in the bottle bottom design plus environmental stress action of the contents; release of residual stress triggers cracking; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Optimize the bottle bottom structure to reduce stress concentration; the blowing process ensures uniform stretch ratio; content compatibility verification; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Stress cracking requires three-party verification of structural design, process, and contents; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
Was this helpful?
0 people found this helpful
Thank you for your feedback!