Processing Machinery
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PET bottle body stress cracking
Fenómeno del problema
PET bottles crack at the bottom after being filled with liquid and stored for a period of time
Análisis de la causa
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
Solución
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
Conclusión clave
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
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