Processing Machinery
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PET insufficient pressure resistance
Problem Phenomenon
Carbonated bottles deform or leak in pressure tests
Cause Analysis
Insufficient bottle body crystallinity and wall thickness distribution; creep expansion under carbonation internal pressure; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Optimize bottle body wall thickness distribution; increase stretch ratio to improve orientation strength; control the precision of the bottle mouth sealing surface; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Carbonated bottles are designed for wall thickness and orientation according to internal pressure creep; 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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