Processing Machinery
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PET hot filling deformation
Problem Phenomenon
Hot-fill bottles collapse after being filled with 85℃ juice
Cause Analysis
Ordinary PET bottles have heat resistance temperatures lower than hot filling temperatures; the bottle body softens and shrinks; 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
Hot filling must use heat-set bottles or heat-resistant crystallized bottles; verify the match between filling temperature and bottle type; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hot filling and normal-temperature bottle types cannot be mixed; 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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