Processing Machinery
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PET egg box
Problem Phenomenon
PET transparent egg boxes crack brittlely in low-temperature cold storage
Cause Analysis
PET toughness decreases at low temperatures, and thin-walled egg boxes are prone to brittle cracking under compression and impact; 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
For low-temperature applications, select impact-modified PET or switch to PS/PVC; round the rib positions of the egg box; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Low-temperature thin-walled containers must be evaluated for embrittlement risk; 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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