Thermoforming
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PET blister meal box
Problem Phenomenon
CPET meal boxes warp and deform after oven use
Cause Analysis
Crystallized CPET meal boxes have good heat resistance, but when crystallinity is improperly controlled, they shrink and warp when heated; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Control CPET crystallinity according to process specifications; add ribs to the meal box structure; verify by actual testing in a 220℃ oven; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
CPET meal boxes rely on dual control of crystallinity and structure; 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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