Material Drying
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PA6 Packaging Film Oxygen Barrier
Problem Phenomenon
The PA6 composite packaging film delaminates after high-temperature retorting
Cause Analysis
During retorting, the PA6 layer absorbs moisture and expands, and its thermal expansion mismatches with the adhesive layer; interfacial stress under humidity and heat causes delamination; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Select retort-grade PA6 film and matching adhesive for retort pouches; control the lamination curing process; verify the lamination strength by a 121°C retort test; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Retort packaging requires matching verification of the entire retort-grade material system; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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