Processing Machinery
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PMMA Cosmetic Packaging
Problem Phenomenon
Cosmetic bottles crack after contact with contents
Cause Analysis
Some cosmetic ingredients (essential oils, alcohols) induce PMMA stress cracking; 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 literature and should be confirmed first during troubleshooting
Solution
Conduct content compatibility testing before packaging; choose chemically resistant grades; isolate with inner coating; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Cosmetic packaging must undergo compatibility testing; after confirming effectiveness, solidify 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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