Processing Machinery
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PLA Chemical Resistance Boundary
Problem Phenomenon
PLA containers dissolve after contact with concentrated alkali or organic acids, but are unaffected by water and oils
Cause Analysis
PLA is soluble in organic acids, alcohols and concentrated alkali; the ester bonds are especially sensitive to alkali; chemical contact scenarios need verification by medium, and alkaline environments are basically prohibited; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Prohibit PLA in alkaline environments; ②Verify contact with organic acids and alcohols; ③Neutral water-based and oil environments are usable; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The boundary of PLA chemical resistance lies in alkali and organic acids; alkaline environments are vetoed with one vote during medium list review; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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