Blow Molding
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PVC vs PP Comparison
Problem Phenomenon
Stress cracking after replacing PP chemical containers with PVC
Cause Analysis
PP's chemical resistance range differs from PVC, and certain solvents attack PVC; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Select material according to medium compatibility; PVC resists acids and alkalis well but fears some organic solvents; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For chemical container material selection, check the medium compatibility table; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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