Blow Molding
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PVC vs PP Comparison
Fenómeno del problema
Stress cracking after replacing PP chemical containers with PVC
Análisis de la causa
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
Solución
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
Conclusión clave
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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