Processing Machinery
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PP Stress Cracking
Problembeschreibung
【Problem Phenomenon】PP cracks after assembly or chemical contact
Ursachenanalyse
PP has good chemical resistance but certain solvents (aromatic hydrocarbons, chlorinated hydrocarbons, concentrated oxidizing acids) attack it; stress state induces cracking; low-temperature embrittlement is also a cause; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Lösung
Check the medium; anneal high-stress parts; select copolymer for low-temperature parts; after adjustment, take continuous samples 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
Wichtigste Erkenntnis
For PP stress cracking check medium and low temperature, annealing and copolymer respond; 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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