Processing Machinery
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PP Stress Cracking
Problem Phenomenon
【Problem Phenomenon】PP cracks after assembly or chemical contact
Cause Analysis
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
Solution
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
Key Takeaway
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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