Processing Machinery
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PPO Brittleness and Notch Sensitivity
Problem Phenomenon
[Problem Phenomenon] PPO products crack at notches, breaking from sharp corners in drop tests
Cause Analysis
PPO's rigid molecular chains are sensitive to notches, and sharp corners form stress concentration; when internal stress is superimposed, the notch fails first; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Structural design with rounded transitions to eliminate sharp corners; annealing to reduce residual stress; avoid interference stress concentration in assembly; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO is notch-sensitive; rounding plus annealing is double insurance against cracking; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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