Processing Machinery
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PPO Low-Temperature Embrittlement
Problem Phenomenon
[Problem Phenomenon] PPO products become more brittle in low-temperature environments, with impact failure
Cause Analysis
PPO has a high glass transition temperature, and toughness decreases at low temperature; notches and stress concentration locations are more fragile at low temperature; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Conduct low-temperature impact verification for low-temperature applications; increase fillets in structural design; toughened grades cover low-temperature scenarios; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO toughness decreases at low temperature; low-temperature parts need both verification and toughening; 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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