Processing Machinery
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PP Toughening Modification
Problem Phenomenon
[Problem Phenomenon] PP is brittle at low temperature and needs toughening improvement
Cause Analysis
PP is toughened with EPDM/POE elastomers to improve low-temperature impact resistance; used for parts with high low-temperature requirements such as automotive bumpers; toughening sacrifices some rigidity; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Select toughened PP for low-temperature impact parts; POE toughening retains transparency well; select the ratio according to the rigidity-toughness balance; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP toughening uses EPDM/POE; low-temperature impact rises while rigidity gives way a bit; 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 future problems
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