Processing Machinery
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PP Impact Copolymer Processing
Problem Phenomenon
[Problem Phenomenon] Mixing processes of impact copolymer PP and homopolymer PP, performance not achieved
Cause Analysis
Impact copolymer PP contains an ethylene rubber phase; fluidity is slightly lower, requiring slightly higher temperature; excellent impact but slightly reduced rigidity; adjust the process by grade; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Take the middle-upper limit of temperature for impact copolymer; follow the grade data sheet; do not mix process cards for homopolymer and copolymer; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP impact copolymer temperature is slightly higher; the rigidity-toughness trade-off follows the grade; 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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