Injection Molding
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PP MFI and Processing Matching
Problem Phenomenon
[Problem Phenomenon] Improper PP MFI selection causes thin-wall underfilling or insufficient strength
Cause Analysis
2079851475616104452 PP MFI 1-60 (230°C/2.16kg): low MFI (1-12) high strength low flow for structural parts, high MFI (20-60) for thin-wall containers; ultra-thin-wall high-speed can reach 60-100
Solution
Select MFI according to wall thickness and strength; high MFI for thin walls, low MFI for structural parts; balance strength and flow; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP MFI is selected by wall thickness and strength; high MFI for thin walls, low MFI for structure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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