Molding Process
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PP Melt Temperature 200-280 Window
Problem Phenomenon
[Problem Phenomenon] PP melt temperature too low causes insufficient filling, too high causes degradation and strength loss
Cause Analysis
PP melt temperature 200-280°C: take the upper limit for high-flow grades and thin-wall parts, the lower limit for thick-wall parts; above 280°C oxidative degradation occurs, molecular chains break, strength decreases and color changes
Solution
Normally set at 220-260°C; explore 280°C for thin-wall long-flow parts; lower the temperature upon discoloration and strength loss; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP melt temperature 220-260°C is normal, 280°C is the degradation red line; 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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