Molds & Tooling
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PP Mold Temperature and Crystallization
Problem Phenomenon
[Problem Phenomenon] PP mold temperature too low causes insufficient crystallization and poor surface, too high lengthens the cycle
Cause Analysis
PP mold temperature 20-80°C: high mold temperature promotes crystallization, improving strength, rigidity, and surface, but extends the cycle; for semi-crystalline materials, mold temperature directly affects crystallinity and shrinkage
Solution
Mold temperature 30-60°C for structural parts to preserve the cycle; take 60-80°C for appearance and high-strength parts; uniform cavity temperature difference; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP mold temperature 30-60°C is normal; take the upper limit for crystallization strength; 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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