Molds & Tooling
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PP Warpage from Uneven Crystallization
Problem Phenomenon
【Problem Phenomenon】PP flat plate frame parts warp and deform, poor assembly
Cause Analysis
PP is semi-crystalline with ordered crystallization, uneven cooling causes crystallinity differences leading to warpage; this is the most prominent defect of PP; uneven wall thickness and uneven mold temperature aggravate it; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Uniform mold temperature ensures consistent crystallization; uniform wall thickness; symmetrical holding pressure; mold flow analysis to predict warpage; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The root of PP warpage is uneven crystallization, dual uniformity of mold temperature and wall thickness; 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 problems in the future
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