Molds & Tooling
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PP Delayed Deformation Post-Crystallization
Problem Phenomenon
【Problem Phenomenon】PP products continue to deform during storage after demolding
Cause Analysis
PP post-crystallization: crystallization continues after demolding, dimensional shrinkage changes over time; high temperature environment accelerates it; this is a characteristic of semi-crystalline materials; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Sufficient cooling and shaping; annealing stabilization for high-temperature use parts; consider aging in dimensional measurement; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP post-crystallization causes delayed deformation, sufficient cooling and annealing stabilize; 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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