Molds & Tooling
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PP Cooling Time Setting
Problem Phenomenon
[Problem Phenomenon] Improper PP cooling causes demolding deformation or an overly long cycle
Cause Analysis
PP crystallization releases heat and needs sufficient cooling; insufficient cooling causes post-crystallization shrinkage deformation, excessive cooling wastes cycle time; uniform mold temperature shortens cooling; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Verify demolding rigidity by wall thickness for cooling; uniform mold temperature; do not sacrifice quality to compress the cycle; 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 cooling is calculated by wall thickness; post-crystallization deformation must be prevented; 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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