Molds & Tooling
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PP Semi-Crystalline Management Logic
Problem Phenomenon
[Problem Phenomenon] Managing the PP process with amorphous thinking; crystallinity out of control
Cause Analysis
PP is semi-crystalline: mold temperature determines crystallinity and thus affects strength and shrinkage; cooling rate affects crystallization; manage according to semi-crystalline logic; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Mold temperature serves crystallization; cooling affects crystallization shrinkage; set the process according to semi-crystalline logic; 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 is a semi-crystalline material; mold temperature manages 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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