Molds & Tooling
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PP Mold Sticking and Scratching
Problem Phenomenon
【Problem Phenomenon】PP products stick to mold and get scratched, demolding is difficult
Cause Analysis
PP has large shrinkage and strong gripping; excessive holding pressure, insufficient draft, and improper polishing 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
Reduce holding pressure; check draft and polishing; balanced ejection; mold release agent assistance; 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 mold sticking is due to shrinkage gripping, reduce holding pressure and check draft; 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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