Molds & Tooling
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PP Mold Sticking
Problem Phenomenon
Parts stick to the cavity or grip the core tightly, getting scratched during demolding.
Cause Analysis
Excessive holding pressure, high melt and mold temperature, insufficient draft angle, roughened cavity; PP's shrink-and-grip-core characteristic aggravates sticking.
Solution
①Reduce holding pressure and melt temperature; ②increase draft angle; ③polish the cavity along the demolding direction; ④optimize ejection balance.
Key Takeaway
For mold sticking, reduce pressure first, then fix draft and polishing.
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