Molds & Tooling
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Difficult Demolding and Mold Sticking of PEEK
Problem Phenomenon
PEEK products adhere to the cavity or core during ejection, with large demolding force; the product surface is scratched, whitened by ejection, or even cracked by ejection, especially obvious for deep-cavity thin-wall parts.
Cause Analysis
PEEK has high melt temperature and high mold temperature, so the product has long thermal contact time with the mold; insufficient draft angle, poor cavity polishing, and over-packing all increase demolding resistance; crystallization shrinkage clamps the core tightly.
Solution
①Ensure sufficient draft angle and raise the cavity polishing grade; ②Reduce holding pressure and holding time to alleviate over-packing; ③Adjust the front and rear mold temperatures so the product stays on the ejection side; ④Increase the ejection area to distribute the force.
Key Takeaway
PEEK demolding is a friction and clamping force problem under high-temperature working conditions; investment in draft angle and polishing at the mold design stage has the highest return; over-packing is the most common inducement on the process side.
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