Molds & Tooling
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Ejection Deformation and Warpage of PEEK
Problem Phenomenon
PEEK products show visible deformation immediately after ejection, or gradually warp within several hours after ejection, with ejection whitening and indentations at the ejector pin positions.
Cause Analysis
When the mold temperature is too low and crystallization is insufficient, product rigidity is inadequate, and the ejection force causes plastic deformation of the product in the high-temperature state; at ejection the product temperature is still high and crystallization is incomplete, and stress redistribution during subsequent cooling aggravates warpage.
Solution
①Raise the mold temperature to ensure full crystallization before ejection; ②Extend cooling time to lower the ejection temperature; ③Increase the number of ejector pins and the ejection area to distribute the ejection force; ④Use DSC to verify whether crystallinity meets the standard.
Key Takeaway
PEEK ejection deformation is strongly correlated with crystallinity; raising the mold temperature is often more effective than extending cooling; the ejection system design must match the special working condition of PEEK high-temperature demolding.
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