Molds & Tooling
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PEI Warpage Deformation
Problem Phenomenon
PEI products warp after demolding, flatness is out of tolerance, and deformation directions are inconsistent in areas with uneven mold temperature.
Cause Analysis
Unbalanced PEI cooling system causes shrinkage differences; poor mold temperature uniformity (temperature difference should be ≤10℃); high Tg material freezes stress quickly; wall thickness differences aggravate deformation.
Solution
①Optimize the cooling system to ensure uniform mold temperature with temperature difference ≤10℃; ②balanced water circuit design; ③wall thickness consistency design; ④holding pressure curve optimization.; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The 10℃ mold temperature difference in PEI warpage control is a quantitative standard; uniformity takes priority over absolute temperature; design and process are equally important.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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