Molds & Tooling
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Filling Imbalance of PEEK Multi-Cavity Molds
Problem Phenomenon
The cavities of a PEEK multi-cavity mold are filled to different degrees — some cavities have short shots while others already have flash — and product weight differences are out of tolerance.
Cause Analysis
Geometric imbalance of the runner system makes the filling resistance of each cavity different; PEEK's high viscosity is extremely sensitive to flow resistance differences, and tiny runner size deviations are amplified into obvious filling unevenness.
Solution
①Use a balanced runner layout or a hot runner balancing system; ②Correct runner size deviations; ③Use short shot tests to verify filling consistency of each cavity; ④Use independent valve gate control for each cavity if necessary.
Key Takeaway
PEEK multi-cavity molds must verify balance with short shot tests; the amplification effect of high-viscosity materials on geometric deviations requires higher runner machining precision; valve gates are the high-end solution.
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