Molds & Tooling
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Insufficient Runner and Gate Dimensions for PEEK
Problem Phenomenon
[Problem Phenomenon] PEEK has large flow resistance and is difficult to fill, with pressure loss concentrated in the runner and gate
Cause Analysis
PEEK's high viscosity requires medium runners and large gates: Victrex 150G recommends runner/nozzle diameter >3mm, sub-runner >3.5mm, gate >1mm or 0.5 times the wall thickness; too-small dimensions cause large pressure loss and shear degradation
Solution
Enlarge runner and gate dimensions according to the data sheet lower limits; enlarge further for high-viscosity grades; when a too-small gate causes shear problems, prioritize enlarging the gate rather than raising temperature; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Runner >3mm and gate >1mm for PEEK are the official lower limits — when pressure loss is large, measure the dimensions first; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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