Molds & Tooling
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Insufficient Runner and Gate Dimensions for PEEK
Fenómeno do problema
[Problem Phenomenon] PEEK has large flow resistance and is difficult to fill, with pressure loss concentrated in the runner and gate
Análise das causas
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
Solução
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
Conclusão principal
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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