Molds & Tooling
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Multi-gate product low weld line strength
Problembeschreibung
Multi-gate PEI products are extremely prone to fracture at the weld line
Ursachenanalyse
PEI molecular chains are rigid with slow diffusion rate, causing insufficient molecular entanglement at the weld surface; the melt temperature has already decreased when converging
Lösung
Reduce the number of gates (simplify the flow pattern); increase the melt temperature to 380-390°C to extend the fusion time at the weld surface; use sequential valves to control the opening time of each gate
Wichtigste Erkenntnis
The rigid molecular chain characteristics of PEI make weld lines particularly weak areas
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