Molds & Tooling
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Multi-gate product low weld line strength
Problem Phenomenon
Multi-gate PEI products are extremely prone to fracture at the weld line
Cause Analysis
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
Solution
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
Key Takeaway
The rigid molecular chain characteristics of PEI make weld lines particularly weak areas
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