Molds & Tooling
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High-viscosity melt mold filling difficulty
Problem Phenomenon
PEI melt flow length is short, and thin-wall or complex-structure cavities are underfilled
Cause Analysis
PEI melt intrinsic viscosity is high (MFR usually <10g/10min); barrel temperature set too low, melting and plasticization insufficient; mold temperature too low, the melt front solidifies quickly
Solution
Increase the melt temperature to 380-390°C to reduce melt viscosity; increase the mold temperature to 150-180°C to delay melt solidification; optimize the gate and runner system to reduce pressure loss
Key Takeaway
Within the degradation and safety range, the PEI processing temperature should be increased as much as possible to improve flowability
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