Injection Molding
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PEI Flash
Fenómeno del problema
Flash appears on the parting line of PEI products; high-pressure injection and insufficient clamping force act together, making deflashing difficult.
Análisis de la causa
PEI injection pressure is relatively high at 80~120MPa; when clamping force is insufficient, the melt squeezes into the parting line; clamping force needs to be calculated at ≥50MPa per projected area; mold wear widens the gap.
Solución
①Calculate clamping force at ≥50MPa per projected area; machines of ≥500 tons are recommended, calculated by area; ②grind and fit the parting line; ③optimize injection pressure not to exceed the necessary value; ④regularly check mold wear.
Conclusión clave
The clamping force calculation for PEI high-pressure processes cannot be omitted; 50MPa specific pressure is a clear standard; mold maintenance prevents gap widening.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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