Injection Molding
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EVOH '2079851475616104452 Flow Marks
Fenómeno del problema
EVOH injection molded product surfaces show radial flow marks centered on the gate
Análisis de la causa
Injection speed too fast causing unstable melt front; mold temperature too low <30°C, the front cools rapidly forming marks
Solución
1) Use multi-stage injection speed slow-fast-slow to control front stability; 2) Increase mold temperature to 40-50°C to delay front cooling; 3) Stabilize injection pressure to avoid fluctuations; 4) Increase gate area to reduce sudden pressure changes at the gate
Conclusión clave
Flow marks are caused by unstable injection front and rapid cooling; multi-stage injection and high mold temperature are key
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