Injection Molding
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PVA '2079851475616104452 flow marks
Fenómeno del problema
PVA injection molded product surface shows 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, front cools rapidly forming marks
Solución
1) Adopt multi-stage injection speed slow-fast-slow to control front stability; 2) Raise mold temperature to 40-50°C to delay front cooling; 3) Stabilize injection pressure to avoid fluctuation; 4) Enlarge gate area to reduce sudden pressure change at the gate
Conclusión clave
Flow marks are caused by unstable injection front and rapid cooling; multi-stage injection and high mold temperature are the key
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