Injection Molding
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PVA injection cold slug marks
Fenómeno del problema
PVA injection molded product shows cold slug marks near the gate
Análisis de la causa
Nozzle temperature on the low side causes residual material from the previous shot to cool and solidify in the nozzle; cold slug well design insufficient to accommodate the cold slug; injection pressure insufficient
Solución
1) Raise nozzle temperature to 140-200°C; 2) Mold design with a sufficiently large cold slug well; 3) Ensure fresh melt at the nozzle front before each injection; 4) Increase injection pressure to push the cold slug through the gate
Conclusión clave
Cold slug marks are caused by solidified residual material in the nozzle; raising nozzle temperature and cold slug well design are the key
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