Material Drying
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PPS Nozzle Drooling
Fenómeno del problema
Nozzle drooling and stringing contaminate the mold surface, and melt drips in the mold-opening gap forming impurity specks
Análisis de la causa
PPS melt has low viscosity and drools easily; countermeasures include anti-drool nozzles (reverse taper type), sufficient drying to eliminate surface water, and fine-tuning of nozzle temperature; the combination of all three works best
Solución
①Select a reverse-taper anti-drool nozzle; ②Fully dry the pellets; ③Moderately lower the nozzle temperature; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
For PPS drooling treatment, nozzle structure takes priority; drying and temperature fine-tuning are supporting measures; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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