Injection Molding
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POM nozzle leakage and drooling
Fenómeno del problema
Drooling and dripping at the nozzle during injection intervals, cold material spots appear near the gate, and product weight fluctuates.
Análisis de la causa
Too high nozzle temperature makes the melt viscosity low and drools; excessive back pressure and nozzle bore wear also aggravate dripping, and cold material entering the cavity forms defects.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Lower the nozzle temperature; ②appropriately reduce back pressure; ③use an anti-drool nozzle or suck-back; ④check nozzle wear and sealing.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Drooling both wastes raw material and introduces cold material defects; temperature, back pressure, and nozzle structure are adjusted coordinately, and an anti-drool structure is recommended for POM.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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