Processing Machinery
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PA6 Nozzle Solidification Clogging
Fenómeno do problema
After a short stop, the nozzle was clogged and no material came out, making startup difficult.
Análise das causas
PA6 crystallizes quickly and solidifies as soon as the nozzle temperature is slightly low; the nozzle heater band is faulty or heat dissipates quickly in contact with the mold; the high crystallinity of PA6 makes the nozzle a weak point.
Solução
①Check whether the nozzle heater band and thermocouple are normal;②appropriately increase the nozzle temperature;③shorten the mold-open residence time to reduce nozzle cooling;④enlarge the nozzle aperture when necessary;⑤empty the barrel or lower the temperature for heat preservation before stopping.
Conclusão principal
PA6 nozzle clogging = 'fast solidification + weak heating': the nozzle heating system is the lifeline; nylon crystallizes quickly and clogs as soon as it stops, and the heater band status and shutdown management must be in place.
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