Processing Machinery
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PA6 Nozzle Solidification Clogging
Problem Phenomenon
After a short stop, the nozzle was clogged and no material came out, making startup difficult.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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