Molds & Tooling
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PA6 Nozzle Drooling
Problem Phenomenon
The nozzle dripped material while waiting with the mold open, and cold material or stringing appeared at the gate of the next shot.
Cause Analysis
PA6 melt has low viscosity and easily drools; high nozzle temperature, large back pressure, and no suck-back; low viscosity is the material root of drooling, and nozzle temperature is the direct inducement; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Appropriately lower the nozzle temperature to prevent the melt from flowing out by itself;②set suck-back;③replace with a spring-type or needle-valve nozzle;④shorten the waiting time after material storage;⑤check whether the nozzle heater band and thermocouple are normal.
Key Takeaway
PA6 drooling = 'low viscosity + nozzle temperature + suck-back': nylon material is thin, and nozzle temperature and suck-back are key; the needle valve nozzle is the hardware solution to eradicate drooling; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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