Processing Machinery
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PA66 nozzle temperature setting
Problem Phenomenon
PA66 nozzle drool severe, after lowering temperature frequent cold-material nozzle blockage
Cause Analysis
PA66 melting point high and solidifies fast, nozzle temperature window narrow; temperature too high, melt viscosity low and drools; too low, nozzle tip solidifies and blocks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Nozzle temperature 5-10℃ lower than melt temperature; use self-locking or needle valve nozzle; set suck-back pull 3-5mm; nozzle heater band individually temperature-controlled; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Narrow-window nozzle temperature must coordinate with self-locking structure and suck-back process; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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