Processing Machinery
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PA6 Nozzle Temperature Control
Problem Phenomenon
During production, the nozzle frequently drools; after lowering the nozzle temperature, cold material blockage occurs again
Cause Analysis
When the nozzle temperature is higher than the melt temperature, the melt viscosity is low and drooling occurs; when too low, the material at the nozzle outlet solidifies forming cold material; both situations are improper matching of nozzle temperature and melt temperature
Solution
Set the nozzle temperature consistent with the melt temperature or slightly lower by 5-10°C, combined with an anti-drool nozzle or screw decompression suck-back; drooling and blockage cannot be solved by temperature adjustment alone, and structural anti-drooling is more reliable
Key Takeaway
Nozzle temperature must be set in coordination with the melt temperature, and only combined with suck-back can both drooling and blockage be addressed; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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