Processing Machinery
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PA6 Nozzle Temperature Control
Fenómeno do problema
During production, the nozzle frequently drools; after lowering the nozzle temperature, cold material blockage occurs again
Análise das causas
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
Solução
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
Conclusão principal
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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