Processing Machinery
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PA66 nozzle drool and solidification
Fenómeno do problema
Nozzle dripping or blockage alternates, startup difficult.
Análise das causas
PA66 melting point is high: nozzle temperature slightly low causes solidification and blockage, slightly high causes drool; the temperature control window is narrow and the nozzle is where the contradiction concentrates; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solução
①Precisely control nozzle temperature; ②set a reasonable suck-back action to release stored material pressure; ③check the heater band; ④use a needle valve nozzle if necessary; ⑤shorten residence time to avoid melt stagnation.
Conclusão principal
PA66 nozzle='touchstone of temperature control precision': high melting point puts drool and solidification a hair's breadth apart; precise temperature control + needle valve nozzle is a reliable solution; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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