Processing Machinery
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PVC Nozzle Temperature
Fenómeno do problema
PVC nozzle repeatedly shows degradation yellow spots
Análise das causas
Nozzle temperature locally too high or structural dead corner retention, PVC degrades first at nozzle; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solução
Nozzle temperature take lower limit and heat uniformly; choose large-bore straight-through nozzle; regular cleaning; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusão principal
PVC nozzle should be straight-through large bore plus temperature lower limit; 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 similar problems later
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