Processing Machinery
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PET material change cleaning temperature
Fenómeno do problema
After PET is changed to other materials, gel particles and black specks persist for a long time
Análise das causas
PET has a high melting point, and the residual material requires high temperature to be discharged, so a low-temperature purging material cannot push out the retained PET; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
For material change, first use purging material at 280℃ to push out the PET; then lower the temperature to switch; disassemble and clean the dead corners; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
High-temperature material change requires purging at the same temperature before lowering the temperature; after confirming effectiveness, solidify 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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