Processing Machinery
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PVC Nozzle Temperature
Problem Phenomenon
PVC nozzle repeatedly shows degradation yellow spots
Cause Analysis
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.
Solution
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
Key Takeaway
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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