Processing Machinery
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PVC Barrel Temperature Zoning
Problem Phenomenon
PVC plasticization uneven, products contain unmelted material and local yellowing
Cause Analysis
Barrel temperature gradient unreasonable, front zone too high degrading while rear zone under-plasticized; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Barrel gradient: rear zone 150℃, middle zone 170℃, front zone 185℃; feed zone cooling to prevent bridging; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVC temperature gradient must be gentle, strictly prevent front zone overheating; 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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