Extrusion & Post
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PVC Extrusion Melt Pressure
Problem Phenomenon
PVC extrusion pressure fluctuation causes pipe wall thickness uneven
Cause Analysis
Melt pressure fluctuation makes output unstable, wall thickness fluctuates accordingly; 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
Melt pressure closed-loop control; screen pack pressure differential monitoring; stable feeding; 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
Extrusion stability relies on melt pressure closed-loop management; 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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