Extrusion & Post
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PA12 Extrusion Wall Thickness Drift
Problem Phenomenon
【Problem phenomenon】The wall thickness of PA12 pipe drifted along the length direction, and the dimensions remained unstable after sizing
Cause Analysis
Unstable feeding, melt pressure fluctuation, and unsynchronized haul-off are the main causes of wall thickness drift; only adjusting the haul-off treats the symptoms but not the root cause, and the extrusion output must be confirmed stable before repairing the wall thickness; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
First stabilize feeding and melt pressure, then adjust wall thickness; haul-off speed correction is performed only after the output is stable; synchronously check vacuum sizing and cooling water flow uniformity; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For wall thickness drift, first stabilize output and then adjust haul-off; with the wrong order, the more you repair, the more it deviates; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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