Extrusion & Post
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PA12 Pneumatic Tube and Cable Sheath Extrusion
Problem Phenomenon
【Problem phenomenon】PA12 pneumatic tube extrusion had uneven wall thickness and rough surface, and the cable sheath had poor appearance
Cause Analysis
PA12 extrusion is sensitive to melt uniformity and die lip condition; uneven wall thickness mostly stems from die lip clearance and unsynchronized haul-off, and rough surface is related to melt temperature and die lip temperature
Solution
Calibrate the concentricity and clearance uniformity of the die lip; match and lock the haul-off speed with the extrusion output to lock the draw ratio; set the melt temperature according to the 220-260℃ window and measure it actually; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Tube wall thickness relies on die lip concentricity plus haul-off matching; for roughness, first check melt temperature and die lip; 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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