Extrusion & Post
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LDPE Film Roll End Face Taper
Problem Phenomenon
The roll is thick at one end and thin at the other, showing a taper, and unwinding runs off track.
Cause Analysis
Transverse thickness deviation of the film accumulates during winding; poor winding centering also amplifies the taper tendency.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Improve film thickness uniformity; ②Calibrate winding centering; ③Adopt EPC correction; ④Control winding tension taper.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Tapered rolls are the cumulative manifestation of thickness deviation; the fundamental cure is improving transverse uniformity.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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