Extrusion & Post
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HDPE film uneven corona treatment
Problem Phenomenon
Printing adhesion is locally poor, and the dyne value test is inconsistent in the transverse direction.
Cause Analysis
The corona treatment power is uneven or the gap between the electrode and the roller is inconsistent; film thickness fluctuation also causes transverse differences in treatment effect.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Calibrate the uniformity of the electrode gap; ②stabilize the treatment power; ③improve the film thickness uniformity; ④test the dyne value by position.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Corona uniformity affects the quality of printing and lamination; electrode calibration and thickness control are equally important.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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