Extrusion & Post
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LDPE Corona Decay
Problem Phenomenon
Adhesion is still poor after corona treatment before LDPE film printing
Cause Analysis
The corona treatment value decays over time, and the surface energy falls back after storage; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Re-measure the dyne value before printing; print as soon as possible after treatment; re-corona when necessary; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate the effective measure
Key Takeaway
Corona effect is managed by aging; after confirming effectiveness, solidify 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 in the future
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