Extrusion & Post
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LDPE Film Corona Decay
Problem Phenomenon
After storage for a period of time, the treated film's printing adhesion decreases.
Cause Analysis
The corona treatment effect naturally decays with storage time; slip agent migrating to the surface also reduces surface energy.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Re-test the dyne value before printing and re-treat online when necessary; ②Control the slip agent addition amount; ③Shorten storage time after treatment; ④Standardize storage conditions.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Corona aging is a common-sense problem in film processing; treating right before use or re-treating online is a safe practice.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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