Extrusion & Post
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Poor adhesion of BOPP film
Problem Phenomenon
The printed or coated layer does not adhere firmly, falls off after rubbing, and the lamination strength is insufficient.
Cause Analysis
The film surface energy is insufficient, corona treatment is not in place, or contaminants on the surface hinder coating wetting and adhesion.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Ensure the corona treatment effect meets the standard; ②clean the surface to remove contaminants before coating/printing; ③test the dyne value before release; ④control slip agent migration.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Adhesion problems are solved from both surface treatment and cleanliness; dyne value testing is the quantitative basis for release.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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