Extrusion & Post
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EVA film printing adhesion
Problem Phenomenon
Insufficient printing adhesion.
Cause Analysis
The match between EVA surface polarity and ink needs verification; improper surface treatment affects adhesion.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Corona treatment to increase surface energy; ②select matching ink; ③test the dyne value before printing; ④conduct adhesion tests.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Pre-treatment before EVA printing is indispensable; the dyne value is the release basis.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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