Extrusion & Post
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PP Printing and Coating
Problem Phenomenon
【Problem Phenomenon】PP products need printing and coating, adhesion is poor
Cause Analysis
PP has low surface energy and is non-polar, so printing and coating adhesion is poor; corona/flame/plasma/primer pretreatment is required; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Surface pretreatment before printing and coating (corona/flame/plasma); primer enhancement; adhesion test; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP printing and coating must first activate the surface, only then can adhesion come up; after confirming effectiveness, fix 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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