Extrusion & Post
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PARA Painting and Coating
Problem Phenomenon
PARA paint adhesion is poor; surface energy and pretreatment, high-fiber surface influence.
Cause Analysis
PARA surface energy; exposed glass fiber influence; pretreatment process; paint system matching.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
①Surface cleaning and treatment; ②Select matching primer; ③Special treatment for high-fiber surfaces; ④Adhesion testing.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PARA painting pretreatment determines adhesion; high-fiber surfaces need special processes; testing verifies quality.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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