Material Drying
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PA6 Poor Coating Adhesion
Problem Phenomenon
After spray coating of PA6 product surfaces, the paint film adhesion is poor, peeling off in the cross-cut test
Cause Analysis
PA6 surface energy is moderate and release agent residue blocks paint film wetting; surface moisture after moisture absorption also affects adhesion, and incomplete pretreatment is the main cause; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Wipe with solvent before spraying to remove release agent and dry to remove moisture; use flame or plasma treatment to raise surface energy; use PA6-specific primer; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Spray coating adhesion is guaranteed by pretreatment, and degreasing, dehumidifying plus surface activation are all indispensable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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