Extrusion & Post
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ASA poor coating adhesion
Problem Phenomenon
After ASA products are spray painted, paint peeling occurs, cross-cut test fails, paint film edges peel, and it remains unstable after pretreatment adjustment.
Cause Analysis
The matching of ASA surface polarity with the paint system affects adhesion; mold release agent residue and surface contamination block paint film bonding; surface energy changes with storage time and environment.
Solution
①Clean and degrease before coating and verify mold release agent residue; ②select a primer system matched with ASA; ③control storage environment and time before coating; ④verify coating quality with both cross-cut and weathering tests.
Key Takeaway
ASA can be coated but pretreatment is the key to success; mold release agent residue is the most common invisible killer; primer system matching is more important than topcoat adjustment.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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