Extrusion & Post
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POM Coating Adhesion
Problem Phenomenon
Extremely poor adhesion after painting POM parts
Cause Analysis
POM has low surface energy and dense crystallinity, making conventional pretreatment difficult to activate; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Select special primer; special surface treatment (sandblasting/primer coating); change material when appearance requirements are high; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM coating is inherently difficult—choose carefully for important appearance parts; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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