Material Drying
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PA6 Powder Coating Fluidization
Problem Phenomenon
During PA6 powder fluidized bed coating, fluidization is uneven, and the coating shows pinholes and orange peel
Cause Analysis
After the powder absorbs moisture, its flowability decreases and the fluidization state is unstable; moisture escapes when the coating melts, forming pinholes; unreasonable powder particle size distribution aggravates fluidization fluctuations; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Store powder sealed and dry, and dry it before use; ②control the powder particle size distribution; ③match the preheated workpiece temperature with the dip coating time; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The pinhole problem of PA6 powder coating mostly traces back to powder moisture; dry storage and particle size management are the preconditions of coating quality; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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