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The Relationship of Particle Size to Performance
Jun 11, 2018

The fluidization properties of a powder-coating formulation influence the application and coating results. When introducing pigment to the composition, the degree of fluidizing may change depending on the flow characteristics of the pigment. Larger-particle-size effect pigments typically are not agglomerated and move easily when swirled in a container. This is a good indication of how the pigment will influence the overall fluidization and transfer of the powder through the hopper and the delivery system. Effect pigments with larger particle sizes typically work better in corona applications.

Smaller or micro-size pigments are naturally clumpy in the bulk powder and the platelets appear "stacked" when viewed microscopically. This leads to reduced fluidization and powder transfer efficiency through the delivery system. Poor fluidity of the powder coating leads to surging of powder through the gun, which results in uneven coating as local clumps of powder are integrated over the panel. Over-fluidizing, conversely, causes the finer-particle-size material to separate from the bulk powder and be evacuated through the breather tube, changing the final appearance of the part.

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