How is the ultrafine powder content kept below 2%? What are the principles behind the internal screen and centrifugal force?

By utilizing a precision screen combined with centrifugal force generated by high-speed rotation, only particles meeting the specified size criteria are allowed to pass through and are forcibly discharged. This physical screening mechanism—where particles exit immediately upon reaching the target size—ensures that the content of ultrafine powder smaller than 4μm remains stably below 2%.