Possible causes of sieving problems numerous.(Powder Coating)

We are having problems controlling our rotary sieve. We empty the waste bag two or three times a day, and there's a lot of scrap powder. We use a 100 mesh screen because we want to be sure there's no dirt in the reclaimed powder. Is this the right screen size? Is there some other feature of the screen that can be adjusted to avoid so much lost powder?

Whenever I hear this, what pops into my mind is that nobody likes to throw away powder, and what changed to cause the situation? If you don't know why you are using 100 mesh, then test a 60 or 80 mesh to see if it meets quality requirements and allows increased flow. Also, be sure to understand the type of contamination …