Segregation during bulk transport and handling: free white paper and video
Fines will always be present in pelleted feed, but their degree of acceptance varies by market — e.g., dairy pellets intended for use in robotic feeders should be virtually free of fines, while the integrated poultry industry is more tolerant.
Still, almost everyone would be upset to find that their feed sample contained more than 50% fines. This not only creates physical problems, but there is potential for nutrient segregation and a loss of animal performance.
FREE WHITE PAPER: Segregation during bulk handling
Kansas State University researchers conducted an extensive study to understand where fines are generated in the feed mill. They found that fines increased from 9% off the pellet mill to 14% after the fat coater and then to 20% going into the bulk truck (De Jong, et. al., 2015)
Twenty percent fines is maybe not so bad, but if this is true, why do unhappy sales people keep showing up at the mill office with plastic bags full of feed that is mostly fines?
The white paper ’Segregation during bulk transport’ examines how feed containing 20% fines might look as it moves through the transport system - and shows how fines can quickly increase from 20% to more than 50%!
FREE VIDEO: Segregation in bulk silos
In this video you can see how small particles stay where they land and fill the voids between larger particles while pellets flow easily to the outsides of the silo. When the contents of the bin discharge the column directly above the outlet flows downward and thereafter material from the top of the silo moves downward into this discharging column. These two principals combine to cause segregation of fines during bulk transport creating concentrated pockets that are mostly fines..