PROPERTIES OF CORN SCREENINGS

Inspection data from 1988 to 1990 validated a previous prediction equa tion for corn particle size distribution and showed the relative distr ibution to be independent of market location, BCFM level, and other gr ade factor data. Samples (62) of corn screenings obtained from country elevators were size-separated in 2164-in. increments, from 4.5164 in. to 16164 in. Smaller particles had lower bulk density, higher particl e density, more mycotoxins, higher protein, and lower starch than larg er particles. About 17% of the material was larger than 12164-in., whi ch means it would not have been classed as broken corn-foreign materia l in the grades. Removal efficiency for commercial cleaners was estima ted, by size increment, as a function of removal efficiency for BCFM. The elevators sending samples provided data on handling,rates, cleanin g parameters, and volume handled. No elevator parameter except screen size influenced the properties or size distribution of screenings.