ABSTRACT
The purpose of the milling process is to separate bran and germ from the endosperm, and the endosperm is then delivered as flour from the mill. Moreover, the yield should be as high as possible; all the endosperm should ideally be in the flour, and the bran and germ fractions should be free of contamination by endosperm cells or particles. In the milling processes, however, the aleurone layer travels with the bran, and thus the flour yield is less than the highest theoretical value. The particle size distribution differs between hard and soft varieties in that a soft variety contains many more small particles. Flour particles collected above the second set of break rolls show a few large chunks in the case of a hard endosperm whereas a soft endosperm shows much greater disruption. The toughness and lightness of the bran compared to that of the endosperm makes the milling procedure possible.
