On predicting roller milling performance - Part I: The breakage equation

G. M. Campbell, P. J. Bunn, C. Webb, S. C W Hook

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    The mathematical relationship (breakage equation) between the inlet and outlet particle-size distributions of a roller milling operation is described, and the breakage function linking the two is defined. The forms of the breakage equation and the breakage function are different for roller milling than for other comminution operations, such as hammer milling or ball milling. The breakage equation is discretised to give a matrix form, from which it is demonstrated that during roller milling of wheat, particles break independently of one another. This is an important assumption of breakage equations for many comminution operations and experimental results are presented, which confirm its applicability to the roller milling of wheat grains. Breakage matrices are successfully used to predict the outlet particle-size distributions from First Break milling of wheat. Later papers in this series consider the form of the breakage function. Copyright © 2001 Elsevier Science B.V.
    Original languageEnglish
    Pages (from-to)234-242
    Number of pages8
    JournalPowder Technology
    Issue number3
    Publication statusPublished - 30 Apr 2001


    • Breakage matrix
    • Flour
    • Particle-size distribution
    • Roller milling
    • Wheat


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