Techniques to analyse particle size of food powders

Abstract : This chapter presents methods for particle size measurements for a better understanding of the physical properties of food powders. Standard methods of defining the size and shape of irregular particles are described together with ways of handling particle size data. Practical aspects of measuring particle size distributions are covered including how powders should be sampled for particle size analysis. The many techniques available for particle size analysis are described by grouping in three types: (1) direct methods, (2) methods based on classification, (3) methods based on secondary measurements. Finally the advantages of in-line continuous measurements for process investigation are described.