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In industrial mills grinding and sifting operations are complementary and their characteristic equipments form a technological passage. Technological flow for turning of wheat into flour comprises two main phases: coarse grinding (grist breakage) and fine grinding (grist reduction). After breakage of wheat seeds and wheat seed parts, intermediate grit products are directed to the reduction phase. In the paper is analyzed the flow (circulation) of grist products in the reduction technological phase in a milling plant with capacity of 4.2 t/h. For this phase, the milling plant is equipped with six technological passages, having six plansifter compartments in which products grinded with smooth cylinders are divided on fractions with particles of different sizes, while extracting flour and bran. Fractions (semolina and dust) are returned to the grinding process. Also, in the paper is presented the particle size distribution comparative results of each fraction obtained at plansifter compartments of one and two reduction roll. Is made a discussion on the size limits between is falling particles of each fraction, as well as their visual appearance (endosperm/shell content, shape and size of particles, the amount of flour extracted). [ABSTRACT FROM AUTHOR]

In the paper are presented the theoretical and experimental researches results regarding the particle size characteristics variation of grist coming from breakage phase of wheat seeds on the milling plant technological flow of 100 t / 24h capacity, along with constructive parameters of grinding rolls. For determining the workflow parameters of grinding rolls the mathematical model is presented. [ABSTRACT FROM AUTHOR]

In the paper it is presented the flow diagram of the wheat breakage phase in a milling plant with the capacity of 4.2 t/h, as well as the experimental results of the granulometric analysis of the grist from the plane sifter compartment of the Second Break. It is presented the particle size distribution of the grist that comes from the grinding rolls, but also the five grist fractions in which it is divided into plane sifter compartment of respective passage. Experimental data obtained for the particle size distributions of grist fractions were tested by computer regression analysis, with known distribution laws: Schuhman, Rosin-Rammler, Gauss and log-normal, determining the values for the equations coefficient and the correlation coefficient R². [ABSTRACT FROM AUTHOR]