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Flender/Flender Gear Units/Bevel-helical gear reducers B3

puried endosperm particles do contain few bran specks and parts of wheat germ. These parts of germ are attened when they pass through pair of smooth rolls because they are tough and naturally pliableunlike the endosperm particles, which are brittle. Thus, when ground, endosperm particles,being brittle, break down into ner particles, whereas bran and germ parts either remainthe same size or slightly increase in size through attening. Therefore, small quantitiesof bran and germ fragments can be easily sifted out on the basis of the size differential. The purity of the mainstream product is protected in this manner by rst eliminating the bran fragments through purication and, subsequently, by avoiding contamination withany remaining bran and germ fragments by sifting and collecting similar material from three or four reduction passages together and directing them to reduction passage that is either referred to as coarse reduction orcollecting passage. There are usually two coarse reduction passages in the reduction system. Each one of these is placed after two or three reduction passages which would feed the brangerm fragments to it. Therefore, in con- ventional ow diagram germ is removed from coarse reduction passage. As we go down from the rst to the last reduction passage, the percentage of our extracted decreases in each of these stages. Generally speaking, the our generated fromthe combined rst four reduction passages is approximately 6% of the total our that isproduced. As each reduction passage extracts white our from the material that is fed toit, the subsequent reduction passages downstream continue to receive less and less mate- rial. In addition to that, the residual material for grinding as it progresses through the reduction system also becomes darker, and it appears to be quite contaminated with nebranny material that cannot be further separated from it. This is because the residual mate-rials on the lower reduction passages are largely devoid of th