Miller Magazine Issue: 119 November 2019

80 ARTICLE MILLER / NOVEMBER 2019 urement (PSM) instrument provides an alternative to the classic laboratory sifter (Ziolko, 2018). WHEN SHOULD BREAK RELEASES BE CARRIED OUT? Break releases should be checked whenever a change has occurred in the mill - roll change or sieve change. Small changes such as incorrect wheat moisture, in- consistent conditioning times, softness or hardness, unwell adjusted feed rolls, poorly adjusted roll gap, inef- fective roll brushes, incorrect sieves, damaged or worn sieve cleaners, poorly adjusted air settings on purifiers, incorrect sieves can individually or collectively cause a good mill to produce poor milling results (Bunn, 2000). The break releases are determined on a routine basis and at least once each shift. Because of changes in the composition of the different streams that occur depend- ing on the wheat mix that is processed the break releas- es of each of the break passages should be adjusted by the head miller after mill mix changes (Bunn, 2000; Posner and Hibbs, 2005). When a mill is about to carry out an Ash Curve, then it is imperative that the break releases are checked and set as per a pre-determined protocol. WHAT IS THE OPTIMUM BREAK RELEASES VALUES? Wheat type, wheat moisture, length of milling flow, condition of the grinding rolls and flour quality desired are among of the factors that affect the optimum break release schedule for any milling operation (Fowler, 2012). The ash of produced flour is a good indication of variance from optimum break releases. The break releases adjust- ments of first three breaks (primary break) have an effect on cumulative ash of resulting flours and intermediate stock distribution in mill (Sakhare and Inamdar, 2014). When determining the optimal break release schedule for the mill, proper management for testing and setting the break releases is critical to maintain the correct mill balance and to meet the ultimate objective, maximiz- ing extraction of quality product (Fowler, 2012, Fowler, 2014). For example, in an operating mill, the rolls are adjusted to the following possible break release ranges of mill hav- ing four or five break passaged (Posner and Hibbs, 2005; Sebastian, 2018) REFERENCES Bunn J., 2000, BREAK RELEASES - THEIR IMPOR- TANCE TO THE FLOUR MILLER, 12th AOM Middle East and East Africa Conference and Trade Show. 9 – 11 October, Antalya, Turkey. Campbell G. M., 2007, Roller Milling of Wheat, in: Hand- book of Powder Technology, Volume 12, Elsevier Ltd., Am- sterdam Fowler, M., 2012, Optimizing Break Release, Milling, 20(4):30. Fowler, M., 2014, Adjusting the break system, World Grain 32(4):114. Gwirtz, J., 2002, Break Release Measurement, A Man- agement Issue?, AOM Bulletin April, 7777- 7781. Gwirtz, J., 2018, Measuring break release, World Grain, 36(9):72-76 Miskelly D. and Suter D. A. I., 2010, Processing wheat to optimise product Quality, in: C. W. Wrigley and I. L. Batey, Cereal grains Assessing and managing quality, Woodhead Publishing Limited. Posner E. S. and Hibbs A. N., 2005, Wheat Flour Milling, American Association of Ce- real Chemists, Inc, St. Paul Minnesota. U.S.A. 489p. Sakhare, S. D. and Inamdar, A. A., 2014, The cumulative ash curve: a best tool to evaluate complete mill performance, Journal of Food Science and Technology, 51(4): 795–799. Sebastian, R., 2018, The importance of break system in flour milling process, Miller Magazine 12(105):80. Serna-Saldivar S. O., 2010, Cereal Grains Properties, Processing, and Nutritional Attributes, CRC Press. 747p. Ziolko, T., 2018, Measuring particle sizes and optimizing processes, Miller Magazine, 12(105):76. Passage Break Release (%) Sieve size 4-Break 5-Break 5-Break B1 30-45 25-35 30 20 wire (910 µm) B2 50-55 45-50 40 20 wire (910 µm) B3 55-60 50-55 - 20 wire (910 µm) B3 (Coarse) 30 20 wire (910 µm) B3 (fine) - - 45 24 wire (730 µm) B4 (Coarse) - - 20 24 wire (730 µm) B4 (fine) - - 30 24 wire (730 µm) B5 - - 30 24 wire (730 µm)