H4-KV7-B it can be designed according to the equiva lent po Helical gear reducer H4

Flender/Flender Gear Units/Helical gear reducer H4

ional approach. As an example, there may be three different qualities of semolina produced from no. 2 and no. 3 grades of durum wheat in the absence of no. 1 grade of durum wheat ina poor crop year. Table 1 shows how three varying qualities of semolina are producedfrom these two wheats and their targeted extraction rates. The blending of semolina instead of various grades of durum wheat obviously means greater control and exibility in terms of corresponding desired quality of multitude of products, ranging from the high-quality end to economy pasta products. For example, 8%of no. 1 semolina may be blended with 2% of no. 3 semolina for the production ofpremium pasta products, such as, rotini, rigatoni, or other. For the production of short and nonsensitive shapes where starch release is not critical, such as tubetti and elbows, 1%of no. 3 semolina may be used. ACKNOWLEDGMENTS Most of the cleaning, tempering, and milling equipment and process diagrams included in this chapter have been provided by Bu hler, Inc., Uzwil, Switzerland. Kind permission from Bu hler, Inc. for their use is greatly appreciated. The support extended by the follow- Grain-Milling Operations 3 ing organizations in providing equipment diagrams and descriptions is also greatly ap- preciated: Carter Day Industries (Canada) Ltd., North American Millers Association, AIC,Canada, and the Canadian Grain Commission. REFERENCES 1. Dexter JE, Sarkar AK. Roller milling operation, Flour. Encyclopedia of Food Sciences, Food Technology and Nutrition. Academic Press, New York, 1. 2. Hatcher DW, Kruger JE. Distribution of polyphenol oxidase in our millstreams of Canadian common wheat classes milled to three extraction rates. Cereal Chem 1; 7 (5. 3. Sarkar . Flour milling. In: Grains and OilseedsHandling, Marketing and Processing. Vol. 2, 4th ed. Canadian International Grains Institute, Winnipeg, MB, 1. 4. Sarkar . Optimizing wheat mixes for end-use. Assoc Oper Millers Bull. Jan, 1, AOM, Leawood, Kansas. 5. Sar