B3-CV15-B rdering data Dimensions in mm Gear unit sizeHigh Bevel-helical gear boxes B3

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

pering time is usually shorter to allow higher percentage of granular materialproduction to meet its required objectives. 3.3 The Milling Process and Principal Milling Equipment Milling of wheat into our essentially involves series of grinding and sifting operations with in-between purication of the granular endosperm particles. Grinding, sifting, andpurication operations are carried out by the rollermill, plansifter, and purier, respec-tively. To have clear understanding of the process, it is important to understand theoperation of each of the three principal types of equipment. These equipment types are manufactured by several equipment-manufacturing companies. Therefore, it is natural to expect some differences in terms of durability, design, operating efciency, and price.However, the basic principle of operation is common for all. They are described in thefollowing section. 3.3.1 Rollermills3.3.1.1 Design rollermill has two sides (Fig. . These sides are separated, with separate drives, prod- uct feeding, and ground product pickup. Both sides may be allowed to grind the sameor different stocks, depending on the quantity of given stock to be ground. Each sideconsists of pair of grinding rolls on horizontal plane. Some of the older models of Table 6 Tempering Requirements of Hard, Soft, and Durum Wheats Hard wheat Soft wheat Durum wheat Milling moisture (%) 1.5.5 1.0.0 1.5.0 Tempering time () 8 4 4 Grain-Milling Operations 2 () () Fig. 1 () Cutaway section of rollermill showing two sides; () series of rollermills. (Courtesy of Bu hler, Inc.) rollermills had rolls placed diagonally. Both pairs of rolls are housed in heavy cast- iron frame. The type of grinding action required by the rolls would determine what typeof surface these grinding rolls should have. For example, the grinding of wheat and subse-quent break stocks requires corrugated rolls that become progressively ner going fromrst break to the last break passage. The grinding of pure endosperm par