Cereal Chem 57:295 - 300.  |  VIEW ARTICLE
Dual-Purpose Mill for Flour and Granular Products.

W. C. Shuey, R. D. Maneval, and J. W. Dick. Copyright 1980 by the American Association of Cereal Chemists, Inc. 

A 55 cwt pilot mill originally designed and flowed to produce bread wheat flour was modified to increase the purifier surface by 300%. After modification, the mill could produce either a granular or a fine flour product, depending on the mode of operation. Conversion from one mode to the other required about 2 hr and involved changing some of the gaps between rolls, sieve sizes, and stream flows. Roll types or corrugations were not changed. Total flour extraction ranged from 72 to 80%, depending on the wheat lot. Farina of 30-35% extraction was produced when the mill was converted to produce a granular product with a total extraction of 75-78%. The average particle size distribution of the product was 4.3, 43.3, and 44.1% over No. 20 W, 30 W, and 40 W, respectively, and 8.3% through No. 40 W. The percent extraction of semolina from 10 different varieties ranged from 56.3 to 65.4%, with an average extraction of 60.0%. The average granulation of the semolina was 3.1, 72.7, 16.8, and 4.8% over No. 40 W, 60 W, 80 W, and 100 W, respectively, and 2.6% through No. 100 W. The ash content of the semolina ranged from 0.498 to 0.614%, with an average of 0.553%.