14. In the roller process, the grain is crushed between metal rolls
instead of being ground between stones. It is first screened in order to
separate all foreign matter from it, and then stored in bins. When it is
taken from these receptacles, it is put through another cleaning
process, called _scouring_, or it is thoroughly washed and dried in
order to loosen the dirt that clings to it and to free it entirely from
dust, lint, etc. As soon as it is completely cleansed, it is softened by
heat and moisture and then passed through a set of corrugated rollers,
which are adjustable as are the rubber rollers of a clothes wringer and
which flatten and break the grains. After this first crushing, some of
the bran is sifted out, while the main portion of the grain is put
through another set of rollers and crushed more finely. During the
milling, these processes of crushing the grain and removing the bran are
repeated from six to nine times, each pair of rollers being set somewhat
closer than the pair before, until the grain is pulverized. After the
grain has been thus reduced to a powder, it is passed through bolting
cloth, which acts as a very fine sieve and separates from it any foreign
material that may remain. The result is a very fine, white flour.
15. GRAHAM FLOUR.--Sometimes the entire grain, including the bran, germ,
etc.
Pages:
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225