Scientific American Supplement, No. 303, October 22, 1881Various
Science
Scientific American Supplement, No. 303, October 22, 1881
Various
Science -- Periodicals
The break reels are clothed as follows: First break No. 20, wire cloth,
second break No. 22, third break No. 24, and fourth break No. 24. The
material passing through these scalping reels, now called chop, goes to
a series of reels, the first clothed with Nos. 6, 4, and 0. The material
passing over the tail is sent to the germ purifier, that passing through
Nos. 4 and 0, to the coarse middlings purifier, and that through the No.
6 goes to the reel below clothed with Nos. 12 and 13. Some nice granular
flour is taken off from this reel; the remainder, which passes over the
tail and through the cutoffs, goes to the next reel below clothed with
Nos. 14, 15, and 9. Some good flour comes from the 14 and 15; that which
passes through the 9 goes at once to the stones without purifying, while
that which passes over the tail is sent to the fine middlings purifiers.
After the purification, the middlings are ground on stones and bolted
on Nos. 13 and 14 cloth, after having been scalped on No 8. The germ
middlings are crushed on smooth rolls and bolted on Nos. 12 and 13. What
is not crushed fine enough goes with poor tailings to the second germ
rolls, and from these to a reel by themselves or to the fifth reduction
or bran reel. A mill of this kind could be made much more perfect by an
expenditure of two or three thousands dollars more. I have instanced it
to show what can be done with gradual reduction in a very small way.
In mills of from three hundred to five hundred barrels capacity and
still larger, the programme differs considerably from that I have
sketched, the middlings being graded and handled with little, if any,
returning, and are sized down on the smooth rolls, a much larger
percentage of the work of flouring being done on millstones. For a three
hundred barrel roller mill, the following plant is requisite: five
double corrugated roller mills, five double smooth roller mills, three
pairs of four foot burrs sixteen purifiers, four wire scalping reels,
six feet long, one reel for the fifth break, one reel for low grade
flour, eight chop reels, seven reels for flour from smooth rolls, three
reels for the stone flour, two grading reels, three flour packers, and
necessary cleaning machinery. The reels are eighteen feet thirty-two
inches. The programme is necessarily more complicated.
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