. The miller, millwright and millfurnisher. good material will go overthe tail and into the dust-room, and the middlings that are sifted through thecloth will be imperfectly purified. The underside of the cloth is clogged with dust that comes from the mid-dlings and from the air about the mill. No matter how thoroughly the mid- COLLECTING AND GRADING FLOUR DUST. 413 dlings are dusted or freed from flour, there is enough dust in the air aboutthe mill to clog up the meshes. This might, perhaps, be largely obviated by-drawing the suction of the machine from the air without the mill. The dustcould
. The miller, millwright and millfurnisher. good material will go overthe tail and into the dust-room, and the middlings that are sifted through thecloth will be imperfectly purified. The underside of the cloth is clogged with dust that comes from the mid-dlings and from the air about the mill. No matter how thoroughly the mid- COLLECTING AND GRADING FLOUR DUST. 413 dlings are dusted or freed from flour, there is enough dust in the air aboutthe mill to clog up the meshes. This might, perhaps, be largely obviated by-drawing the suction of the machine from the air without the mill. The dustcould not be entirely overcome by drawing the air from without the mill, be-cause some dust will follow the middlings through the cloth, and this can-not be avoided, because flour dust is being constantly made by the action ofthe middlings upon themselves, that is, they are being constantly reducedby handling. Collecting and Grading Flour Dust.—Fig. 291 shows a mode ofcollecting and grading dust of flour and grain, and also the dust from the. Fig. 291. middlings purifier. There is a balloon or balloons. A, for straining dust fromcurrents of air drawn from a plant of milling machinery. The dust is blowninto the balloons through the cloth-covered sides, the air escaping back intothe mill. There is a hopper bottom to the balloon to receive the strained-offdust, which can be spouted off to where it is desired. Unless the machineson which such a balloon operates have these appliances for creating strongair currents there inay be one or more fan-blowers, K, combined with the bal-loon and connected by air-trunk, N, to the machine, and by another trunk,N, to the balloon. In Fig. 291 the elevator bolting chest B, crushing rollersC, stock-bin E, spout M, to stock-bin millstones F, conveyors G, are all sup-posed to yield substantially the same grade of flour dust, which is returnedfrom the balloon to the conveyors G. The flour dust from the middlingspurifier L is also supposed to be of subst
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectflourmi, bookyear1882
