Pulp and paper magazine of Canada . S0°] \ 1 / \ 40° MEDIUM V\ / —[ \ , , 40* 20° \ 20 \ 40° 60 80 100 120 140 160 180 150 2O0 2S0 300 350 400 450 500 A, 2 3 4 5 HORSEPOWER PER T0N-B0NE DRY HORSEPOWER TO GRINDER TONS IN 24 HOURS-BONE ORT Fig. 2.—Relation of power consumption and rate of production to sharpness of stone, at 17 described. The indications are, however, that stones of fine possible that burrs of certain design will give a greater grit are capable of producing more finely ground pulps, amount of grinding surface than others, and that the pro- and that a stone of extremely coarse gr
Pulp and paper magazine of Canada . S0°] \ 1 / \ 40° MEDIUM V\ / —[ \ , , 40* 20° \ 20 \ 40° 60 80 100 120 140 160 180 150 2O0 2S0 300 350 400 450 500 A, 2 3 4 5 HORSEPOWER PER T0N-B0NE DRY HORSEPOWER TO GRINDER TONS IN 24 HOURS-BONE ORT Fig. 2.—Relation of power consumption and rate of production to sharpness of stone, at 17 described. The indications are, however, that stones of fine possible that burrs of certain design will give a greater grit are capable of producing more finely ground pulps, amount of grinding surface than others, and that the pro- and that a stone of extremely coarse grit may produce very duction will in this way be slightly increased,shivy pulp. Reprinted from a bulletin of the Forest Products Laboratory of the United States Forest Service. August 15, 1913 I* U L P AND PAPER M A G A Z I N E 565 V / / 1 / / / / / / 60 r: L\ . 3a / ./ •J / \ 20 * \ 1 20° / \ ?0° \ / 40° ^ f / j ..- / DULL \ \ / / TONS IN 24 HOUdS-BONE DRY Fig. 3—Relation of powt nption ite of production to sharpr. TONS IN 24 HOJRSn BONE DRY of production (o pr /* i // / / \ / ^ / \ V i \ \ // J X \ \ \ / // // ?m \ v // / ( / \ \ \ // i /} 1 \ \\ // / / EC e 0 U O IS 0 14 0 1E 0 2C 0 2 0 3C 0 35 0 4( 0 4! 0 5( 0 5 0 . 4 . I a —{ 3 TO THE INCH STRAIGHT TO THE INCH SPIRAL CUT BURRS TONS IN 24 HOURS-BONE OUT -8 TO THE INCH DIAMONO POINTBURR- 6 TO THE INCH SPIRAL CUT BURR Fig. 5.—Relation of power consumption and rate of production to pressure at 225 r. p. m. 566 PULP AND PAPER MACAZINK August 15, 1913 Figs. A, B, C, and P. show some ol the hush rolls used insurfacing the stone for runs. The surface obtained by hurl-ing with the rolls shown in Figs. A and B seemed tomore satisfactory results than any other thus far stone was first dressed with a 3-to-the-inch roll, anddepressions were formed from one thirty-second to one-six-teenth of an inch deep. The stone was then rolled with a12-to-the-inch spiral-cut burr until the spiral markings werepl
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaperma, bookyear1903
