Pulp and paper magazine of Canada . the first two hours after dressing was 3 tons ofbone-dry pulp in 24 hours, and the power consumption perton 112 horsepower. After tons of pulp had beenmade and the stone had become dull the production fell tons in 24 hours, and the power consumption increasedto horsepower per ton for the same grinding condi-tions. poor, consisting of very fine fiber intermixed with coarserparticles. When a very sharp surface is used, the woodfibers are literally ground to pieces; a larger percentage ofscreenings is also made, although not so large as might
Pulp and paper magazine of Canada . the first two hours after dressing was 3 tons ofbone-dry pulp in 24 hours, and the power consumption perton 112 horsepower. After tons of pulp had beenmade and the stone had become dull the production fell tons in 24 hours, and the power consumption increasedto horsepower per ton for the same grinding condi-tions. poor, consisting of very fine fiber intermixed with coarserparticles. When a very sharp surface is used, the woodfibers are literally ground to pieces; a larger percentage ofscreenings is also made, although not so large as might beexpected. Under such conditions the fibers are ground soshort and fine that it is almost impossible to remove thelap from the wet-machine press roll. Deep grooving of the surface of the stone causes morerapid production of pulp, but at the sacrifice of high power without excessive sharpness of the stoneis used, the grit of the stone comes more into play. Infact, the grit of the stone, more than any other factor, in-. Fig. I). -Spiral-cut Burr, six m l he inch (Advani i I | in hes in cro sing 3 inch face) 5 (iS PULP A N J) PAPER MAGAZINE August 15, 1913 fluences the quality of pulp produced under conditions of result, the pressure drops off each time one of the pistons ishigh power consumption. raised or lowered. In order to emilinate this effect some KM • * ?•• ? ;.- ? - - f V-V - , -• : \ :. : .? r1 . ./ & - : :? ? f .? ?i s , *,• , . * ? :7 ;>/• -.* ? fj; ?•? * . i . « ,?. Fig. E.—Surface of Stone, freshly dr Pressure on Grinder Cylinders. For any given cylinder pressure, the pressure at which thewood is forced upon the revolving grindstone varies greatly mills have installed triplex or centrifugal-pressure pumpswhich are direct
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaperma, bookyear1903
