. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. of which may be represented by r0 Thusfrom formula (1), pcc ° 20 (c - c) (3) and from formula (2), I n — c-c (4) the same conditions as in the example of the lastarticle, what must be (a) the freight rate in order that the saving in J^t equal the cost of pressing? (6) Suppose the consist,,,,,- of thenber to be 32% before pressing and 54% after pressing, the cost of press-ing $ per ton; what must be the freight rate that the saving infreight may equal the cost of pres
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. of which may be represented by r0 Thusfrom formula (1), pcc ° 20 (c - c) (3) and from formula (2), I n — c-c (4) the same conditions as in the example of the lastarticle, what must be (a) the freight rate in order that the saving in J^t equal the cost of pressing? (6) Suppose the consist,,,,,- of thenber to be 32% before pressing and 54% after pressing, the cost of press-ing $ per ton; what must be the freight rate that the saving infreight may equal the cost of pressing? Solution.—(a) Applying formula (3) to find the rate per 100 11, 2^X:35_x^50 250 X .35 X .50 20 (.50 - .35) $146~ - -20(.35 - .50) = 14-6c^ts. Ans. (b) r = 295 X .32 X .54 ° ~20(.54 - .32) = -6-cents. Ans. 76 TREATMENT OF PULP §7 66. Hydraulic Press and Accumulator.—Fig. 24 is an illustra-tion of a hydraulic-press system, including pressure pump andaccumulator. The drawing is conventional, because it showsthree elevations, (a), (b), and (c), projected on the same plane. Fig. 24. but separated. Thus, in reality, (6) should be projected on (a),since the bases of both machines lie in the same horizontal plane(the floor), as does also the apparatus (c). Also, the pipingappears much as it would be shown on a plan view, instead of in §7 TREATMENT OF PULP AFTER SCREENING 77 elevation. With this understood, (a) is an elevation of the press,(6) is an elevation of the pump, and (c) is an elevation of theaccumulator. The various parts are numbered as follows: 1, support for pulp truck (stationary platen); 2, rods supportingcylinder, forming guides for moving platen, and resisting pressure;3, moving platen, moves vertically up and down; 4, packinggland; 5, drawback cylinders; 6, pressure cylinder; 7, pressurevalve control handle; 8, lever to raise or lower track frame; 9,pulp truck; 10, operating valve; 11, check valve; 12, high-pres-sure pipe; 13, pressure pump; 14, valve c
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
