. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. with their level below the top of the dam-boards 2, thus making a seal and keeping the rotation of the stonefrom throwing pulp out into the grinder room. The object ofimmersing the grindstone in the stock is to aid in cleaning thesurface of the stone, to equalize the temperature of stone, to 30 MANUFACTURE OF MECHANICAL PULP §3 prevent loss of fibers (due to low consistency), during filling ofpockets, and to keep stock from being thrown out of pockets. The width of the dam-boards 2 is the same as the dista
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. with their level below the top of the dam-boards 2, thus making a seal and keeping the rotation of the stonefrom throwing pulp out into the grinder room. The object ofimmersing the grindstone in the stock is to aid in cleaning thesurface of the stone, to equalize the temperature of stone, to 30 MANUFACTURE OF MECHANICAL PULP §3 prevent loss of fibers (due to low consistency), during filling ofpockets, and to keep stock from being thrown out of pockets. The width of the dam-boards 2 is the same as the distancebetween the side casings, and the usual clearance betweenstone and bottom of pit is 6 to 8 inches. The distance betweenapron 3 and the dam-boards 2 varies from 6 to 15 inches. Thereis much variation in the arrangement of the grindstone pits, causedprincipally by the different ideas of the various pulp makers. Thestone rotates left-handed, or counterclockwise. 48. Piping.—Fig. 19 shows the general arrangement of thepiping on a hand-fed grinder. A is the high-pressure water main,. Fig. 19. with regulating valves B, C, and D supplying pressure water tothe reversing valves on each cylinder at E, F, and G. Since thetype of grinder shown is of the movable-pocket type, it will benoticed that there is a section of high-pressure, rubber hose Hattached to the reversing valve, to allow pocket adjustments tobe made. The connections J, I, K from the reversing valves,are for carrying away the water relieved from the cylinders, andfor discharging it at P into the stock sewer. These also have arubber-hose section L, as in the case of pressure water. An example will serve as the best means of calculating theamount of high-pressure water that will be required. The caseof a three-pocket grinder, using wood 32 inches long, with a §3 (WINDERS AND GRINDING 31 pressure of 65 lbs. per sq. in., in a 16-inch diameter, 20-inchstroke, cylinder will be used. Volume of water used for one cylinder ful
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