. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. fter being cut by the chipper, the chipscontain from to 5% of sawdust and from to 3% ofslivers. In order to separate the good chips from the sawdustand slivers, machines called chip screens are employed. Figure 25 shows a chip screen of the rotary type, which has alength of 30 ft. and a diameter of 5 ft. The screen cylinder A §2 THE WOO I) ROOM 43 is built up of circular rings E, securely bolted together, and towhich the screen plates F are fastened. The rings E revolveon cast-steel rollers //, w
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. fter being cut by the chipper, the chipscontain from to 5% of sawdust and from to 3% ofslivers. In order to separate the good chips from the sawdustand slivers, machines called chip screens are employed. Figure 25 shows a chip screen of the rotary type, which has alength of 30 ft. and a diameter of 5 ft. The screen cylinder A §2 THE WOO I) ROOM 43 is built up of circular rings E, securely bolted together, and towhich the screen plates F are fastened. The rings E revolveon cast-steel rollers //, which are driven on parallel shafts Kby a pair of bevel gears and pinion L. Rollers at T take care ofthe end thrust of the cylinder. The first (upper) 15 feet of thisscreen has \-\ holes, punched as close together as the platewill permit, to allow the sawdust to pass through them and outof the screen. The steel plate on the lower 15 feet is perforatedwith 2 XI slots, to allow the chips to pass through to the hopperN. The large chips and slivers leave the screen at the lower end, F E^. Fig. 25. and from there are conveyed to the chip crusher or to the re-chipper. The sawdust, which falls into the hopper M, may beblown to the boiler house by means of a small blower, whichis driven by a motor; and the chips falling in the hopper Nare conveyed direct to the chip bin in the digester house. Thisscreen has a capacity of 18 cords per hour and revolves at ; it requires a 10- to motor to operate it. 60. Shaker Type.—A flat screen of the shaker type is shownin Fig. 26. A reciprocating motion is given to the screen byeccentrics and rods Ei and Eit which are located on the drivingshaft F and are connected to the tables T\ and T-2, the latter beinginclined at an angle of about 8° to the horizontal. The chips(together with the sawdust and slivers) are fed to the top of thetable Til the chiPs and sawdust pass through the 2 XIslots in the steel plates forming the botto
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
