. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. d is the opening through which thechips are charged into the digester from the chip bin above it; atthe lower end is the blow valve for discharging the cooked pulpto the blow pit. The shell of the digester is made thick around allopenings, to form a heavy ring or boss; these bosses are faced offsmooth, to allow flanges to be bolted to them for attaching covers,pipes, and valves. The working floor of the digester house is near the top of thedigester; the digester operator, or cook, does most of his work ont
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. d is the opening through which thechips are charged into the digester from the chip bin above it; atthe lower end is the blow valve for discharging the cooked pulpto the blow pit. The shell of the digester is made thick around allopenings, to form a heavy ring or boss; these bosses are faced offsmooth, to allow flanges to be bolted to them for attaching covers,pipes, and valves. The working floor of the digester house is near the top of thedigester; the digester operator, or cook, does most of his work onthis floor. 40. Description of Digester.—The upright, or vertical, digesterA, Fig. 7, has a false bottom N shaped like an inverted cone; itis made of sections of perforated steel plate, bolted together andtapering to the discharge hole F in the center of the is an opening for the steam pipe T in the side or bottom ofthe digester, below where the false bottom joins the digester,and there may be another opening for the circulating pipe. The 28 MANUFACTURE OF SODA PULP §5. Fig. 7. §5 THE COOKING PROCESS IN A SODA MILL 29 design of this digester, with its lower cone L, is largely a matterof construction. The steam is controlled by globe valve Vhcheck valve F2, and plug valve V3. The relief line and valveconnect with the digester at R. Vt is the blow valve, operatedby hand wheel W. C is the working-floor level. The manhole end of the digester has been constructed inseveral different ways, three of which are shown in Fig. 8. InFig. 8 (a), a cast-iron throat piece 1 is bolted to the boss 2 aroundthe manhole; the joint is made tight by means of a sheet-lead
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
