. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. a general layout of a system of this is supplied to the suction side of centrifugal pump K,which operates at constant speed and delivers water at a pressureof 25-50 lbs. per sq. in. above the average operating pressure inthe grinder cylinder. The air tank F performs the same func-tion as in Fig. 50. The pressure-control valve at G varies thepressure in the grinder hydraulic-cylinders by throttling thehigh-pressure water that is delivered by the pump to the lowerpressure at the discharge side H o
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. a general layout of a system of this is supplied to the suction side of centrifugal pump K,which operates at constant speed and delivers water at a pressureof 25-50 lbs. per sq. in. above the average operating pressure inthe grinder cylinder. The air tank F performs the same func-tion as in Fig. 50. The pressure-control valve at G varies thepressure in the grinder hydraulic-cylinders by throttling thehigh-pressure water that is delivered by the pump to the lowerpressure at the discharge side H of the control valve G. Thevariation in the action of the control valve G is caused by thesprocket-and-chain drive, which connects shaft / to control- % MANUFACTURE OF MECHANICAL PULP §3 valve chive shaft at ./. If one pocket goes off (jams, or is openedfor charging), the small speeding up of the grinders, due to loaddecrease, operates the control valve G, thus putting more pressurein the remaining cylinders and tending to maintain constant thetotal friction load of wood on Fig. 51. This system has many desirable features, and it is claimed thatit saves as much as 15% of power and labor usually employed inthe grinder department of mechanical-pulp mills. For motor-driven grinders, there are several systems in use,the object being to maintain a more uniform load on the drivingmotor. The operation of these regulators is practically the sameas the governor on magazine grinders, which has already beendescribed. QUESTIONS 1. Mention some factors which cause a variation in the power consumedin the production of the same quality of pulp in different mills. 2. What grade of stone and condition of surface is satisfactory for theproduction of newsprint pulp? §3 THE MECHANICAL-PULP MILL 97 3. What change in the method of dressing the .stone mighl be made whenproducing pulp for wall board? 4. What quality of pulp is desired for the manufacture of manila paper? 5. (o) What is mea
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
