. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. es. 14. Stone Roll Beater.—In the treatment of mill waste, suchas groundwood screenings, splinters, and slivers, sulphite andsulphate screenings, and knots, as well as other mill rejections,the stone roll beater, one example of which is shown in Fig. 5,has proved quite effective. It is fitted with a washing drum(water extractor) when desired. The apparatus is built in vari- 10 REFINING AND TESTING OF PULP §8 ous sizes, to meet the demands of large and small mills; it isalways open to the view of the operat
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. es. 14. Stone Roll Beater.—In the treatment of mill waste, suchas groundwood screenings, splinters, and slivers, sulphite andsulphate screenings, and knots, as well as other mill rejections,the stone roll beater, one example of which is shown in Fig. 5,has proved quite effective. It is fitted with a washing drum(water extractor) when desired. The apparatus is built in vari- 10 REFINING AND TESTING OF PULP §8 ous sizes, to meet the demands of large and small mills; it isalways open to the view of the operator. A refiner of about 2300 pounds capacity, dry, for each chargeof 7% consistency requires only about 80 for an output of12 to 14 tons of refined pulp per 24 hours; this is equivalent toabout 6 daily per ton of pulp. It is possible, with thismachine, to obtain refined screenings superior in strength to theaccepted stock from the first screening. The screenings, etc., and water, are run into the tub T, whichis an elliptically shaped trough, and which surrounds the parti-. FlG. tion, or midfeather, M. The roll R, the surface of which is aset of stone blades C, and which is covered by a hood (notshown) is hung on a shaft that is driven by pulley P. The stockis introduced at T; and as the roll turns, the roll drives the stockbetween it and the bedplate of stone at D. This action not onlyrubs the fibers but it also causes circulation of stock in the distance between the roll and the bedplate is controlled bythe levers L (one at each end of the roll shaft), which are raisedand lowered by the hand wheel H. The weight of the roll on thefiber is relieved as desired by moving counterpoise weight IF alongthe lever arm A, which has a tendency to lift the lever (fighter) Jordan Type.—This type of refiner, which is the one firstused and the one still employed most extensively for the finalbrushing out of fiber-stock previously prepared for the papermachine, h
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
