. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. e by means of the heavy steel bolts9, which are attached to the bridge trees. Mounted upon eachpocket is a hydraulic cylinder 10, containing a piston similarto that in a steam engine. The reversing valve 11 controls the 1 Dry pulp fibers absorb moisture when exposed to the air. The amountabsorbed varies with the humidity of the air. Air-dry pulp, commerciallyis 90% bone-dry fiber and 10% water. 14 MANUFACTURE OF MECHANICAL PULP §3 flow of water, under pressure, in and out of each end of thiscylinder. When
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. e by means of the heavy steel bolts9, which are attached to the bridge trees. Mounted upon eachpocket is a hydraulic cylinder 10, containing a piston similarto that in a steam engine. The reversing valve 11 controls the 1 Dry pulp fibers absorb moisture when exposed to the air. The amountabsorbed varies with the humidity of the air. Air-dry pulp, commerciallyis 90% bone-dry fiber and 10% water. 14 MANUFACTURE OF MECHANICAL PULP §3 flow of water, under pressure, in and out of each end of thiscylinder. When water is admitted on the top of the piston, thepiston advances toward the stone, and piston rod 12 transmitsthe water pressure by means of the pressure foot 13, which actsupon the sticks of prepared wood placed in the pockets. Whenthe wood is ground, the reversing valve is operated, and the pres-sure foot 13 is raised, to allow a new charge of wood to be put intothe pockets. The stone is cooled and cleaned by means of thewhite water,1 which flows through shower pipe 14 upon the back. Fig. 5. of the stone. The mixture of pulp and water collects in the pit15 beneath the stone and falls over the dam 16 of the pit, intothe stock sewers (channels or pipes) beneath the grinders. Whenthe stone becomes dull, it is sharpened with a burr, passed overits surface by means of a lathe or trueing device 17, which ismounted on the back of the casing. GRINDSTONES 26. Origin.—Natural sandstones having special physical properties are in universal use for the manufacture of mechanical pulp. They are quarried for commercial use in the Newcastle 1 White water is water returned to the grinder room from other parts of themill, after most of the fibers are strained out of it. The name comes fromits color, which is due to particles of fiber, resins, and oils that it solids are from % to by weight. §3 GRINDERS AND GRINDING 15 District in England, in Virginia and Ohio, in the U
Size: 2137px × 1170px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
