. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. Fig. 28. wmh Fig. 29. the pulpwood stick. Note that the burr rolls over the surface ofthe stone. In Fig. 29, 1 represents a segment of the grindstone;2, the partially ground pulpwood stock; 3, number of threadmarks per inch of width of stone (this corresponds with the pitch,cut, or number of burr used for dressing the stone); 4 representsthe direction of rotation of the stone relative to the axis of pulp-wood stick; 5 is a section of the surfaces in contact between thepulpwood and grindstone, showing the m
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. Fig. 28. wmh Fig. 29. the pulpwood stick. Note that the burr rolls over the surface ofthe stone. In Fig. 29, 1 represents a segment of the grindstone;2, the partially ground pulpwood stock; 3, number of threadmarks per inch of width of stone (this corresponds with the pitch,cut, or number of burr used for dressing the stone); 4 representsthe direction of rotation of the stone relative to the axis of pulp-wood stick; 5 is a section of the surfaces in contact between thepulpwood and grindstone, showing the meshing of the grooves inthe stone and wood. It will be noted that the grooves cut in the surface of the stoneare nearly perpendicular to the axis of the pulpwood beingground; also, that a fiber, after being separated from the stick,is subject to re-grinding in the exposed grooves shown at 5. The 50 MANUFACTURE OF MECHANICAL PULP §3 ridges of the stone, therefore, have a tendency to cut off and re-grind the fiber. Consequently, the fiber made by the threadburr is short, and has a tendency to
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
