. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ts dry enough to hold togetherand enable them to be folded or lapped into a bundle. The pro-cess by which this result is accomplished is called lapping, andthe bundle thus obtained is called a lap. The lap contains from 30% to 45%, by weight, of air-dry fiber,depending upon the type of machine used to extract the machines, usually called wet presses, are all the samein principle; they make use of a cylinder and vat, similar tothat of the slush machine with couch roll, and which was pre-viously d
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ts dry enough to hold togetherand enable them to be folded or lapped into a bundle. The pro-cess by which this result is accomplished is called lapping, andthe bundle thus obtained is called a lap. The lap contains from 30% to 45%, by weight, of air-dry fiber,depending upon the type of machine used to extract the machines, usually called wet presses, are all the samein principle; they make use of a cylinder and vat, similar tothat of the slush machine with couch roll, and which was pre-viously described. They differ, however, in the arrangementof the part which presses the water from the sheet formedon the cylinder. An endless woolen felt picks up the sheetfrom the cylinder and runs between one or more pairs ofsqueeze rolls, which press the water out, and the pulp may thenbe collected in sheets or bundles. This is a continuous process. §7 TREATMENT OF PULP AFTER SCREENING 61 55. A wet press is shown in Fig. 19, the various parts anddetails of which are numbered as follows:. • •••.••.:.; 1, vat; 2, couch roll; 3, white-water discharge box fromthe cylinder; 4, white-water discharge pipe from cylinder- 5cylinder; 6, 7, 8, felt rolls; 9, felt-roll-stretch roll; 10, felt roll- 62 TREATMENT OF PULP §7 guide roll; 11, suction box; 12, whipper; 13, 14, felt rolls; 15,hand wheel; 16, screw; 17, spring; 18, top press roll; 19, bottompress roll; 20, stand; 21, pulp table; 22, top press-roll bearing; 23,bottom press-roll bearing; 24, line of pressure between couch rolland cylinder; 25, inlet for stock; 26, clean-out for vat. The pulp sheet-forming part is essentially the same as that forthe slush machine, or decker; but it carries the process farther,by pressing more water out and delivering the pulp in a sheet orbundle. An endless woolen felt passes between the couch roll 2and the cylinder 5. The layer of pulp that has been collectedon the surface of the cylinder i
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
