. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. blown into the diffuser, a baffle plate is securelyfastened; this plate is cone shaped, with the vertex upwards, andserves to spread the pulp, so the bottom of the diffuser will not beexposed to the shock of the inrushing charge; it serves also to distribute wash water. A false bottom consisting of screen F is placed as near as possibleto the bottom of the diffuser. This false bottom must be of verystrong construction, and its purpose is to make the draining areafor the liquor as large as possible without
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. blown into the diffuser, a baffle plate is securelyfastened; this plate is cone shaped, with the vertex upwards, andserves to spread the pulp, so the bottom of the diffuser will not beexposed to the shock of the inrushing charge; it serves also to distribute wash water. A false bottom consisting of screen F is placed as near as possibleto the bottom of the diffuser. This false bottom must be of verystrong construction, and its purpose is to make the draining areafor the liquor as large as possible without letting any fiberthrough. The screen plate is usually TV inch thick, with ftinch perforations, spaced ft inch between centers L nderneaththis top screen plate is a coarse wire screen which keeps the topplate from contact with the heavy bottom plate and insures thatthe liquor will drain through all the holes of the top plate. Thelower plate, which gives the false bottom its strength, is madefrom |-inch wrought iron, drilled with A-inch holes, spaced 52 MANUFACTURE OF SULPHATE PULP §6. Fig. 13. §6 THE DIFFUSER ROOM 53 1 inch between centers. All plates are made in sections, whichcan easily be taken out and replaced. The false bottom issupported on I beams, placed across the diffuscr, and on anangle iron that is riveted to the shell and extends all around thewall. The empty space under the false bottom is partly filled withconcrete, which serves as a support for the beams and also de-creases this space. If there is too much room under the screen,the space must be filled with liquor before the diffuser is blowninto; otherwise, the false bottom will be subjected to a ratherhard strain by the rapid flow of liquor through the screen at thestart of the blowing; also, considerable fiber will find its waythrough the screen during this period of forced draining. Whena concrete filling is put in, care must be taken to give a freepassage for the liquor from every point of the bottom to th
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
