Chapters on Papermaking

Chapters on Papermaking

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... the cost for friction of engine and shafting, (V) for friction of empty beater, (c) for the circulation of the stuff and for the beating proper, including the friction of bars against the bed-plate, can be easily arrived at by a simple calculation, provided that the Hollander is similar in type to the above, and worked with similar materials. Table XIV. gives us figures which we have not been able to obtain from previous tests. It distinguishes between the circulation and the beating. It will be noticed that the power required for circulating and agitating the stuff in the beater is 38-5 per cent., a much larger item of cost than for friction of the empty beater, which is 9-3 per cent, of total. It will furthermore be noticed that the beating proper, together with the friction of bars against the bed-plate, absorbs 41-9 per cent. of the total power, and only slightly more than the power absorbed by circulation and agitation of the stuff. I shall endeavour to show hereafter how to distinguish between the circulation and the agitation of the stuff by a few simple observations and a simple calculation, which can be done in almost any mill. But in order to make these figures of practical value, it would be far more useful to have the full data as contained in Table XIII. for the purposes of comparison. There is little doubt in my mind, from the few rough observations I have already made, that the power required for the actual circulation of the stuff round the Hollander, which can be gauged by the. power necessary to raise the stuff from the height of the bed-plate to the level of the back fall, is very small in comparison to the amount of power absorbed in agitating and churning the stuff about. On referring to an earlier part of this work, it will...show more

Product details

  • Paperback | 56 pages
  • 189 x 246 x 3mm | 118g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236643984
  • 9781236643988