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Papers and Addresses Presented at the Annual Meeting of the Technical Association of the Pulp and Paper Industry Volume 1

Papers and Addresses Presented at the Annual Meeting of the Technical Association of the Pulp and Paper Industry Volume 1


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About the Book

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. 1918 Excerpt: ...due mostly to the free rosin present in the sheet. Several of the investigators agree that by an excess of alum, even though aluminum resinate is formed first, much free rosin results depending on the amount of sulphate of alumina used, basic aluminum sulphate being formed at the same time. In the presence of cellulose fibers (and these must be included in the discussion) we know that about two thirds more alum is required to precipitate the size than without them. This is due to an affinity of cellulose fibers for alum solutions; to satisfy this affinity, which varies more or less with pulps from different sources and even from the same source, alum must be added in slight excess. This excess being also necessary to set or mordant the added dyestuffs, we have conditions right for the formation of free rosin from the combined rosin in the original size solution, together with the free rosin present as such in the original size. It is therefore, reasonable to suppose that the sizing of paper pulp is mainly dependent on the free rosin. The original rosin as used by papermakers has a distinct color and since most of the writing papers manufactured as a whole are "whites" it follows that to get the most brilliant white, we should add as little rosin (and other chemicals) to the beater as possible 5 percent by the presence of rosin. A possible explanation of this may be that free rosin being an acid body (abietic acid) may unite chemically to some extent with cellulose and thus decrease its strength. It is the writer's experience that by starting with a high free-rosin soap (40 percent free or more dry basis) and furnishing approximately half the amount of rosin (pound for pound) as when using a prepared rosin soap of much lower free rosin content and ...


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Product Details
  • ISBN-13: 9781130276312
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130276317
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 113 gr


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