Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

 Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.


  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Ross Swaney; Masood Akhtar; Eric Horn; Michael Lentz; John Klungness; Marc Sabourin
    Date: 2003
    Source: 2003 TAPPI Fall Technical Conference: Engineering, Pulping & PCE&I. Atlanta, GA: TAPPI Press, 2003: [5] pages.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (155 KB)

    Description

    In this paper we introduce a new technology based on a mild chemical pretreatment process prior to mechanical pulping. Chips are treated with a dilute solution of oxalic acid (OA) for only 10 minute at 130°C, in a typical example. The properties of the pulp produced by this OA process are quite different from those obtained via conventional chemical pretreatments, providing a much more valuable pulp, and at higher yields. Refining results obtained at the Andritz Pilot Plant in Springfield, Ohio show an outstanding combination of strength improvements, energy savings, and shive and triglycerides reduction, with only a modest loss in brightness. Under suitable conditions the light scattering coefficient of the oxalic-treated treated chips was fully recovered without losing the above benefits. Maintaining light scattering coefficient with this treatment is of great interest, particularly to those mills producing lightweight coated paper (LWC). Refining results are presented here, along with an evaluation of the process economics for a LWC example case. Based on strength improvements (kraft replacement in the final furnish) and energy savings, the production cost savings are substantial. For the LWC example, at least $9 million/year net savings before license fees can be realized in an operation producing 372 t/d of OA mechanical pulp for 600 t/d of blended LWC furnish. Based on this strong economic potential, several mechanical pulp mills have expressed interest in conducting in-mill evaluations. Planning for mill trials is currently underway.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Swaney, Ross; Akhtar, Masood; Horn, Eric; Lentz, Michael; Klungness, John; Sabourin, Marc. 2003. Oxalic acid pretreatment for mechanical pulping greatly improves paper strength while maintaining scattering power and reducing shives and triglycerides. 2003 TAPPI Fall Technical Conference: Engineering, Pulping & PCE&I. Atlanta, GA: TAPPI Press, 2003: [5] pages.

    Keywords

    Mechanical pulping, oxalic acid, paper strength, light scattering, shives, triglycerides

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/7030