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The effect of eucalypt pulp xylan content on its bleachability, refinability and drainability

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Abstract

Currently, bleached eucalypt pulps are largely used for printing and writing (P&W) and sanitary (tissue) paper grades. Among the many pulp quality requirements for P&W and tissue paper production the xylan content is one of the most significant. For P&W papers, increasing xylans improve pulp refinability and strength properties but negatively affect bulk and drainability. For tissue paper, xylans are purportedly advantageous during paper drying in the Yankee cylinder but negatively affect paper bulk and may increase dusting during paper manufacture. On the other hand, bleachability is a very important parameter for both P&W and tissue grade pulps since bleaching cost is the second most significant in eucalypt bleached kraft pulp production. The aim of this study was evaluating the influence of eucalyptus pulp xylan content on its bleachability, refinability and drainability. A sample of industrial unbleached eucalyptus kraft pulp containing 15.6 % xylans was treated with various alkali charges at room temperature in order to obtain materials with different xylan contents. The pulps were bleached to 90 % ISO brightness with the O–DHT–(EP)–D sequence and evaluated for their refinability and drainability. By increasing the alkali concentration in the range of 10–70 g/L pulps of 14.5–5.9 % xylans were produced with no significant impact on cellulose crystallinity. The decrease of xylan content significantly decreased pulp bleaching chemical demand, water retention value and refinability and increased pulp drainability.

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Authors and Affiliations

  1. Pulp and Paper Laboratory, Federal University of Viçosa, Viçosa, MG, CEP 36570-000, Brazil

    Valéria J. Gomes, Dalton Longue Jr., Jorge L. Colodette & Robisnéa A. Ribeiro

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  1. Valéria J. Gomes
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  2. Dalton Longue Jr.
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  3. Jorge L. Colodette
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  4. Robisnéa A. Ribeiro
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Correspondence to Dalton Longue Jr..

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Gomes, V.J., Longue, D., Colodette, J.L. et al. The effect of eucalypt pulp xylan content on its bleachability, refinability and drainability. Cellulose 21, 607–614 (2014). https://doi.org/10.1007/s10570-013-0104-3

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  • DOI: https://doi.org/10.1007/s10570-013-0104-3

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