European Journal of Wood and Wood Products

, Volume 74, Issue 1, pp 101–108 | Cite as

The effect of eucalypt tree overaging on pulping and paper properties

  • Jorge GominhoEmail author
  • Ana Lourenço
  • Duarte Neiva
  • Luís Fernandes
  • Maria Amaral
  • Ana Paula Duarte
  • Rogério Simões
  • Helena Pereira


Overaged trees of Eucalyptus globulus were evaluated to determine their aptitude for pulping with industrial chips as reference. The overaged wood was separated into sapwood and heartwood. Compared with industrial chips, the overaged E. globulus heartwood and sapwood contained approximately 1.5 times more extractives (3.8 vs. 5.2 and 5.9 %), similar amounts of lignin (21.4 vs. 23.3 and 19.9 %) and the holocellulose ranged from 69.5 % (heartwood) to 74.5 % (industrial chips). Overaged heartwood and sapwood produced kraft pulps with 44.6 % yields (48.4 % from industrial chips). The unbeaten pulps from overaged heartwood and sapwood compared with industrial chips have wider cells (19.5–20.7 vs. 17.7 µm), and higher coarseness (0.066–0.097 vs. 0.060 mg m−1) and more primary fines (27.4–27.5 vs. 16.6 %). Overaged wood produced handsheets with lower bulk density and higher water retention value (2.25–2.93 vs. 1.12 g/g). The refining behavior was similar as well as the tensile and tear strength development. The results show that overaged E. globulus trees with large diameters may be introduced into the pulp feedstock without extensive impacts on the pulp characteristics.


Kraft Pulp Pulp Fiber Kappa Number Pulp Yield Bleached Pulp 
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The research was financed by FEDER through the Operational Program for Competitive Factors of COMPETE, and by the Portuguese Science Foundation (FCT), through R&D project PTDC/AGR-CFL/110419/2009, and base funding to the Forest Research Center (CEF) under PEst-OE/AGR/UI0239/2014. The authors thank PortucelSoporcel group and in particular Eng. Eduardo Figueira for supplying the raw material.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Jorge Gominho
    • 1
    Email author
  • Ana Lourenço
    • 1
  • Duarte Neiva
    • 1
  • Luís Fernandes
    • 2
  • Maria Amaral
    • 2
  • Ana Paula Duarte
    • 3
  • Rogério Simões
    • 2
  • Helena Pereira
    • 1
  1. 1.Centro de Estudos Florestais, Instituto Superior de AgronomiaUniversidade de LisboaLisbonPortugal
  2. 2.Research Unit of Textile and Paper MaterialsUniversidade da Beira InteriorCovilhãPortugal
  3. 3.Centro de Investigação em Ciências da SaúdeUniversidade da Beira InteriorCovilhãPortugal

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