A1 Journal article (refereed)
Behavior of Decayed Spruce (Picea abies) during Kraft Pulping (2020)

Halonen, M., & Alen, R. (2020). Behavior of Decayed Spruce (Picea abies) during Kraft Pulping. Paper and Biomaterials, 5(4). https://doi.org/10.12103/j.issn.2096-2355.2020.04.001

JYU authors or editors

Publication details

All authors or editors: Halonen, Markku; Alen, Raimo

Journal or series: Paper and Biomaterials

ISSN: 2096-2355

Publication year: 2020

Volume: 5

Issue number: 4

Publisher: Paper and Biomaterials Editorial Board

Publication country: China

Publication language: English

DOI: https://doi.org/10.12103/j.issn.2096-2355.2020.04.001

Publication open access: Not open

Publication channel open access:


This study indicated that by applying an improved classification system to decayed large-diameter Norway spruce (Picea abies) wood, its use as raw material for kraft pulping without loss of pulp quality could be essentially increased. This is based on the fact that although the cooking yield of decayed spruce material which has been sorted according to these new recommendations is somewhat lower and Kappa number higher than those of sound wood material, the greatest part of the decayed stem (the outer part of the stem) contains long-fiber wood material which produces pulp of good quality. Therefore, large-diameter spruce logs can also be separately used, for example, in the manufacture of reinforcement pulp.

Keywords: pulping; raw materials; Norway spruce; decay (matter); decayed wood

Free keywords: kraft pulping; wood decay; fungal decay; softrot

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 0

Last updated on 2021-07-07 at 21:35