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Wood Research and Technology


Cellulose – Hemicelluloses – Lignin – Wood Extractives

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Volume 67, Issue 5


Chemistry and kraft pulping of seven hybrid aspen clones. Dimension measurements on the vessels and UMSP of the cell walls

Inese Sable / Uldis Grinfelds / Martins Zeps
  • Latvian State Forest Research Institute “Silava”, 111 Rigas Str., LV-2169 Salaspils, Latvia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ilze Irbe / Guna Noldt / Aris Jansons
  • Latvian State Forest Research Institute “Silava”, 111 Rigas Str., LV-2169 Salaspils, Latvia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Arnis Treimanis / Gerald Koch
  • Johann Heinrich von Thünen-Institute (vTI)/Federal Research Institute for Rural Areas, Forestry and Fisheries Institute of Wood Technology and Wood Biology (HTB), Hamburg, Germany
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Published Online: 2013-02-11 | DOI: https://doi.org/10.1515/hf-2012-0184


Micropropagated hybrid aspen clones (Populus tremuloides Michx.×Populus tremula L.) and a plus-tree (superior phenotypes selected) aspen (Populus tremula L.) were grown under similar conditions in the central part of Latvia. After cutting at the age of 12 years, 64 sample trees were examined. The dimensions of the vessels and the content of cellulose, lignin, extractives and ash were determined. The cell walls were characterised by UV microspectrophotometry (UMSP) in the UV range. The dimensions of fibres obtained by kraft pulping were determined such as length, width, and their shape factors. Coarseness measurements were performed, and strength properties of the handsheets were tested. One of the clones (no. 44) had a significantly higher stem volume of 208 dm3 and stem diameter of 17 cm at a height of 1.3 m. This clone had otherwise no notable differences to the other clones concerning the chemical composition, except a slightly higher lignin content (20.0% as compared with the mean value of 19.3% for other clones). Kraft cooking of hybrid aspen chips gave pulp yields in the range of 48.6–52.4%. Slightly higher strength properties (10–15%) were found for the handsheets prepared from a common aspen pulp (reference) as compared with those from hybrid aspen fibres.

Keywords: kraft pulping; paper strength; tensile index; topochemistry; UV microspectrophotometry (UMSP); vessels


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About the article

Corresponding author: Arnis Treimanis, Latvian State Institute of Wood Chemistry, 27 Dzerbenes Str., LV-1006 Riga, Latvia, Phone: +371 29258122, Fax: +371 67550635

Received: 2012-10-31

Accepted: 2013-01-04

Published Online: 2013-02-11

Published in Print: 2013-07-01

Citation Information: Holzforschung, Volume 67, Issue 5, Pages 505–510, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2012-0184.

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