Startseite Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
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Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs

  • Ping Xu , Lloyd Donaldson , John Walker , Robert Evans und Geoffrey Downes
Veröffentlicht/Copyright: 1. Juni 2005
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Holzforschung
Aus der Zeitschrift Band 58 Heft 6

Abstract

The roles of density and microfibril angle in causing low stiffness in radiata pine butt logs were studied in detail on a 17-year-old tree. Distributions of these variables were compared with stiffness variations in the vertical direction. Results supported the hypothesis that cell ultrastructure is responsible for the vertical variation in stiffness. The microfibril orientation in tangential wall is considered to be an important factor contributing to wood stiffness because of the smaller microfibril angles compared with radial microfibril angles, and also because of the larger decrease of the microfibril angles with the rapid increase of wood stiffness in vertical direction especially in corewood zone. The microfibrils in the S3 layer fall from over 80° to angles of 54° and 51° for radial and tangential cell walls at the top of the butt log. Further study is needed for fully understanding the characteristics of S3 layers.

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Published Online: 2005-06-01
Published in Print: 2004-10-01

© Walter de Gruyter

Artikel in diesem Heft

  1. Subject Index
  2. Contents
  3. Species Index
  4. Author Index
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  6. Voltammetric analysis of the bleachability of softwood kraft pulps
  7. Alkaline degradation of model compounds related to beech xylan
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  9. Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
  10. Carbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
  11. Ozonation of pine kraft lignin in alkaline solution. Part 1: Ozonation, characterization of kraft lignin and its ozonated preparations
  12. Ozonation of pine kraft lignin in alkaline solution. Part 2: Surface active properties of the ozonated kraft lignins
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  15. Evaluation of hydrocarbon emissions from heart- and sapwood of Scots pine using a laboratory-scale wood drier
  16. Effect of pulsating tension-torsion combined loading on fatigue behavior in wood
  17. Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
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