Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
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Ping Xu
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.
References
Barber, N.F., Meylan, B.A. (1964) The anisotropic shrinkage of wood – A theoretical model. Holzforschung18:146–156.10.1515/hfsg.1964.18.5.146Suche in Google Scholar
Buchanan, A.H., Nakada, R., Walker, J.C.F. (1999) Log segergation by stiffness class. 3rd Wood quality symposium: Emerging technologies for wood processing, Rotorua, New Zealand and Melbourne, Australia, p. 9.Suche in Google Scholar
Butterfield, B., Pal, V. (1998) Relating microfibril angle to wood quality in clonal seedlings of radiata pine. Proceedings International workshop on microfibril angle, Westport, New Zealand. pp. 337–347.Suche in Google Scholar
Cave, I.D. (1997a) Theory of x-ray measurement of microfibril angle, Part 1: The condition for reflection, Wood Sci. Technol.31:143–152.10.1007/BF00705881Suche in Google Scholar
Cave, I.D. (1997b) Theory of x-ray measurement of microfibril angle, Part 2: The diffraction Pattern. Wood Sci. Technol.31:225–234.10.1007/BF00702610Suche in Google Scholar
Cave, I.D., Walker, J.C.F. (1994) Stiffness of wood in fast-grown plantation softwoods: the influence of microfibril angle. Forest Prod. J.44(5):43–48.Suche in Google Scholar
Cown, D.J, McConchie, D.L. (1982) Rotation age and silvicultural effects on wood properties of four stands of Pinus radiata. New Zealand J. Forestry Sci.12(1):71–85.Suche in Google Scholar
Cown, D.J., McConchie, D.L., Young, G.D. (1991) Radiata pine wood properties survey, FRI Bulletin No. 50 (Revised edition), Forest Research Institute, New Zealand.Suche in Google Scholar
Cown, D.J. (1992) Corewood (juvenile wood) in Pinus radiata - should we be concerned? New Zealand J. Forestry Sci.22(1):87–95.Suche in Google Scholar
Donaldson, L.A. (1992) Within- and between-tree variation in microfibril angle in Pinus radiata. New Zealand J. Forestry Sci.22:77–86.Suche in Google Scholar
Donaldson, L.A., Lausberg, M.J.F. (1998) Comparison of conventional transmitted light and confocal microscopy for measuring wood cell dimensions by image analysis. IAWA J.19:321–336.10.1163/22941932-90001538Suche in Google Scholar
Evans, R. (1999). A variance approach to the x-ray diffractometric estimation of microfibril angle in wood. Appita J.52(4):283–289.Suche in Google Scholar
Evans, R. Ilic, J. (2001) Rapid prediction of wood stiffness from microfibril angle and density. Forest Prod. J.51(3):53–57.Suche in Google Scholar
Evans, R., Booker, R.E., Kibblewhite, R.P. (2001) Variation of microfibril angle, density and stiffness in fifty radiata pine trees. Proceedings of the 55th Appita Annual General Conference, Hobart. pp. 9–14.Suche in Google Scholar
Harris, J.M., Cown, D.J. (1991) Basic wood properties. In: Properties and Uses of New Zealand Radiata Pine. Eds. Kininmonth, J.A., Whitehouse, L.J. New Zealand Ministry of Forestry, Forest Research. p. 28.Suche in Google Scholar
Meylan, B.A. (1967) Measurement of microfibril angle by X-ray diffraction. Forest Prod. J.17 (5):51–58.Suche in Google Scholar
Meylan, B.A., Butterfield, B.G. (1978) Helical orientation of the microfibrils in tracheids, fibres and vessels. Wood Sci. Technol.12:219–222.10.1007/BF00372867Suche in Google Scholar
McConchie, D. (1999) An update on within-ring internal checking including a procedure to identify logs prone to form checks during drying. Proceedings 3rd Wood quality symposium: Emerging technologies for evaluating wood quality for processing. Forest Industries Engineering Association/Forest Research, Rotorua, New Zealand. p. 19.Suche in Google Scholar
Tsehaye, A., Buchanan, A.H., Walker, J.C.F. (1995). Stiffness and tenstile strength variation within and between radiata pine trees. Journal of the Institute of Wood Science13(5):513–518.Suche in Google Scholar
Tsehaye, A., Buchanan, A.H., Meder, R., Newman, R.H., Walker, J.C.F. (1998). Microfibril angle: determining wood stiffness in radiata pine. Proceedings International workshop on microfibril angle, Westport, New Zealand. pp. 323–336.Suche in Google Scholar
Walker, J.C.F., Butterfield, B.G. (1995) The importance of microfibril angle for the processing industries. New Zealand J. Forestry40(4):34–40.Suche in Google Scholar
Walker, J.C.F., Woollons, R.C. (1998) Cell wall organisation and the properties of xylem – A speculative review. Proceedings International workshop on microfibril angle, Westport, New Zealand. pp. 13–26.Suche in Google Scholar
Walker, J.C.F. (1998a) Corewood: docking the dog’s tail. Part 1, an alternative road map. New Zealand Forestry42(4):5–6.Suche in Google Scholar
Walker, J.C.F. (1998b) Corewood: docking the dog’s tail. Part 2, the need to particularise. New Zealand Forestry42(5):4–6.Suche in Google Scholar
Wimmer, R., Lucas, B.N., Tsui, T.Y., Oliver, W.C. (1997) Longitudinal hardness and Young’s modulus of spruce tracheid secondary walls using nanoindentation technique.Wood Sci. Technol.31:131–141.10.1007/BF00705928Suche in Google Scholar
Xu, P., Walker, J.C.F. (2004) Stiffness gradients in radiata pine trees. Wood Sci. Technol.38(1):1–9.10.1007/s00226-003-0188-2Suche in Google Scholar
Xu, P., Nakada, R., Walker, J.C.F. (1999) Optimising your processing: the right wood and the right technology. Proceedings 3rd Wood quality symposium: Emerging technologies for wood processing. Forest Industries Engineering Association/Forest Research, Rotorua, New Zealand and Melbourne, Australia. p. 12.Suche in Google Scholar
© Walter de Gruyter
Artikel in diesem Heft
- Subject Index
- Contents
- Species Index
- Author Index
- Monoethanolamine (MEA) pulping of beech and spruce wood for production of dissolving pulp
- Voltammetric analysis of the bleachability of softwood kraft pulps
- Alkaline degradation of model compounds related to beech xylan
- Effect of UV radiation on the carbonyl distribution in different pulps
- Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
- Carbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
- Ozonation of pine kraft lignin in alkaline solution. Part 1: Ozonation, characterization of kraft lignin and its ozonated preparations
- Ozonation of pine kraft lignin in alkaline solution. Part 2: Surface active properties of the ozonated kraft lignins
- Lignin reactions in oxygen delignification catalysed by Mn(II)-substituted molybdovanadophosphate polyanion
- Bioactive phenolic substances in industrially important tree species. Part 2: Knots and stemwood of fir species
- Evaluation of hydrocarbon emissions from heart- and sapwood of Scots pine using a laboratory-scale wood drier
- Effect of pulsating tension-torsion combined loading on fatigue behavior in wood
- Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
- Determination of the natural durability of larch wood (Larix decidua Mill.) from the Western Italian Alps
- High-performance liquid chromatographic analysis of soluble and total oxalate in Ca- and Mg-amended liquid cultures of three wood decay fungi
- Artificial weathering of tropical woods. Part 1: Changes in wettability and Artificial weathering of tropical woods. Part II: Color change
Artikel in diesem Heft
- Subject Index
- Contents
- Species Index
- Author Index
- Monoethanolamine (MEA) pulping of beech and spruce wood for production of dissolving pulp
- Voltammetric analysis of the bleachability of softwood kraft pulps
- Alkaline degradation of model compounds related to beech xylan
- Effect of UV radiation on the carbonyl distribution in different pulps
- Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
- Carbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
- Ozonation of pine kraft lignin in alkaline solution. Part 1: Ozonation, characterization of kraft lignin and its ozonated preparations
- Ozonation of pine kraft lignin in alkaline solution. Part 2: Surface active properties of the ozonated kraft lignins
- Lignin reactions in oxygen delignification catalysed by Mn(II)-substituted molybdovanadophosphate polyanion
- Bioactive phenolic substances in industrially important tree species. Part 2: Knots and stemwood of fir species
- Evaluation of hydrocarbon emissions from heart- and sapwood of Scots pine using a laboratory-scale wood drier
- Effect of pulsating tension-torsion combined loading on fatigue behavior in wood
- Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
- Determination of the natural durability of larch wood (Larix decidua Mill.) from the Western Italian Alps
- High-performance liquid chromatographic analysis of soluble and total oxalate in Ca- and Mg-amended liquid cultures of three wood decay fungi
- Artificial weathering of tropical woods. Part 1: Changes in wettability and Artificial weathering of tropical woods. Part II: Color change