Solid wood

R. Pettersen, "The Chemical Composition of Wood," in R. Rowell, ed.. The Chemistry of Solid Wood, American Chemical Society, Washington, D.C., 1984, Chapt. 2. 

MH solid wood panels according to prEN 12775, prEN 13353 part I to 3, prEN 13017-1 and... 

The strength of a bond increases with the wood density in the region of approx. 0.7 to 0.8 g/cm Above this density, a decrease of the bond strength occurs. Performance and properties of wood-based panels are strongly influenced by the properties of the used wood. The anisotropy as well as the heterogeneity, the variability of various properties and the hygroscopicity have to be taken into account. Also the orientation of the wood fibers bonding solid wood has to be considered. 

Construction Preference should be given to solid wood, steel or steel-faced doors. Glazing should be avoided but, where necessary, should be as small as practicable ... 

State of subdivision. The smaller the pieces of a solid reactant—the smaller the state of subdivision—the faster the reaction. Wood shavings burn faster than solid wood, for example, because they have more surface area in contact with the oxygen with which they are combining (for a given mass of wood). In a sense, this is also a corollary of factor 4. 

Nishino (1991) noted the presence of an induction period in the kinetic profile of reactions of solid wood samples with acetic anhydride vapour. The duration of this induction period decreased and the rate of reaction increased with both increasing temperature and concentration of acetic anhydride vapour in the reaction vessel (Nishino, 1991). The rate of reaction was diffusion limited, with the rate of diffusion being greatest in the longitudinal direction of the wood samples. This phenomenon is only found in solid wood samples, since no induction period was noted for the reaction of wood fibres with acetic anhydride vapour (Loras, 1968). 

Titan Wood limited was formed in April 2003, by Accys Chemicals PTC, a UK-based company. The company is in the process of building a full-scale production facility for the acetylation of solid wood located at Arnhem in The Netherlands, which will become operational at the end of 2005. The company acquired equipment and intellectual property owned by the former AKBV, based in Arnhem. AKBV developed a pilot plant acetylation reactor of 2 300 litre capacity, 85 cm in diameter and 4 m long, capable of acetylating 0.9 m of solid wood per batch. 

Bongers, H.P.M. and Beckers, E.P.J. (2003). Mechanical properties of acetylated solid wood treated on pilot plant scale. In Proceedings of the First European Conference on Wood Modification, Ghent, Belgium, Van Acker, J. and Hill, C.A.S. (Eds.), pp. 341-350. 

Larsson Brelid, P. and Simonson, R. (1999). Acetylation of solid wood using microwave heating. Part 2. Experiments in laboratory scale. Holz als Roh- und Werkstoff, 57(5), 383-389. 

Militz, H., Beckers, E.P.J. and Homan, W.J. (1997). Modification of solid wood research and practical potential. International Research Group on Wood Preservation, Doc. No. IRGAVP 97 0098. 

Morozovs, A. and Aboltins, A. (1999). Acetylation of solid wood and modelling of acetic anhydride diffusion. In Proceedings of the International Scientific Colloquium, Modelling of Material Processing, Riga, Latvia, pp. 124-129. 

Rowell, R.M. (1984a). Penetration and reactivity of cell wall components. In The Chemistry of Solid Wood, Rowell, R.M. (Ed.). Advances in Chemistry Series, 207, American Chemical Society, pp. 175-210. 

Zolhfank, C. and Wegener, G. (2002). FTIR microscopy and ultrastructural investigation of sUylated solid wood. Hol orschung, 56(1), 39-42. 

Solid wood material is built up of two major organic polymers (macro molecules) (1) polysaccharides and (2) polyphenylpropane [61,62], The polysaccharides consist of two groups - cellulose and hemicellulose, and make up around 65-75 % of the wood on dry basis. The polyphenylpropanes are more commonly termed lignins and constitute around 18-35 % of the wood on dry basis. In Table 9 we can see that wood fuels consist of extractives, minerals, and nitrogen as well. The chemical composition of wood of Sweden s most commonly wood species [63], the spruce, the pine and the birch are different, see Table 9. 

Pettersen R.C., The Chemistry of Solid Wood, Ed. Roger Rowell, ACS, Seattle, Washington, March 20-25, Advances in chemistry series (ISSN 0065-2393) 207, pp. 57-126 (1983). 

Rowell, R. M. In Chemistry of Solid Wood Rowell, R. M., Ed. Advances in Chemistry Series 207 American Chemical Society Washington, DC, 1984 Chapter 4, pp 175-210. 

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