The effect of chemical treatment and compression percent on mechanical properties of Paulownia compressed wood

Document Type : Research Paper

Authors

Abstract

Since human creation up to now, wood has been discussed as an important organic material, therefore its maintain and optimum usage is a considerable problem. From one hand, with due attention to condition of forest in Iran, using fast growing specie Paulownia provides new way in wood industries. But from other hand, this specie with low density has low strength. One of the suggested ways to increase density of this wood is its impregnation by resin and to compress it. In this research it is tried to increase the penetrability and impregnation of Paulownia by using urea formaldehyde resin at first pretreatment and then compression should be done. In order to perform this process, two variables pretreatment and compression percent were defined that each of them had two levels. The pretreatment was performed by NaCl and NaOH and 40, 50% compression. Totally, 72 samples were prepared and after producing the compressed wood, the absorption percent and mechanical properties were evaluated which included compression parallel to grain, modulus of rupture, modulus of elasticity in bending and impact strength. The results showed that the provided mechanical properties and pretreatments samples with NaCl had most values of these properties in 40 and 50% compression levels.

Keywords

References

[1]     Sadatnejad, S.H., Tajvidi, M. and Yosefi, H., 2008. Effect of longitudinal compression to bulk cell wall on mechanical properties of steamed treated of beach wood. Iranian Journal of Wood and Paper Science Research, 23(2): 191-199. (In Persian)
[2]     Omidvar, A., 2009. Textbook of Wood-polymer composite, Gorgan University of Agricultural Sciences and Natural Resources Publication, Gorgan, 120 p. (In Persian)
[3]     Sekalu, M. and Khazaeian, A., 2012. The effect of chemical modification with phenol formaldehyde and compression on mechanical properties of Paulownia Wood. Iranian Journal of Wood and Paper Science Research, 3(1): 13-28. (In Persian)
[4]     Edalat, H.R., Tabarsa, T. and Reisi, M., 2008. Densification of Paulownia wood by using of hot-press. Iranian Journal of Wood and Paper Science Research, 23(2): 136-148. (In Persian)
[5]     Kollman, F.P., Kuenzi, E.W. and Stamm, A.J., 1975. Principle of wood science and Technology, Vol. 2, Wood based materials.1st Ed., Springer-verlag, New York, Heidelerg, Berlin, 703 p.
[6]     Yuhe, Ch., and Muehl, J.H., 1999. Factors of affecting the spring back of compressed Paulownia wood. Journal of Forestry research, 10(3): 168-172.
[7]     Mohammadi, M., Tabarsa, T. and Tasooji, M., 2011. Effect of static densification of treated paulownia wood on relationship between strength and density. Iranian Journal of Wood and Paper Science Research, 26(3): 592-604. (In Persian)
[8]     Bodig, J. and Jayne, BA., 1982. Mechanics of Wood and Wood Composites. Van Nostrand Reynold Compony, New York. ISBN 442008228.
[9]     Shams, M.D., and Yano, H., 2009. A new method for obtaining high strength PF resin impregnated wood composites at low pressing pressure. Journal of tropical forest science, 21(2): 175-180.
 
Iranian Journal of Wood and Paper Industries
Volume 5, Issue 2 - Serial Number 2
November 2014
Pages 59-70

Files

Share

How to cite

Statistics