The effect of preheating in nitrogen medium on acoustic properties of walnut and white mulberry

Dashti, Hadi; Pourtahmasi, Kambiz; Tarmian, Asghar

doi:10.22092/ijwpr.2019.126610.1548

Document Type : Research Paper

Authors

¹ PhD. Student, Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran

² Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran

³ Associate Proffesor

https://doi.org/10.22092/ijwpr.2019.126610.1548

Abstract

In this research, the effect of preheating in nitrogen medium on acoustic properties of walnut and white mulberry’s boards was studied. Sapwood boards of 300×20×20 mm with the green moisture content were prepared. Heat treatments were applied at 140 and 160 oC under pressure of 2 pascal for 30 and 60 minutes. Following the heat treatment, the samples were dried in a convectional laboratory kiln of 8% at 50 oC, relative humidity of 50%, and air velocity of 1 m/s to the average final moisture content of 8%. Using the free vibration method on free- free bar, the dynamic modulus of elasticity and damping factor were evaluated. Results revealed that the heat-treatment at 140 oC for 30 minutes did not have a significant effect on vibration properties of the wood samples. On the other hand, the heat-treatment at 160 oC caused a significant increase in dynamic modulus of elasticity and also a reduction in the damping factor of walnut and white mulberry samples. The FTIR spectroscopy and X-ray studies showed that the degradation of cell-wall polymers and increase in the crystallinity of the walnut wood specimens occurred due to heat treatment at 160 0C.

Keywords

Main Subjects

Physics and Mechanical Wood

References

Bodig, J. and Jayne, B.A., 1982. Mechanics of Wood and Wood Composites. 712 Pp.

-Boonstra, M. J.; Tjeerdsma, B. F. 2006. Chemical analysis of heat treated softwoods. Holz als Rohund Werkstoff 64(3): 204-211.

-Esteves, B., Videira, R. and Pereira, J., 2010. Chemistry and ecotoxicity of heat-treated pine wood extractions, Wood Science & technology 45(4): 661-676.

-Haines, D.W., 2000. The essential mechanical properties of wood prepared for musical instruments, CAS Journal. 4(2): 20–32.

-Harris, Ciryl M., 1998. Shock and vibration handbook (6th Edition). McGraw-Hill, New York. 1168 pp.

-ISO3129. 2012. Wood-sampling methods and general requirements for physical and mechanical testing of small clear wood specimens. International standard. Wood, sawlogs and sawn timber.

-Kubojima, Y., 1998. Vibrational properties of Sitka spruce heat-treated in nitrogen gas. Journal of Wood Science. https://doi.org/10.1007/BF00521878

-Kranitz, K., Sonderegger, W., Bues, C. and Niemz, P., 2016. Effects of aging on wood: a literature review. Wood Science Technolgy. 50(1): 7-22.

-Ma, L.N., 2005. On relationship between structure and acoustic properties of wood, Master's Thesis. Anhui Agricultural university, Hefei, China.

-Matsunaga, M., 1999. Vibrational property changes of spruce wood by impregnation with water-soluble extractives of pernambuco (Guilandina echinata Spreng.), Journal of wood science vol, 45, pp. 470-474.

-Militz, H., 2002. Thermal treament of wood. European processes and their backround. International Research Group on Wood Preservation.

-Niemz P, Hofmann T. and Re´tfalvi, T., 2010. Investigation of chemical changes in the structure of thermally modified wood. MADERAS: Ciencia y Tecnologıa 12(2):69–78.

-Noguchi, T., Obataya, E. and Ando, K., 2012. Effects of aging on the vibrational properties of wood. Journal of Cultural Heritage 13S: S21–S25.

-Ngulia Irani, G., Petrissans, M. and Gerardin, P., 2007. Chemical reactivity of heat treated wood. Wood science Technology .41(2): 157-168D.

-Roohnia, M., Doosthosseini, K., Khademieslam, H., Gril, J. and Bremaud, I., 2007. Study on variations of specific modulus of elasticity and shear moduli in arizona cypress wood. Using vibration method. Iranian Journal of Natural Resources. 59(4):921-933.

-Roohnia, M., Tajdini, A. and Manouchehri, N., 2011. Assessing wood in sounding boards considering the ratio of acoustical anisotropy. NDT and E International., 44(1): 13-20.

-Roohnia, M., Kohantorabi, M. and Tajvidi, A., 2015. Maple wood extraction for a better acoustical performance, Eur.J. wood production. 73(1), 139-142.

-Sandberg, D., Haller, P. and Navi, P., 2013. Thermo-hydro and thermo-hydro-mechanical wood processing: an opportunity for future environmentally friendly wood products. Wood Mat Sci Eng 8:64–88

-Sha, T.O., 2015. On influences of high-temperature/ ultrasonic pretreatment on the vibration properties of metasequoia glyptostroboides, Master's Thesis, Beijing Forestry University, Beijing, China.

-Se Golpayegani, A., Pourtahmasi, K., zare, S., Bremaud, I., Gril, J., Thévenon, M.F. and Masson, E., 2013. Basic acoustic properties and effect of traditional treatments.Morus alba for Tar instrument. Journal of Art Research. No 4: 71-76

-Tarmian, A. and Mastouri, A., 2019. Changes in moisture exclusion efficiency and crystallinity of thermally modified wood with aging. 12(1): 92-97. IForest. https://doi.org/10.3832/ifor2723-011

-Tjeerdsma, BF., Boonstra, M., Pizzi, A., Tekely, P. and Militz, H., 1998. Characterisation of thermally modified wood: molecular reasons for wood performance improvement. Holz Roh Werkst 56:149–153.

-Wu, Y., Sha, T., Zhao, Z., He, Z. and Yi, S., 2016. Influence of different pretreatments on the acoustic properties of dawn redwood (Metasequoia glyptostroboides Hu et Cheng). BioResources.11 (1): 2734-2743.

-Windeisen, E., Strobel, C. and Wegener, G., 2007. Chemical changes during the production of thermotreated beech wood. Wood Science and Technology 41(6): 523-536

-Yildiz, S., Gezer, ED. and Yildiz, UC., 2006. Mechanical and chemical behavior of spruce wood modified by heat. Build Environ 41:1762–1766.

-Zaman, A., Alén, R. and Kotalinen, R., 2000. Thermal behavior of Scots pine (Pinus silvestris) and silver birch (Betula pubescens) at 200-230 oC. Wood and Fiber Science, 32(2): 138-143

-Zauer, M., Kowaleswki, A., Sproßmann, R., Stonjek, H. and Wagenführ, A., 2016. Thermal modification of European beech at relatively mild temperatures for the use in electric bass guitars. Eur J Wood Prod 74:43–48.

-Zhu, L., Liu, Y. and Liu, ZH., 2016. Effect of high-temperature heat treatment on the acoustic-vibration performance of picea jezoensis. Bioresources 11(2): 4921-4934.

Iranian Journal of Wood and Paper Science Research

The effect of preheating in nitrogen medium on acoustic properties of walnut and white mulberry

References

References

Volume 34, Issue 3 - Serial Number 69
November 2019
Pages 349-360

The effect of preheating in nitrogen medium on acoustic properties of walnut and white mulberry

References

References

Volume 34, Issue 3 - Serial Number 69November 2019Pages 349-360

Volume 34, Issue 3 - Serial Number 69
November 2019
Pages 349-360