Correlation between Gas and Liquid Permeability with Noise Reduction Coefficient in Insulation Boards Made from Sugar Cane Bagasse

1 Shahid Rajaee Teacher Training University, Faculty of Civil Engineering, Wood Science and Technology Department, 2122970021 Iran
2 University of Tehran, Faculty of Natural Resources, Wood and Paper Sciences and Technologies Department, 2632249311 Iran
3 Linnaeus University, Department of Forestry and Wood Technology, Luckligs plats 1, 351 95 Vaxjo, Sweden
4 Georg August University Gottingen, Burckhardt Institute, Department of Wood Biology and Wood Products, Busgenweg 4, 37077 Gottingen, Germany


Taghiyari, H. R., A. Elyasi, K. Doost-Hoseini and Reza Hosseinpourpia, 2017. Correlation between gas and liquid permeability with noise reduction coeffi cient in insulation boards made from sugar cane bagasse. Bulg. J. Agric. Sci., 23 (3): 674–681

Specifi c gas and liquid permeability, as well as noise reduction coeffi cients, in insulating boards made of sugar-cane bagasse were studied here. Urea-formaldehyde (UF) and melamine-urea-formaldehyde (MUF) were used to produce homogeneous as well as three-layered insulating boards with three densities of 0.3, 0.4, and 0.5 g/cm3. The obtained results indicated that MUF slightly decreased gas and liquid permeability, but it did not signifi cantly affect the noise reduction coeffi cients. Gas and liquid permeability were considerably affected by the density of the boards, due to the compression between the bagasse particles and less spaces and voids to let the fl uids to pass through. However, noise reduction coeffi cients were signifi cantly affected both by the density, as well as the board-type. More compression between the particles and the consequent less space between the bagasse particles entangled the waves; furthermore, the sudden change between the layers in the three-layered boards formed a barrier towards transmission of waves.

Key words: bagasse; insulation board; noise reduction coeffi cient (NRC); permeability; sound absorption; sugarcane

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