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      Sound-Absorption Coefficient of Bark-Based Insulation Panels

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          Abstract

          The objective of this study was to investigate the sound absorption coefficient of bark-based insulation panels made of softwood barks Spruce ( Picea abies (L.) H. Karst.) and Larch ( Larix decidua Mill.) by means of impedance tube, with a frequency range between 125 and 4000 Hz. The highest efficiency of sound absorption was recorded for spruce bark-based insulation boards bonded with urea-formaldehyde resin, at a level of 1000 and 2000 Hz. The potential of noise reduction of larch bark-based panels glued with tannin-based adhesive covers the same frequency interval. The experimental results show that softwood bark, an underrated material, can substitute expensive materials that involve more grey energy in sound insulation applications. Compared with wood-based composites, the engineered spruce bark (with coarse-grained and fine-grained particles) can absorb the sound even better than MDF, particleboard or OSB. Therefore, the sound absorption coefficient values strengthen the application of insulation panels based on tree bark as structural elements for the noise reduction in residential buildings, and concurrently they open the new ways for a deeper research in this field.

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          Porous materials for sound absorption

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            Recent trends in porous sound-absorbing materials

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              Rice straw–wood particle composite for sound absorbing wooden construction materials

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                Author and article information

                Journal
                Polymers (Basel)
                Polymers (Basel)
                polymers
                Polymers
                MDPI
                2073-4360
                29 April 2020
                May 2020
                : 12
                : 5
                Affiliations
                [1 ]Forest Products Technology and Timber Construction Department, Salzburg University of Applied Sciences, Markt 136a, 5431 Kuchl, Austria
                [2 ]Faculty of Wood Engineering, Transilvania University of Brasov, Bld. Eroilor nr.29, 500036 Brasov, Romania
                [3 ]Steelcase, Brienner Str. 42, 80333 München, Germany
                [4 ]Faculty of Wood Sciences and Technology, Technical University in Zvolen, T. G. Masaryka 24, SK-960 01 Zvolen, Slovakia
                Author notes
                [* ]Correspondence: kristak@ 123456tuzvo.sk
                Article
                polymers-12-01012
                10.3390/polym12051012
                7285063
                32365459
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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