Acoustic Properties of Larch Bark Panels

Tudor, Eugenia Mariana; Krišťák, Ľuboš; Barbu, Marius Cătălin; Gergeľ, Tomáš; Němec, Miroslav; Kain, Günther; Réh, Roman

doi:10.3390/f12070887

Cited by 19 publications

(10 citation statements)

References 71 publications

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“…The porous sound-absorbing material uses the principle that sound energy is converted into heat energy, as sound waves vibrate as they strike the pores. Since it is easy to dissipate energy in the pores with many continuous channels, the sound absorption performance is superior [12,13]. Additionally, the lower density and higher porosity allow sound to enter into the material more easily, which can contribute to greater sound absorption [12].…”

Section: Introductionmentioning

confidence: 99%

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Delignification Effects on Indonesian Momala (Homalium foetidum) and Korean Red Toon (Toona sinensis) Hardwood Pore Structure and Sound Absorption Capabilities

Jang

Kang

2021

Materials

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Among the various methods used to improve the sound absorption capability of wood, we focused on delignification in Indonesian momala (Homalium foetidum) and Korean red toon (Toona sinensis). We performed gas permeability, pore size, and porosity analyses and evaluated how the change in the pore structure affects the sound absorption capabilities. Results show that delignification increased the through-pore porosity and improved sound absorption capability in both species. In addition, the air gap in the rear space maximized the sound absorption of momala and the red toon. The noise reduction coefficient (NRC) of delignified momala (90 min) with a 3 cm air gap was 0.359 ± 0.023. This is approximately 154.6% higher than that of untreated momala without an air gap. The NRC of delignificated red toon (90 min) with a 3 cm air gap was 0.324 ± 0.040, an increase of 604.3% over untreated red toon without an air gap.

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Section: Introductionmentioning

confidence: 99%

“…Since it is easy to dissipate energy in the pores with many continuous channels, the sound absorption performance is superior [12,13]. Additionally, the lower density and higher porosity allow sound to enter into the material more easily, which can contribute to greater sound absorption [12].…”

Section: Introductionmentioning

confidence: 99%

Delignification Effects on Indonesian Momala (Homalium foetidum) and Korean Red Toon (Toona sinensis) Hardwood Pore Structure and Sound Absorption Capabilities

Jang

Kang

2021

Materials

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“…Assuming an average bark content of 10%, around 150-180 × 10 6 m 3 bark is produced annually by industrial wood logs [19]. Except for energy generation, tree bark can be used as thermal insulating [22][23][24] and sound absorbing material [25,26] as fire-retardant panels [27], as single-layer [28,29] or 3-layers particleboard [30], medium density fibreboards [31] and oriented strand boards [32,33].…”

Section: Introductionmentioning

confidence: 99%

Selected Properties of Cement Bound Spruce and Larch Bark Bio-Aggregates

et al. 2021

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The aim of this study is to investigate the suitability of spruce and larch bark for the production of cement-bonded composites. At the beginning of this research, the curing behaviour of the admixtures was quantified with temperature profiles when testing spruce, larch, pine and poplar bark, to determine the compatibility between the components of the bio-aggregates, to analyse the cement curing and to establish which bark species should be successfully included in cement bonded composites. Considering the results, it was observed that the average densities of 600–700 kg/m3 of bio-aggregates are 40–55% lower than that of established products on the market, although spruce and larch bark are in a similar range. The situation is different for the compressive strength, as larch bark showed up to 30% higher values than spruce bark. This study revealed also different hardening characteristics of the two cement types used as binders for spruce and larch bark. The results of this study demonstrated that tree bark of Picea abies and Larix decidua Mill. can be successfully utilized for the production of a cement-bonded composite material.

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“…The physicomechanical properties of particleboards, except their technological parameters, depend significantly on the characteristics of the raw materials used in their production [ 1 ]. These are the type and amount of the adhesive system used for their bonding, the type of the raw material, its degree of fragmentation and geometry (size and shape), and moisture content [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. The right choice of the moisture content of the particles, independently of their fineness degree, is also necessary for assuring the correct industrial process of particleboards.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Wood Particles Used in the Particleboard Production as a Function of Their Moisture Content

et al. 2021

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The properties of particleboards and the course of their manufacturing process depend on the characteristics of wood particles, their degree of fineness, geometry, and moisture content. This research work aims to investigate the physical properties of wood particles used in the particleboard production in dependence on their moisture content. Two types of particles currently used in the production of three-layer particleboards, i.e., microparticles (MP) for the outer layers of particleboards and particles for the core layers (PCL), were used in the study. The particles with a moisture content of 0.55%, 3.5%, 7%, 10%, 15%, and 20% were tested for their poured bulk density (ρp), tapped bulk density (ρt), compression ratio (k), angle of repose (αR), and slippery angle of repose (αs). It was found that irrespective of the fineness of the particles, an increase in their moisture content caused an increase in the angle of repose and slippery angle of repose and an increase in poured and tapped bulk density, while for PCL, the biggest changes in bulk density occurred in the range up to 15% of moisture content, and for MP in the range above 7% of moisture content, respectively. An increase in the moisture content of PCL in the range studied results in a significant increase in the compression ratio from 47.1% to 66.7%. The compression ratio of MP increases only up to 15% of their moisture content—a change of value from 47.1% to 58.7%.

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Acoustic Properties of Larch Bark Panels

Cited by 19 publications

References 71 publications

Delignification Effects on Indonesian Momala (Homalium foetidum) and Korean Red Toon (Toona sinensis) Hardwood Pore Structure and Sound Absorption Capabilities

Delignification Effects on Indonesian Momala (Homalium foetidum) and Korean Red Toon (Toona sinensis) Hardwood Pore Structure and Sound Absorption Capabilities

Selected Properties of Cement Bound Spruce and Larch Bark Bio-Aggregates

Characterisation of Wood Particles Used in the Particleboard Production as a Function of Their Moisture Content

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