Acoustic Properties of Multi-Layer Wool Nonwoven Structures

Broda, Jan; Bączek, Marcin

doi:10.1080/15440478.2019.1584078

Cited by 29 publications

(15 citation statements)

References 32 publications

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“…Therefore, as discussed, all the fabricated WNM except 790 GSM were fabricated with higher thickness and lower area density than CEL/PET, which showed optimum results. The result also can be compared with the Broda and Bączek’s [ 26 ] work, when the nonwoven wool with higher area density (~920 GSM) showed lower NRC (0.37) than our fabricated 790 GSM with significantly higher NRC (0.43).…”

Section: Resultssupporting

confidence: 57%

“…In the frequency range from 108 to 4091 Hz, the sound absorption coefficient of the WNM increased with the increase of the area density. As mentioned earlier, the area density of the WNM refers to the number of fibres in a certain area, and higher area density indicates the presence of higher proportion of fibres in a specific area, which induces more resistance to the sound wave [ 26 , 45 ] and contributes to the higher sound absorption tendency [ 46 , 47 , 48 ]. As shown in Figure 8 c, the WNM with an area density of 790 GSM showed the highest NRC (0.43), significantly different ( p < 0.05) from the other WNM and the commercial materials (PET and CEL/PET).…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the sound absorption coefficient decreased with the increment in fibre diameter, but the wool acoustical property did not strongly rely on the flow resistivity. In another work, Broda and Bączek [ 26 ] investigated the influence of a multilayer structure on wool nonwovens on the sound absorption and found that the multilayer structure improved their sound insulating properties at a low number of layers.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Lightweight Insulation Materials from Textile-Based Waste for the Automobile Industry

et al. 2021

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Globally, automotive manufacturers are looking for ways to produce environmentally sustainable and recyclable materials for automobiles to meet new regulations and customer desires. To enable the needs for rapid response, this study investigated the feasibility of using waste and virgin wool fibres as cost-effective and sustainable alternatives for automotive sound and heat insulation using a chemical-free approach. Several properties of the currently available commercial automotive insulators were investigated in order to facilitate the designing of green wool-based needle-punched nonwoven materials. The effect of fibre diameter, nonwoven surface, layer structure, thickness, and area density on sound absorption and thermal resistance was investigated. The results suggested that the wool nonwoven materials, fabricated using waste and virgin wool fibres, possessed extremely efficient acoustic and thermal insulating properties comparable with the currently used commercial synthetic insulating materials. Besides, the wool nonwoven materials showed identical antibacterial and antifungal properties with a greater biodegradation rate (50%) than that of the commercial synthetic insulating materials. Hence, this study showed that natural wool fibres have the potential to be used as green, lightweight, and sustainable materials in the automobiles, while they qualify for Reuse–Recycle and Reuse–Recover purposes at the end-of-life of vehicles.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sustainable Lightweight Insulation Materials from Textile-Based Waste for the Automobile Industry

et al. 2021

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“…Moreover, the noise absorption coefficient is found to increase with increasing weight fraction of chicken feather fiber reinforced in composites. [ 59 ] Broda and Bączek [ 60 ] studied the sound absorption behavior of wool insulating materials developed using nonwoven technique and concluded that the sound absorption grows due to reduction in their air permeability caused by increasing nonwoven thickness. Additionally, the studies investigating the sound absorption properties of Calotropis procera (Apple of Sodom) fibers [ 61 ] and broom fibers [ 62 ] have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Multiphysical theoretical prediction and experimental verification of vibroacoustic responses of fruit fiber‐reinforced polymeric composite

2020

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The acoustic parameters (sound power level and radiation efficiency) of harmonically excited natural fiber (Luffa cylindrica) reinforced polymer composite panel is predicted first time using a coupled finite and boundary element scheme including the mechanical characteristics. First, the frequency values of the freely vibrating Luffa fiber-reinforced composite are obtained through a finite element solution considering the higher-order polynomial kinematic theory to count the structural deformation. Further, the Helmholtz wave equation is solved to evaluate the acoustic data under the harmonic excitation. The proposed multiphysics model is taking care of the structure, the fluid medium and the coupling between them, which, in turn, allows to obtain the solution numerically for the final finished polymer composite product. Further, the model accuracy has been shown by comparing both frequency and sound radiation responses with available published results including the own experimental values. Moreover, the fruit extracted fiber reinforced polymer composite plate components are fabricated using different volume fractions of fiber content and utilized for the numerical analysis considering their experimental properties (mechanical and physical). Finally, the influences of the dimensional variable (aspect ratio, side to thickness ratio and support condition) on the acoustic radiation behavior of the fabricated composite have been examined thoroughly to show their possible real-life applications.

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“…In the recent years, apart from the traditional products available on the market, new wool technical textiles appeared [1,2]. Among them the most popular are acoustic and thermal materials used in the construction industry for insulation of pitched roofs, walls and ceilings [3][4][5][6][7][8]. For commercial application, also wool oil sorbents [9,10], heavy metal-absorbing materials [11,12] and geotextiles [13] are used.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Sheep Wool Geotextiles Designed for Erosion Control

Broda¹

2019

Environmental Chemistry and Recent Pollution Control Approaches

Self Cite

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Wool geotextiles were formed from the meandrically arranged thick ropes and used as erosion control products. The geotextiles were installed in the experimental sites to protect the endangered slopes and the bank of ditches. Additionally, as a reinforcement of the soil, loose wool fibres were applied. The progress of wool biodegradation on the slope was investigated. Changes in the outer appearance, mechanical parameters, molecular structure and fibre morphology were analysed. Moreover, the nitrogen content in the soil and the effect of compounds released into soil on the grass growth were studied. The measurements revealed that the biodegradation starts at the cleavage of disulphide bonds, followed by disruption of the peptide bonds. Degradation is initiated in the outer cuticle and is followed by the decomposition of the inner cortical cells. During biodegradation, the nitrogen-rich compounds are released. The compounds act as an effective fertiliser which supports the growth of grass and significantly accelerates the greening of the slope.

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Acoustic Properties of Multi-Layer Wool Nonwoven Structures

Cited by 29 publications

References 32 publications

Sustainable Lightweight Insulation Materials from Textile-Based Waste for the Automobile Industry

Sustainable Lightweight Insulation Materials from Textile-Based Waste for the Automobile Industry

Multiphysical theoretical prediction and experimental verification of vibroacoustic responses of fruit fiber‐reinforced polymeric composite

Biodegradation of Sheep Wool Geotextiles Designed for Erosion Control

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