A novel sound absorber with recycled fibers coming from end of life tires (ELTs)

Maderuelo-Sanz, Rubén; Nadal-Gisbert, A.; Amorós, José Enrique Crespo; Parrés, F.

doi:10.1016/j.apacoust.2011.12.001

Cited by 84 publications

(53 citation statements)

References 26 publications

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“…In the case of composites, the values of sound absorption coefficients are small for low frequencies and usually they increase with increasing frequency. Nowadays, more and more one tends to obtain new sound absorbing materials with appropriately good properties of sound absorption, high stability and resistance to various factors, and with proper form and surface quality, as well as the price being attractive [2,14,15]. A promising solution, in respect of both economy and acoustic properties of the material obtained, would be the use of waste fibres, especially environmentally friendly ones [15][16][17][18][19].…”

Section: Methodsmentioning

confidence: 99%

Sound absorption property of nonwoven based composites

Gliścińska¹,

Michalak²,

Krucińska³

2013

Autex Research Journal

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Sound absorbing materials used to provide optimal conditions in rooms can be applied in the form of textiles with a special structure such as nonwovens or fibre-containing composites. Nonwovens can be successfully used to make thermoplastic composites by thermal pressing. This paper presents the comparison of the sound absorbing properties of needled nonwovens and composites made from them. Composites with various densities can be made of nonwovens with various percentage contents of filling and matrix fibres. The sound absorption by composites with similar thickness, about several millimetres, is slightly lower than that by the laminar nonwoven packs used for their making. The optimal content of the filling fibres in the composite, when its sound absorption coefficient reaches the highest values, is at the level of 10 wt.%. With the increase in the content of filling fibres the composite density decreases. In the case of the composite with 10 wt.% of filling fibres, its density is the highest among the composites investigated, and the increase in absorption of high-frequency sounds is the highest. Imparting a relief with a protrusion diameter over 10 mm to the composite surface, we can increase the sound absorption of that composite.

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Section: Methodsmentioning

confidence: 99%

Sound absorption property of nonwoven based composites

Gliścińska¹,

Michalak²,

Krucińska³

2013

Autex Research Journal

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“…Therefore, a good absorbing material absorbs the energy of the sound waves and less heat is generated. However, in composites, the compaction of the bark cloth non-woven felt results in reduced porosity, thus increasing flow resistivity and reduced vibration of the fibre network, therefore a reduced sound absorption coefficient [28].…”

Section: Acoustic Propertiesmentioning

confidence: 99%

Investigation Of Sound Absorption Properties Of Bark Cloth Nonwoven Fabric And Composites

Rwawiire

Tomková

Gliścińska

et al. 2015

Autex Research Journal

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The quest for sound-absorbing materials that are not only environmentally friendly, but also sustainable is the foremost reason for natural fibre-acoustic materials. Bark cloth is a natural non-woven fabric that is largely produced from Ficus trees. An exploratory investigation of bark cloth a non-woven material and its reinforcement in epoxy polymer composites has been fabricated and investigated for the sound absorption properties so as to find the most suitable applications and also to see whether bark cloth can be used in some applications in place of man-made fibres. Three types of material species were investigated with their respective composites. The fibre morphology showed bark cloth to be a porous fabric that showed promising sound absorption properties at higher frequencies. The sound absorption results of four-layer material selections of Ficus natalensis, Ficus brachypoda and Antiaris toxicaria bark cloth showed sound absorption coefficient of 0.7; 0.71 and 0.91 at f > 6400 Hz, respectively. The bark cloth reinforced laminar epoxy composites had reduced sound absorption coefficients, which ranged from 0.1 to 0.35, which was attributed to decreased porosity and vibration in the bark cloth fibre network.

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“…Several examples of recycled materials can be found in Del Rey et al (3) with plastic bottle recycling, in Maderuelo et al (4) with tyre recycling, or in Del Rey et al (5) with recycled foams. Other examples of natural based materials can be found in Fatima and Mohanty (6) with jute, in Ramis et al (7) with kenaf, in Ramis et al (8) with coconut, in Diaz et al (9) with reed, in Arenas et al (10) with cellulose, or in Bulent et al (11) with tea fibres.…”

Section: Introductionmentioning

confidence: 99%

Small-sized reverberation chamber for the measurement of sound absorption

et al. 2017

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This paper presents the design, construction, calibration and automation of a reverberation chamber for small samples. A balance has been sought between reducing sample size, to reduce the manufacturing costs of materials, and finding the appropriate volume of the chamber, to obtain reliable values at high and mid frequencies. The small-sized reverberation chamber, that was built, has a volume of 1.12 m 3 and allows for the testing of samples of 0.3 m 2 . By using diffusers, to improve the diffusion degree, and automating measurements, we were able to improve the reliability of the results, thus reducing test errors. Several comparison studies of the measurements of the small-sized reverberation chamber and the standardised reverberation chamber are shown, and a good degree of adjustment can be seen between them, within the range of valid frequencies. This paper presents a small laboratory for comparing samples and making decisions before the manufacturing of larger sizes. RESUMEN: Cámara reverberante de tamaño reducido para medidas de la absorción sonora. En este trabajo se muestra el diseño, construcción, calibración y automatización de una cámara reverberante para pequeñas muestras. Se ha buscado un equilibro entre la reducción de tamaño de las muestras para disminuir los costes de fabricación de materiales, y el volumen adecuado que permita obtener valores fiables a determinadas frecuencias. La cámara reverberante construida tiene 1.12 m 3 de volumen y permite la medida de muestras de 0.3 m 2 . La colocación de difusores para aumentar el grado de difusión, y la automatización de las medidas, disminuyen los errores de ensayo. Se muestran también diferentes campañas comparativas de medidas en la cámara reverberante para pequeñas muestras y en la cámara normalizada. Puede verse un buen grado de ajuste entre ambas dentro del rango de frecuencias válido. Por tanto, se muestra un pequeño laboratorio que permite comparar muestras y tomar decisiones, antes de realizar la fabricación de grandes tamaños.PALABRAS CLAVE: Propiedades Acústicas; Coeficiente de Absorción Sonora; Caracterización.ORCID ID: R. del Rey

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A novel sound absorber with recycled fibers coming from end of life tires (ELTs)

Cited by 84 publications

References 26 publications

Sound absorption property of nonwoven based composites

Sound absorption property of nonwoven based composites

Investigation Of Sound Absorption Properties Of Bark Cloth Nonwoven Fabric And Composites

Small-sized reverberation chamber for the measurement of sound absorption

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