An investigation into sound transmission loss by polypropylene needle-punched nonwovens

Ghorbani, Kazem; Hasani, Hossein; Zarrebini, Mohammad; Saghafi, Reza

doi:10.1016/j.aej.2016.02.012

Cited by 23 publications

(13 citation statements)

References 9 publications

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“…As the thickness increases, the sound absorption performance is increased as well. This is similar with previous research results [7,11] whereby the sample thickness increasing the porosity and mass density. This, in turn, makes more absorption of sound energy.…”

Section: Methodssupporting

confidence: 83%

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Improved Sound Absorption Performance of Nonwoven Fabric using Fabric Facing and Air Back Cavity

et al. 2017

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Abstract. This paper presents the improvement methods to increase sound absorption performance of polyethylene based nonwoven fabric (PNF). The methods are placing a woven fabric in front of the sample as well as providing air cavity behind the sample. The samples were experimentally tested in an impedance tube based on ISO 10354-2:2001 whereby two microphones are used and the transfer matrix methods are employed. From the results, it can be seen that placing front woven fabric effectively increases sound absorption performance. Moreover, introducing air cavity gap behind the sample is also found to be more significant to increase sound absorption.

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Section: Methodssupporting

confidence: 83%

“…It is found that the most influential factor to increase insulation is the web mass. By increasing the mass, the sound insulation performance is improved significantly [11].…”

Section: Introductionmentioning

confidence: 99%

Improved Sound Absorption Performance of Nonwoven Fabric using Fabric Facing and Air Back Cavity

et al. 2017

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“…STL represents the amount of sound, in decibels (dB) that is isolated by a material or partition in a particular octave band . The higher the transmission loss, the less the sound waves pass through the specimen.…”

Section: Methodsmentioning

confidence: 99%

An Optimization Study on Sound Insulation Property of Ethylene Vinyl Acetate/Hematite Coated Nonwovens

2018

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In this study, nonwoven fabrics were coated with ethylene vinyl acetate/hematite blends. Three different hematite loadings (100, 300, and 600 g/m2) were applied. After evaluations of morphology, thermal stability, and mechanical properties of the coated structures, sound insulation property was investigated. In addition, a detailed statistical analysis was performed on sound transmission loss. It was found that sound insulation property changed depending on the frequency and hematite loading amount. A hematite loading amount of 160–190 g/m2 can be used together with ethylene vinyl acetate as the matrix polymer for enhanced thermal and sound insulation properties without compromising mechanical performance. POLYM. COMPOS., 40:1890–1896, 2019. © 2018 Society of Plastics Engineers

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“…their sound absorption and insulation properties. Previous studies investigated especially the effect of fiber denier and/or fiber cross section, areal density (gsm), air permeability and production machine parameters/production methods on acoustic performance [8][9][10][11]. There have been reports relating to the indluences of fiber denier, fiber shape and fabric density on compression molded vertically lapped fabrics.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Behaviour of Nonwovens

Gokarneshan

2020

JTSFT

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Influence of Fibre Cross Section and Various Bonding Techniques Adopting TaguchiOwing to their high porosity and low solid volume fraction nonwoven materials are considered to be the most appropriate textile based sound absorbers for noise control applications. The solid volume fraction in majority of nonwovens could be 20% or less. The structure of nonwovens inherently has pores with tortuous paths, allowing the sound waves to enter through them. Various kinds of pores like 'open' or 'closed' can be present in a porous material [6]. 'Open' pored materials have a continuous channel of communication with the external surface of the body.The open-pored structure of nonwovens provides a proper medium for sound waves to be absorbed by three mechanisms which are: converting the sound energy into heat in the material, viscous losses because of the oscillating air flow entering the porous areas inside the material and vibration of fibers due to vibration of air particles caused by the sound waves [7]. Since nonwoven materials have a complex structure, there are many variables influencing

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An investigation into sound transmission loss by polypropylene needle-punched nonwovens

Cited by 23 publications

References 9 publications

Improved Sound Absorption Performance of Nonwoven Fabric using Fabric Facing and Air Back Cavity

Improved Sound Absorption Performance of Nonwoven Fabric using Fabric Facing and Air Back Cavity

An Optimization Study on Sound Insulation Property of Ethylene Vinyl Acetate/Hematite Coated Nonwovens

Acoustic Behaviour of Nonwovens

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