Please use this identifier to cite or link to this item: http://hdl.handle.net/11452/29274
Title: Sound absorption analysis of thermally bonded high-loft nonwovens
Authors: Pourdeyhimi, Behnam
Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.
0000-0001-5708-7993
Süvari, Fatih
Ulcay, Yusuf
N-1770-2019
55512827100
6601918936
Keywords: Materials science
Sound
Absorption
Nonwoven
Acoustic
High-loft
Air velocity
Parameters
Fabrics
Acoustic impedance
Acoustic waves
Acoustics
Air
Buildings
Nonwoven fabrics
Polyesters
Polypropylenes
Sound insulating materials
Velocity
Air velocities
High lofts
Maximum velocity
Minimum thickness
Non-woven
Sound absorption characteristic
Sound absorption coefficients
Specially designed mold
Acoustic wave absorption
Issue Date: May-2016
Publisher: Sage Publications
Citation: Süvari, F. vd. (2016). "Sound absorption analysis of thermally bonded high-loft nonwovens". Textile Research Journal, 86(8), 837-847.
Abstract: Sound absorption characteristics of specially designed high-loft nonwovens with minimum thickness were reported in this study. Three different polypropylene and polyester fiber-based high-loft, air-laid, and thermally bonded nonwovens varying in basis weight were produced. Heavier high-loft nonwoven samples at various thicknesses were formed using a specially designed mold. The sound absorption coefficients of samples with mass per unit areas ranging from 350 to 1575 g/m(2) and with thicknesses ranging from 5 to 45 mm were measured. Acoustical absorptive behavior of the high-loft nonwovens was explained by analyzing the displacements of small air control volumes in a high-loft nonwoven and the air velocities in the impedance tube. Results indicate that the velocity and the total displacement of the small air volumes inside the fiber network have a major effect on sound absorption. High-loft nonwovens can be much more effective in terms of sound absorption if they are produced at the thickness at which average maximum velocity of the air is calculated highest. If there is a desire to absorb more acoustic energy, heavier nonwovens can be produced. It is suggested that relatively heavy nonwovens (from 700 to 1575g/m(2)) can be produced thinner (5-10 mm) than the calculated thickness value based on the average maximum air velocity to get maximum sound absorption at lower thickness.
URI: https://doi.org/10.1177/0040517515590412
https://journals.sagepub.com/doi/10.1177/0040517515590412
http://hdl.handle.net/11452/29274
ISSN: 0040-5175
Appears in Collections:Scopus
Web of Science

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