TY - JOUR
T1 - Air Permeability and Acoustic Absorbing Behavior of Nonwovens
AU - Shu Yang & Weidong Yu
JO - Journal of Fiber Bioengineering and Informatics
VL - 4
SP - 203
EP - 207
PY - 2010
DA - 2010/03
SN - 3
DO - http://doi.org/10.3993/jfbi03201103
UR - https://global-sci.org/intro/article_detail/jfbi/4969.html
KW - Nonwovens
KW - porosity
KW - permeability
KW - acoustic absorption
KW - peak shift
AB - Several nonwovens were studied to explore the relationship between their structural characteristics, permeability and acoustic 
absorbing behavior. Fundamental structural parameters including thickness, gram square meter and porosity were considered. 
Results show that the permeability is not just linear to porosity, but also related to many other complex and difficult-to-measure 
parameters. Further in this the paper we compared absorption coefficient of nonwovens with and without air permeability back, 
the sound absorption principles of those are completely different. For nonwovens with rigid back, the absorption coefficient 
increases with increasing thickness. For samples tested with air gap, the increasing air permeability moves the absorption curve 
towards lower frequency, and enhances the initial slopes of the curves. And also the absorption coefficients over the whole 
frequency range were found to increase with air permeability. This finding also indicates that the capillary effect alone cannot 
sufficiently explain the acoustic absorbing behaviour of nonwovens. Accurate theories which can illustrate sound absorption 
property of nonwovens still need to be improved and more precise model is still to be developed to explain the acoustic absorbing 
behaviour of nonwovens.