Abstract
Acoustic comfort is a basic human need. One of the adverse effects of noise is its interference with speech discrimination. Textile materials are suitable to be used as sound absorptive materials and thus help to improve acoustic comfort in rooms. Micro-fibre fabrics can be considered as better sound absorbers than regular fibre fabrics mainly due to the higher surface of its fibres and bigger contact area with the air thus, allowing greater dissipation of sound energy. In this work, the use of a microfibre woven fabric as an upstream layer is analysed considering acoustic issues. Authors demonstrate it improves the sound absorption of a polyester nonwoven, resulting in a material suitable for absorption at the sound frequencies of the human voice.
Highlights
Human beings have a need of comfort
The addition of a microfiber fabric to a layer of 15,30 or 45 mm nonwoven, being the fabric layer on the side of the sound source brings a modification of the acoustic absorption of the system fabric-nonwoven. The cause of this increase can be the formation of a Helmholtz resonator assembly. In this sort of resonators the neck is of special interest, as it is the area in which the speed of the wave is higher and the viscous effect is more important for the dissipation of the sound energy
The neck is formed by the microfiber yarns of the fabric
Summary
Human beings have a need of comfort. Acoustic comfort is a significant part of this need. Textile materials have been widely used in public places like theatres in the form of curtains, carpets and upholstery, in order to improve their sound quality. Fibrous materials need to be protected for cleaning, mechanical strength, to avoid particle shedding, or for aesthetical reasons. In these case, it is very common to cover the fibrous material using a nonwoven veil, light panel or perforated panel in different materials. It is very common to cover the fibrous material using a nonwoven veil, light panel or perforated panel in different materials This upstream layer can modify the absorption of the ensemble [4]. Micro-fibre fabrics are described as better sound absorbers than regular fibre fabrics [5] because of the higher
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