Comparison of the sound absorption properties of acoustic absorbers made from used copy paper and corrugated board

Due to the increasing demand for eco-friendly, inexpensive sound absorbers, this study investigated composites made from recycled paper pulp and urea-formaldehyde adhesive. By varying contents, five samples used copy corrugated board were fabricated. For same type of porous absorber, one with a lower bulk density has higher total porosity, resulting in absorption coefficient (SAC) spectrum. Sound-absorbing performance densities below 442.4 kg/m3 less than 474.8 can be alternatives commercial polyurethane foam thickness. The noise reduction (NRC), as well average SAC all at medium (αM) high (αH) frequencies greater those composites. However, low frequency (αL) was not explicitly different In conclusion, are better candidate absorbers content.