| abstract |
An object of the present invention is to provide a porous sound-absorbing material with improved sound-absorbing performance without changing the thickness of the base material at an appropriate cost. In particular, the sound-absorbing characteristics of foamed sound-absorbing materials such as flexible urethane foam are provided. It makes a big contribution to improvement. A heat-bonding sheet is set on at least a sound wave incident surface of a fiber-based sound-absorbing base material or a foam-based sound-absorbing base material, and the heat-bonding sheet is melted by heating to form a fiber surface or a foam skeleton of the base material. A porous sound-absorbing material with improved sound-absorbing performance, characterized in that it is melted to form a film-like fused state on the base material. DESCRIPTION OF SYMBOLS 1 ... Sound absorption base material, 2 ... Heat-fusion sheet | seat, 2a ... Film after the fusion | melting of a heat-fusion sheet | seat. [Selection] Figure 1 |