Abstract: The present invention provides a membranous-vibration sound absorbing material which can achieve not only good sound absorbing characteristics, workability and strength but also transparency. The membranous-vibration sound absorbing material can also achieve dust-proof and dust-free properties when necessary and can be suitably used for application in clean rooms and the like.

Abstract: The improved sound absorbing material comprises an aluminum base expanded metal (or an aluminum base metal screen) which is laminated with an aluminum base metal foil (or a thin resin film), or additionally with an aluminum base metal fiber layer. The aluminum base metal foil (or thin resin film) has ruptures, which vibrate in the process of sound absorption to permit the sound absorbing material to exhibit excellent sound-absorbing characteristics over a broad frequency range. The improved sound absorbing material can be produced by a process which comprises the steps of preparing a laminate comprising the members described above and pressing the laminate so that the individual members are compressed together while forming ruptures in a regular pattern in the aluminum base metal foil (or thin resin film).

Abstract: A porous metallic material of the present invention is constructed of a laminate consisting of an expanded metal and a fibrous metallic fiber both of which are pressed to be joined to each other under pressure. This porous metallic material is excellent in bending strength and workability. The porous metallic material may be laminated to a honeycomb structural element and a rigid plate so as to form a porous structural material. To this porous metallic material may be also laminated a decorative layer so as to form a porous decorative sound absorbing material. The present invention provides the above-mentioned products and method for manufacturing the same.

Abstract: A porous metallic material of the present invention is constructed of a laminate consisting of an expanded metal and a fibrous metallic fiber both of which are pressed to be joined to each other under pressure. This porous metallic material is excellent in bending strength and workability. The porous metallic materials may be laminated to a honeycomb structural element and a rigid plate so as to form a porous structural material. To this porous metallic material may be also laminated a decorative layer so as to form a porous decorative sound absorbing material. The present invention provides the above-mentioned products and method for manufacturing the same.