SOUND ABSORBING MATERIAL MULTILAYER SOUND ABSORBING MATERIAL MOLDED PRODUCT OF MULTILAYER SOUND ABSORBING MATERIAL SOUND ABSORBING INTERIOR MATERIAL AND SOUND ABSORBING FLOOR COVERING MATERIAL

摘要

An object of the present invention is lightweight and also to provide an excellent sound-absorbing material is absorbing properties There being. A fiber sheet made of a porous fiber having a large number of pores in the porous fiber comprising at least 50% by weight or more on the surface, the air flow resistance and provides a sound-absorbing material 0.05~3.0 s / m. Porous fibers having many pores which pores on the surface and air permeability and sound absorption in the fiber itself, such air-permeable sheet made of a porous fiber having a sound absorption is by the space formed between fibers because the sound absorption is exhibited absorption effect is very large absorption The materials.