Sound-absorbing material, multi-layer sound-absorbing material, multi-layer sound-absorbing material molded product, sound absorption bedding material and sound absorbing interior materials

摘要

The object of the present invention is to provide a sound absorbing material having excellent sound absorbing properties and light weight. A fibrous sheet comprising fibers containing at least 50% by weight of a porous fiber having a large number of pores opened in the surface to provide a sound absorbing material is 0.05~3.0kPa · s / m ventilation resistance . The porous fiber having a large number of pores opened in the surface, air permeability and has a sound absorbing properties to the fibers themselves, sheets made of porous fibers having air permeability, and sound absorption such, is formed in the fiber between sound absorption, so be achieved also by the space that, it is the sound-absorbing material is very large sound-absorbing effect.