Patent ID: 7694779

Claim:
A sound-absorbing material, wherein: (a) a non-woven fabric with a mass per unit area of 150 to 800 g/m 2 and a bulk density of 0.01 to 0.2 g/cm 3 and (b) a surface material with an air permeability of not more than 50 cc/cm 2 /sec measured according to JIS L-1096 are layered by bonding, and the number of the bonding points of the non-woven fabric and the surface material is not more than 30 points/cm 2 , and the ratio of the total surface area of the bonding points to the total surface area of the bonding points and the non-bonding points is not more than 30%, and (b) the surface material is a spun bonded non-woven fabric or a wet-laid non-woven staple fabric.