| 摘要 |
<p>[PROBLEMS] Provided is a sound absorbing material having a light weight, a smaller thickness, and outstanding sound absorbing property and heat insulating property. [MEANS FOR SOLVING PROBLEMS] Used is a sound absorbing and heat insulating material having at least one peak of normal incident sound absorption coefficient in a range of 315 to 5000 Hz, a peak absorption coefficient not less than 80%, and a thickness of 5 to 30 mm. For example, a layer obtained by laminating a porous film layer B including a resin having a melting point not less than 120 degrees C to a nonwoven fabric A having a fiber with not less than 1 micron and not more than 25 microns of a fiber diameter, as a principal component, and a mass per unit area of 10 to 70 g/m 2 ; and a staple fiber nonwoven fabric C having a fiber diameter of 7 to 50 microns, a mass per unit area of 50 to 2000 g/m 2 , and a thickness of 4 to 30 mm; are integrated by compounding by a plurality of through-passing fibers, and thereby enabling set of a peak of a sound absorption coefficient.</p> |
