Sound Absorbing and Heat Insulating Material

Abstract

[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.

1 . A sound absorbing and heat insulating material having at least one peak of a 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. 
   
   
       2 . A sound absorbing and heat insulating material, wherein 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/m2; 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/m2, and a thickness of 4 to 30 mm; are integrated by compounding by a plurality of through-passing fibers. 
   
   
       3 . The sound absorbing and heat insulating material according to  claim 1 , wherein Frazier gas permeability is between 0.05 and 100 cm 3 cm 2  second. 
   
   
       4 . The sound absorbing and heat insulating material according to  claim 2 , wherein Frazier gas permeability is between 0.05 and 100 cm 3 /cm 2  second. 
   
   
       5 . The sound absorbing and heat insulating material according to  claim 2 , wherein the nonwoven fabric A and the film layer B are compounded by an extrusion laminating method, and further integrated by compounding with the staple fiber nonwoven fabric C layer by a needle punch method. 
   
   
       6 . The sound absorbing and heat insulating material according to  claim 5 , wherein 5 to 200 numbers/cm 2  of loops having a height not less than 0.3 mm exist at least on one side of the film layer B by compounding using the needle punch method. 
   
   
       7 . The sound absorbing and heat insulating material according to  claim 2 , wherein the film layer B is constituted by a copolymer including polypropylene or any one of polypropylene, polyethylene, and polyoctene, and the film layer B has a thickness of 10 to 50 microns. 
   
   
       8 . The sound absorbing and heat insulating material according to  claim 2 , wherein aluminum is vapor-deposited on at least one side of the film layer.