Sound-absorbing material, production method of the same, and sound-absorbing panel

Abstract

In order to provide a sound-absorbing material and a sound-absorbing panel which can be produce at a low-cost and have excellent beauty or appearance and excellent sound-absorbing characteristics, the sound-absorbing material is applied which is made from a metallic plate member ( 2 ), and multiple pierced apertures of 200 μm or smaller diameter are arranged along a board thickness on the plate-shaped member ( 2 ).

1 . A sound-absorbing material comprising:
 a plate-shaped member made from a metal; and   a plurality of pierced apertures of 200 μm or smaller diameter provided on the plate-shaped member, and arranged along a board thickness direction of the plate-shaped member.   
   
   
       2 . A sound-absorbing material production method comprising the steps of:
 mixing a metallic powder and a pierced aperture forming agent powder;   forming a bulk body by solidifying and forming both the metallic powder and the pierced aperture forming agent powder along with drawing or drafting in a direction in a fibrous state;   forming a plate-shaped member by slicing the bulk body along an orthogonal direction to a drawn or drafted direction; and   forming a plurality of pierced apertures of a 200 μm or smaller in diameter by removing the pierced aperture forming agent from the plate-shaped member.   
   
   
       3 . A sound-absorbing material made by applying the sound-absorbing material production method according to  claim 2 . 
   
   
       4 . A sound-absorbing material according to  claim 1 , wherein an aperture ratio of the pierced apertures is in a range of 10-80%. 
   
   
       5 . A sound-absorbing material production method according to  claim 2 , wherein a mixture of both the metallic powder and the pierced aperture forming agent powder is extruded by applying a hot extrusion method upon forming the bulk body. 
   
   
       6 . A sound-absorbing material production method according to  claim 2 , wherein the metallic powder is one of Al, Mg, Sn or Cu, an alloy made from one of these metals as a main raw material, or a mixed powder of one of these metallic powders and the alloy. 
   
   
       7 . A sound-absorbing material production method according to  claim 2 , wherein the pierced aperture forming agent is made from a water-soluble salt. 
   
   
       8 . A sound-absorbing panel comprising:
 two or more sound-absorbing materials according to  claim 1  arranged at relatively sliding positions with a predetermined interval therebetween; and   one or more air layers arranged between the sound-absorbing materials.   
   
   
       9 . A sound-absorbing panel comprising:
 a sound-absorbing material according to  claim 1 ;   a rigid body arranged at a relatively sliding position from the sound-absorbing material with a predetermined interval therebetween; and   an air layer arranged between the sound-absorbing material and the rigid body.   
   
   
       10 . A sound-absorbing panel according to  claim 8 , further comprising a porous sound-absorbing material arranged at the air layer. 
   
   
       11 . A sound-absorbing panel according to  claim 9 , further comprising a porous sound-absorbing material arranged at the air layer. 
   
   
       12 . A sound-absorbing panel according to  claim 8 , further comprising a reinforcing member attached to a side of the air layer of the sound-absorbing material. 
   
   
       13 . A sound-absorbing panel according to  claim 9 , further comprising a reinforcing member attached to a side of the air layer of the sound-absorbing material.