| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorption panel which has an absorption layer and a sound insulation layer formed with an air layer interposed and that has the air layer easily formed and improves sound absorbing performance through irregular reflection by a partition wall of an opening core and repetition of convergence and diffusion by a through hole.SOLUTION: A paper core layer 1 having a thickness tis formed by sandwiching, bonding, and fixing both surfaces of a porous board material 25 having a through hole between a first paper core material 4 and a second paper core material 4a made of craft paper having many opening cores 5. The area of the through hole 26 is much smaller than the area of the opening cores 5. An integrated panel 40 having respective layers laminated is constituted by sticking and bonding a sound absorption layer 20 having thickness tformed by compressing a special felt material to one surface 6 (the side of first paper core material 4) of the paper core layer 1 and a sound insulation layer 30 having thickness tmade of a steel plate to the other surface 6a (the side of the second paper core material 4a) respectively. A frame material 42 is fitted to the four sides of the panel material 40, and the sound absorption panel is used with the sound absorption layer 20 directed to a noise source. |
