| 摘要 |
PROBLEM TO BE SOLVED: To allow an optimal sound space including a low-pitched sound region to be realized, the optimal sound space being formed of a sound insulation material layer, an acoustic absorption layer, and an air layer of a paper core layer, by filling various acoustic absorption materials into a functional opening and a core of the paper core layer.SOLUTION: A functional opening 10 is formed in a paper core material 4, a low-pitched sound absorption material 12 such as glass wool is filled therein to make a paper core layer 1 (d). An acoustic absorption layer 20 is made of a fiber hard board obtained by compressing a textile material. A sound insulation layer 30 is made of a gypsum board. The acoustic absorption layer 20 is brought into close contact with one surface 6 of the paper core layer 1 while the sound insulation layer 30 is brought into close contact with the other surface 6a, thereby configuring an integrated panel 40 with every layers laminated (b) to (d). The panel 40 is provided with a frame material 42 having a U-shaped cross section such as a metallic frame on its four sides, and an external surface 21a of the acoustic absorption layer 20 and an external surface 31a of the sound insulation layer 30 are respectively covered by decorative cloths 44, 44 (a), (b). |
