| 摘要 |
PROBLEM TO BE SOLVED: To prevent the penetration of moisture by forming a sound absorbing material consisting of a core material layer consisting of an organic fiber nonwoven fabric and a surface layer consisting of a water repellent-finished organic fiber nonwoven fabric laminated on one side or both sides of the core material layer through an adhesive layer. SOLUTION: A surface layer 2 consisting of an organic fiber nonwoven fabric is laminated on one side of a core material layer 1 consisting of an organic fiber nonwoven fabric through an adhesive layer 3 to form a fiber laminated sound absorbing material. The core material layer 1 consists of a sheet formed by mixing 35% of a polyester low melting point fiber with a fiber diameter of 3 deniers to 65% of a polyester fiber with a fiber diameter of 6 deniers, and the surface layer 2 consists of a polyester nonwoven fabric subjected to water repellent finishing. The apparent density of the core material layer 1 is set to 0.01 g/cm<3> or more, the apparent density of the surface layer 2 is set to 0.05 g/cm<3> or more, and the space between fibers is set to 200μm or less. Accordingly, the surface layer prevents the penetration of water drops to the core material layer, and noise can be sufficiently inputted from the surface layer to the core material layer to improve the sound absorbing performance.
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