| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive sound absorbing material by recycling a waste material, exhibiting excellent sound absorption effect in a low frequency region, which is required in a construction machine and a vehicle or the like. SOLUTION: An absorbing material 30 is constituted by laminating resin films 33 on both faces of a base substance 31 in which small pieces of flexible polyurethane foam with cell membrane removed are connected with a binder, and sound absorption is improved by membrane oscillation of the resin film 33, and it is prevented that the small pieces of the flexible polyurethane foam with cell membrane removed, are fallen off like powder from the base substance 31. It is desirable that the small piece of the flexible polyurethane foam with cell membrane removed has a size of 20 to 50 mm. Moreover, it is desirable that the small piece of the flexible polyurethane foam with cell membrane removed, is composed of a pulverized waste material. COPYRIGHT: (C)2008,JPO&INPIT
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