| 摘要 |
<P>PROBLEM TO BE SOLVED: To develop/provide a road surface side sound absorption floor undercover for an automobile establishing sound absorption performance of large sound prevention effect and surface water repellent and using a base material having an expansion property and excellent in durability strength. Ž<P>SOLUTION: As a means for solving the problem, the road surface side sound absorption floor undercover for the automobile characterized in that in the undercover, a road surface side sound absorption material is stuck/provided on any one surface or both surfaces of a surface or a back surface between a reinforcement layer and a core material and a sound absorption structure is provided at the road surface side becoming a secondary sound source is provided. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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