| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorption underlayer material which resolves a problem of a conventional sound absorption underlayer material, effectively absorbs the sound generated upstairs, excels in feeling upon walking, and forms no level difference or wave on a floor surface even when a load is applied thereto for a long time. SOLUTION: The sound absorption underlayer material comprises a nonwoven fabric layer formed of resin fibers, and a resin sheet laminated on and integrated with the nonwoven fabric layer. The resin sheet has a number of projecting bodies which project downward from a lower surface of a base part having a uniform thickness, and fit into the nonwoven fabric layer. Each of the projecting bodies is formed to have a shape of a hemisphere, and has a projecting height of 1.0 to 2.0 mm. The arrangement pitch of the projecting bodies is 5.0 to 10.0 mm. A basis weight of the unwoven fabric layer is 100 to 200 g/m<SP>2</SP>. COPYRIGHT: (C)2006,JPO&NCIPI
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