To provide a soundproof material for a vehicle having an excellent sound absorption performance with an extremely simple structure.SOLUTION: This invention relates to a sheet-like soundproof material 31, used for a vehicle and comprising a rubber, a thermoplastic elastomer, or a thermoplastic resin at low density of 0.08 or less. A cross sectional shape of the soundproof material is formed such that: a plurality of trapezoid parts 40, each of which is substantially symmetrical bilaterally to a bisector 200 and has a length 51 of an upper bottom 41 smaller than a length 52 of a lower bottom 42, are provided by continuously arranging the adjacent lower bottoms 42, 42 from side to side. When a length 42L of the lower bottom 42 is regarded as a reference value S, a length 41L of the upper bottom 41 to the reference value S is 59% or more.SELECTED DRAWING: Figure 2
【課題】極めて簡易な構造で吸音性能に優れる自動車用防音材を提供する。【解決手段】自動車に使用される、0.08以下の低比重でゴム又は熱可塑性エラストマー又は熱可塑性樹脂からなるシート状の防音材31であって、その断面形状は、上下二等分線200に対して左右略対称で下底42の長さ52よりも上底41の長さ51が短い台形部40が複数、隣接する下底42,42同士が左右に連設されてなる形状であり、下底42の長さ42Lを基準値Sにした場合、基準値Sに対する上底41の長さ41Lを59%以上にした。を確保した。【選択図】図2
SOUNDPROOF MATERIAL FOR VEHICLE
自動車用防音材
2020-01-23
Patent
Electronic Resource
Japanese
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