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Title:
LAYERED SOUND-ABSORBING MATERIAL
Document Type and Number:
WIPO Patent Application WO/2020/255500
Kind Code:
A1
Abstract:
The invention addresses the problem of providing a sound-absorbing material having excellent sound-absorbing properties in a low-frequency region, a medium-frequency region, and further, a high-frequency region. The layered sound-absorbing material contains a first layer comprising at least one layer, and a second layer comprising at least one layer that is different from the first layer. The first layer has a mean flow rate pore diameter of 2.0 to 60 μm, and an air permeability of 30 to 200 cc/cm2·s according to a Frazier type method. The second layer comprises at least one selected from the group consisting of a foamed resin, a non-woven fabric, and a woven fabric, has a thickness of 3 to 40 mm and a density that is lower than that of the first layer, of 51 to 150 kg/m3. In the layered sound-absorbing material, the first layer is disposed more to the sound entry side than the second layer.

Inventors:
HATTORI TAKAYUKI (JP)
ITO HIDEMI (JP)
Application Number:
PCT/JP2020/011334
Publication Date:
December 24, 2020
Filing Date:
March 16, 2020
Export Citation:
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Assignee:
JNC CORP (JP)
JNC FIBERS CORP (JP)
International Classes:
B32B5/26; G10K11/168
Foreign References:
JP2006028708A2006-02-02
JP2009186825A2009-08-20
JPH0346267B21991-07-15
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