Title:
LAMINATED SOUND ABSORBING MATERIAL
Document Type and Number:
WIPO Patent Application WO/2020/194788
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a sound absorbing material which exhibits excellent sound absorbing performance in low-frequency and intermediate-frequency ranges, and preferably also in higher-frequency ranges. This laminated sound absorbing material includes at least: a fiber layer; and a porous layer, wherein the fiber layer has an average flowrate fine pore diameter of 1.0-60 µm and an air permeability as measured with a Frazier form method of 30-220 cc/cm2·s, and the porous layer comprises at least one selected from the group consisting of foamed resins, unwoven fabrics, and woven fabrics, has a thickness of 3-40 mm and a density of 3-50 kg/m3 which is lower than that of the fiber layer, and is disposed such that the fiber layer is on the sound entry side.
Inventors:
HATTORI TAKAYUKI (JP)
ITO HIDEMI (JP)
ITO HIDEMI (JP)
Application Number:
PCT/JP2019/035016
Publication Date:
October 01, 2020
Filing Date:
September 05, 2019
Export Citation:
Assignee:
JNC CORP (JP)
JNC FIBERS CORP (JP)
JNC FIBERS CORP (JP)
International Classes:
G10K11/16; B32B5/24; B32B7/02; G10K11/168
Domestic Patent References:
| WO2016143857A1 | 2016-09-15 |
Foreign References:
| JP2012073620A | 2012-04-12 | |||
| JP2014015042A | 2014-01-30 | |||
| JP2014529524A | 2014-11-13 | |||
| JP2016137636A | 2016-08-04 | |||
| FR185F |
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