Title:
SOUND-ABSORBING MATERIAL
Document Type and Number:
WIPO Patent Application WO/2023/190398
Kind Code:
A1
Abstract:
This sound-absorbing material has three or more layers of non-woven fabric including a first spun-bond non-woven fabric, a melt-blown non-woven fabric and a second spun-bond non-woven fabric. The sound-absorbing material comprises, in the following order along the layer thickness direction from the side of an entry surface which sound permeates: a layer A having air permeability of not more than 48 cc/cm2/sec; a layer B which is a layer or a foamed body having air permeability of 20 cc/cm2/sec to 4500 cc/cm2/sec; a layer C having the three or more layers of non-woven fabric including the first spun-bond non-woven fabric, the melt-blown non-woven fabric and the second spun-bond non-woven fabric, and having air permeability of not more than 48 cc/cm2/sec; and a layer D which is a layer, a foamed body, or a rear air layer having an air permeability of 20 cc/cm2/sec to 4500 cc/cm2/sec.
Inventors:
ICHIKAWA TARO (JP)
HANAMAKI CHIAKI (JP)
HANAMAKI CHIAKI (JP)
Application Number:
PCT/JP2023/012311
Publication Date:
October 05, 2023
Filing Date:
March 27, 2023
Export Citation:
Assignee:
MITSUI CHEMICALS INC (JP)
International Classes:
G10K11/16; G10K11/168
Domestic Patent References:
| WO2022009835A1 | 2022-01-13 |
Foreign References:
| JP2021192983A | 2021-12-23 |
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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