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Title:
SOUND-ABSORBING MATERIAL AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/163621
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a sound-absorbing material having excellent sound absorption performance in a wide range from the low frequency range to the high frequency range, and a method for producing the sound-absorbing material. Provided is a sound-absorbing material that is a layered structure including a first fiber layer and a second fiber layer, wherein the sound-absorbing material is characterized in that the relationship between the average pore diameter (D) (μm) in the first fiber layer and the air permeability (G) in the layered structure (cm3/cm2•sec) satisfies 1.0 ≤ D/G ≤ 10, the relationship between the air permeability (G) (cm3/cm2•sec) in the layered structure and the coefficient of variation (B) of the pore diameter in the first fiber layer satisfies 5.0 ≤ G/B ≤ 25, and the first fiber layer is arranged on the sound source side. Also provided is a method for producing the sound-absorbing material that has an air permeability (G) of 1.5 cm3/cm2•sec or more and no more than 18.0 cm3/cm2•sec and is a layered structure with the first fiber layer arranged on the sound source side, in which the method includes a step for forming the first fiber layer by a spunlace method and a step for layering and integrating at least the first fiber layer and the second fiber layer by a needle punch method and forming the layered structure.

Inventors:
HENMI TATSUYA (JP)
MINEMURA SHINICHI (JP)
TANAKA SHIGEKI (JP)
WATANABE YUHEI (JP)
IIDA TAKAAKI (JP)
Application Number:
PCT/JP2022/002573
Publication Date:
August 04, 2022
Filing Date:
January 25, 2022
Export Citation:
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Assignee:
TOYO BOSEKI (JP)
YUHO CO LTD (JP)
International Classes:
B32B5/26; D04H1/498; G10K11/16; G10K11/168
Attorney, Agent or Firm:
USFI PATENT ATTORNEYS INTERNATIONAL OFFICE (JP)
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