Sound insulation sheet and sound insulation structure

Patent metadata

Field	Value
Publication number	US-2024242701-A1
Application number	US-202418621998-A
Country	US
Kind code	A1
Filing date	Mar 29, 2024
Priority date	Sep 30, 2021
Publication date	Jul 18, 2024
Grant date	—

Abstract

The present disclosure provides a sound insulation sheet comprising a sheet member, and convex members arranged so as to obtain at least two peaks in a graph obtained by measuring a sound transmission loss of the sound insulation sheet, with the horizontal axis of a frequency X and the vertical axis of ΔTL (dB) obtained by the following formula (1), and to have at least two of these peaks with a height of 3 dB or more;Δ⁢TL=TL⁢1-TL⁢2,(1)wherein TL1 represents a sound transmission loss (dB) of the sound insulation sheet at the frequency X, and TL2 represents a sound transmission loss (dB) of a flat sheet having no concavo-convex structure and having the same mass as that of the sound insulation sheet and the same area as that of the sheet member at the frequency X.

First claim

1 . A sound insulation sheet, comprising a sheet member and convex members,
the sound insulation sheet having at least a convex member A and a convex member B different in shape from each other as the convex members, the sound insulation sheet having two or more convex regions each having the convex member A present on one surface of the sheet member and two or more convex regions each having the convex member B present on one surface of the sheet member, wherein at least two peaks are obtained in a graph obtained by measuring a sound transmission loss, with the horizontal axis of a frequency X and the vertical axis of ΔTL (dB) obtained by the following formula (1), and at least two of these peaks each have a height of 3 dB or more;

Δ
⁢
TL

=

TL

1

-

TL

2

,

(
1
)

wherein TL 1 represents a sound transmission loss (dB) of the sound insulation sheet at the frequency X, and TL 2 represents a sound transmission loss (dB) of a flat sheet having no concavo-convex structure and having the same mass as that of the sound insulation sheet and the same area as that of the sheet member at the frequency X.

2 . The sound insulation sheet according to claim 1 , wherein the convex member A comprises a line-shaped convex member.

3 . The sound insulation sheet according to claim 1 , wherein the convex member B is present in a plurality in each of the convex regions B, and the convex member B comprises a dot-shaped convex member.

4 . A sound insulation sheet, comprising a sheet member and convex members,
the sound insulation sheet having at least a line-shaped convex member and a plurality of dot-shaped convex members as the convex members, the sound insulation sheet having two or more convex regions each having the line-shaped convex member present on one surface of the sheet member and two or more convex regions each having a plurality of the dot-shaped convex members present on one surface of the sheet member.

5 . The sound insulation sheet according to claim 4 , having a row structure composed of one or more rows of the dot-shaped convex members arranged in each of the convex regions where a plurality of the dot-shaped convex members are present, wherein a longitudinal direction of the row structure is substantially parallel to a longitudinal direction of a row structure composed of the line-shaped convex member.

6 . The sound insulation sheet according to claim 5 , wherein the row structure composed of the line-shaped convex member and the row structure composed of the dot-shaped convex members are arranged alternately in a plan view.

7 . The sound insulation sheet according to claim 5 , wherein the row structure composed of the line-shaped convex member and the row structure composed of the dot-shaped convex members are arranged alternately and at equal intervals in a plan view.

8 . The sound insulation sheet according to claim 5 , wherein the dot-shaped convex members in the row structure are arranged at equal intervals.

9 . The sound insulation sheet according to claim 5 , having
a value calculated by (a total mass of the line-shaped convex members/a mass of the sheet member) of 0.8 or more, a value calculated by (a total mass of the dot-shaped convex members/a mass of the sheet member) of 0.15 or more, and a value calculated by (a total mass of the line-shaped convex members/a total mass of the dot-shaped convex members) of 3.5 or more and 15 or less.

10 . The sound insulation sheet according to claim 4 , wherein the dot-shaped convex members are each cylindrical in shape.

11 . The sound insulation sheet according to claim 4 , wherein the dot-shaped convex members are each prismatic in shape.

12 . The sound insulation sheet according to claim 2 ,
wherein the convex member B comprises a line-shaped convex member having a different length from that of the line-shaped convex member A, and a plurality of the convex members B, which are line-shaped convex members, are arranged in series in each of the convex regions where the convex members B are present.

13 . The sound insulation sheet according to claim 4 , wherein at least two peaks are obtained in a graph obtained by measuring a sound transmission loss, with the horizontal axis of a frequency X and the vertical axis of ΔTL (dB) obtained by the following formula (1), and at least two of these peaks each have a height of 3 dB or more;

Δ
⁢
TL

=

TL

1

-

TL

2

,

(
1
)

wherein TL 1 represents a sound transmission loss (dB) of the sound insulation sheet at the frequency X, and TL 2 represents a sound transmission loss (dB) of a flat sheet having no concavo-convex structure and having the same mass as that of the sound insulation sheet and the same area as that of the sheet member at the frequency X.

14 . The sound insulation sheet according claim 1 , wherein the convex members each comprise at least one selected from the group consisting of a photo-curable resin and a thermoplastic resin.

15 . A sound insulation structure, comprising the sound insulation sheet according claim 1 laminated to a sound absorbing material.

Assignees

• Mitsubishi Chem Corp

Inventors

• Nakayama Masanari
• Matsuoka Takeshi
• Koshitouge Haruki

Classifications

• E04B1/8409

  sheet-shaped · CPC title

• B32B3/085

  spaced apart pieces on the surface of a layer · CPC title

• B32B3/06

  for securing layers together; for attaching the product to another member, e.g. to a support {, or to another product, e.g. groove/tongue, interlocking} · CPC title

• B32B3/16

  secured to a flexible backing · CPC title

• B32B2307/102

  Insulating · CPC title