Molded body, sound absorbing material, vibration absorbing material

Patent metadata

Field	Value
Publication number	US-12227938-B2
Application number	US-202117915445-A
Country	US
Kind code	B2
Filing date	Mar 29, 2021
Priority date	Mar 30, 2020
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

Disclosed a molded body including: a plurality of cavity portions formed inside a molding material; and a plurality of neck portions provided in each of the plurality of cavity portions and configured to communicate with the cavity portions, wherein some of the plurality of neck portions communicate with a surface and/or the cavity portion exposed on the surface, wherein at least some of the plurality of neck portions cause the plurality of cavity portions to communicate with each other, and wherein an inner surface of the neck portion is formed by the molding material itself.

First claim

The invention claimed is:

1. A molded body comprising:
a plurality of cavity portions formed inside a molding material; and
a plurality of neck portions provided in each of the plurality of cavity portions and configured to communicate with the cavity portions,
wherein some of the plurality of neck portions communicate with a surface and/or the cavity portion exposed on the surface,
wherein at least some of the plurality of neck portions cause the plurality of cavity portions to communicate with each other,
wherein an inner surface of the neck portion is formed by the molding material itself, and
wherein a protruding portion is formed by the neck portion, the protruding portion protruding from an inner surface of the cavity portion into the cavity portion, and a protruding height of the protruding portion with respect to the inner surface of the cavity portion is 100 μm or less.

2. The molded body according to claim 1 , wherein the cavity portions and the neck portions communicating with the cavity portions are integrally formed by the same molding material.

3. The molded body according to claim 1 ,
wherein the molded body is a foamed body, and
wherein the cavity portion is formed by a cell which is larger than an average diameter of all cells by 100% or more among cells inside the foamed body.

4. The molded body according to claim 3 , wherein at least some of the neck portions are formed by the cells inside the foamed body.

5. The molded body according to claim 1 , wherein at least some of the neck portions have a shape in which a center line extends linearly.

6. The molded body according to claim 1 ,
wherein the plurality of cavity portions and the plurality of neck portions constitute a wavelength absorbing unit, and
wherein a wavelength absorption coefficient of the wavelength absorbing unit at 450 Hz or more and 10000 Hz or less is 0.4 or more.

7. The molded body according to claim 1 , wherein a vertical incidence sound absorption coefficient per 10 mm thickness at 450 Hz or more and 10000 Hz or less is 0.4 or more.

8. The molded body according to claim 1 , wherein a diameter of the neck portion is 10 μm or more and 1000 μm or less.

9. The molded body according to claim 1 , wherein a volume of the cavity portion is 4.19×10 9 μm 3 or more and 3.82×10 11 μm 3 or less.

10. The molded body according to claim 1 , further comprising:
a main surface;
a back surface provided to face the main surface; and
one or more side surfaces provided between the main surface and the back surface,
wherein some of the plurality of neck portions are exposed on the main surface or the cavity portion exposed on the main surface.

11. A sound absorbing material which is the molded body according to claim 1 .

12. A vibration absorbing material which is the molded body according to claim 1 .

Assignees

• Tosoh Corp

Inventors

• Nakajima Satoru

Classifications

• G10K11/162

  Selection of materials · CPC title

• B60R13/08

  Insulating elements, e.g. for sound insulation {(sound insulating linings for trains B61D17/185; drivers' cabs for load-carrying vehicles insulated against vibrations or noise B62D33/0604; thermal or acoustic insulation of engines F02B77/11; damping of sounds using compensation by electro-acoustic methods G10K11/178)} · CPC title

• G10K11/16

  Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) · CPC title

• E04B1/8404

  block-shaped · CPC title

• E04B2001/8485

  the opening being restricted, e.g. forming Helmoltz resonators · CPC title