Sound-absorbing panel and production method of the same

Abstract

In order to provide a sound-absorbing panel and a production method of the same which has excellent freedom of design and have small differences in the maximum sound-absorbing coefficients among products, a sound-absorbing panel is adopted which is characterized by a panel main body (4) which is constituted by arranging both a porous veneer (2) of 0.02-0.5 mm thickness with multiple pierced apertures of 0.1 mm or smaller aperture diameters or 0.2 mm or smaller aperture diameters and a porous sound-absorbing base material (3) set at a backside (2a) of the porous veneer (2) so as to be overlapped, and is characterized by having a value of airflow resistance in a range of 0.1-1.0 Pa.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an outline drawing of a cross-section showing an example of a sound-absorbing panel of an embodiment of the present invention.

FIG. 2 is an outline drawing of a cross-section showing another example of a sound-absorbing panel of an embodiment of the present invention.

FIG. 3 is an outline drawing showing a measuring apparatus of a value of the airflow resistance.

FIG. 4 is a graph showing a relationship between maximum sound-absorbing coefficients and the values of the airflow resistance based on measured results of normal incidence sound-absorbing characteristics of the sound-absorbing panels of samples No. 1-25.

FIG. 5 is a flow chart showing one example of production steps of a porous veneer.

FIG. 6 is a flow chart showing another example of production steps of the porous veneer.

FIG. 7 is a graph showing the frequency dependency of normal incidence sound-absorbing characteristics of a first embodiment.

FIG. 8 is a graph showing the frequency dependency of normal incidence sound-absorbing characteristics of a second embodiment.

FIG. 9 is a graph showing the frequency dependency of normal incidence sound-absorbing characteristics of a third embodiment.

FIG. 10 is a graph showing the frequency dependency of normal incidence sound-absorbing characteristics of a fourth embodiment.

FIG. 11 is a graph showing the frequency dependency of normal incidence sound-absorbing characteristics of fifth and sixth embodiments and a first comparative example.

FIG. 12 is a graph showing a relationship between maximum sound-absorbing coefficients and the values of the airflow resistance based on measured results of normal incidence sound-absorbing characteristics of the sound-absorbing panels of samples No. 26-42.

FIG. 13 is a graph showing the frequency dependency of normal incidence sound-absorbing characteristics of a sample No. 44 of an eighth embodiment.

FIG. 14 is a graph showing the frequency dependency of normal incidence sound-absorbing characteristics of a sample No. 50 of a ninth embodiment.

Claims

1. A sound-absorbing panel comprising a panel main body, wherein: the panel main body comprises: a porous veneer of 0.02-0.5 mm thickness which comprises pierced apertures of 0.2 mm or smaller aperture diameters or 0.1 mm or smaller aperture diameters; anda porous sound-absorbing base material arranged at a backside of the porous veneer;the panel main body is constituted by arranging the porous veneer and the porous sound-absorbing base material to be overlapped; anda value of airflow resistance of the panel main body is in a range of 0.1-1.0 Pa.

2. A sound-absorbing panel according to claim 1, wherein a value of airflow resistance of the porous sound-absorbing base material is in a range of 0.1-0.8 Pa.

3. A sound-absorbing panel comprising a panel main body, wherein: the panel main body comprises: a porous veneer of 0.02-0.5 mm thickness which comprises pierced apertures of 0.2 mm or smaller aperture diameters or 0.1 mm or smaller aperture diameters; anda supporting base material arranged at a backside of the porous veneer;the panel main body is constituted by arranging the porous veneer and the supporting base material to be overlapped; anda value of airflow resistance of the panel main body is in a range of 0.1-1.0 Pa.

4. A sound-absorbing panel according to claim 3, wherein the supporting base material is a honeycomb structure material or a punching metal or an expanded metal.

5. A sound-absorbing panel according to claim 1, wherein both the porous veneer and the porous sound-absorbing base material are detachably attached.

6. A sound-absorbing panel according to claim 3, wherein both the porous veneer and the porous sound-absorbing base material are detachably attached.

7. A production method of a sound-absorbing panel comprising the steps of: forming a porous veneer by forming a plurality of pierced apertures of 0.2 mm or smaller aperture diameters or 0.1 mm or smaller aperture diameters on a veneer of 0.02-0.5 mm thickness; andconstituting a panel main body by arranging a porous sound-absorbing base material or a supporting base material at a backside of the porous veneer to be overlapped, along with setting a value of airflow resistance of the panel main body in a range of 0.1-1.0 Pa.

8. A production method of a sound-absorbing panel according to claim 7, wherein a design is applied to a surface of the porous veneer opposite to the backside.