Sound-absorbing outer covering material and sound-absorbing material
A sound-absorbing membrane and a sound-absorbing material, which can improve sound absorbing performance and can improve releasability, are provided. A sound-absorbing membrane 10 includes a base sheet 11 made of a nonwoven fabric impregnated with a water-soluble polymer, and a resin film 12 made of a thermosetting resin covering one surface of the base sheet 11 , in which a thickness of the resin film 12 is 0.01 to 0.2 mm, fillers 13 are dispersed in the resin film 12 , and a whole airflow resistance is 0.2 to 5.0 kPa·s/m. A sound-absorbing material 20 includes the sound-absorbing membrane 10 , and a sound absorbing base sheet 21 made of a porous material, in which the sound-absorbing membrane 10 is laminated on a surface of the sound absorbing base sheet 21 , and then formed into a predetermined shape.
1. A sound-absorbing membrane comprising:
a base sheet made of a nonwoven fabric impregnated with a water-soluble polymer; and
a resin film made of a thermosetting resin covering one surface of the base sheet,
wherein
a thickness of the resin film is 0.01 to 0.2 mm,
fillers are dispersed in the resin film, and
a whole airflow resistance of the sound-absorbing membrane is 0.2 to 5.0 kPa·s/m.
2. The sound-absorbing membrane according to claim 1 , wherein the water-soluble polymer is impregnated into the nonwoven fabric at a ratio of 0.5 to 5.0% by mass with respect to a mass per unit area of the nonwoven fabric in terms of solid content.
3. The sound-absorbing membrane according to claim 1 , wherein the nonwoven fabric is made of a synthetic fiber and/or a cellulose fiber having a softening point of 220° C. or higher.
4. The sound-absorbing membrane according to claim 1 , wherein, in the resin film, the thermosetting resin is a phenolic resin.
5. The sound-absorbing membrane according to claim 1 , wherein, in the resin film, a mixing ratio of the fillers/the thermosetting resin is 55/45 to 70/30 in a solid content ratio.
6. A sound-absorbing material comprising:
the sound-absorbing membrane according to claim 1 ; and
a sound absorbing base sheet made of a porous material,
wherein the sound-absorbing membrane is laminated on a surface of the sound absorbing base sheet, and then formed into a predetermined shape.
7. The sound-absorbing membrane according to claim 2 , wherein the nonwoven fabric is made of a synthetic fiber and/or a cellulose fiber having a softening point of 220° C. or higher.
8. The sound-absorbing membrane according to claim 2 , wherein, in the resin film, the thermosetting resin is a phenolic resin.
9. The sound-absorbing membrane according to claim 3 , wherein, in the resin film, the thermosetting resin is a phenolic resin.
10. The sound-absorbing membrane according to claim 2 , wherein, in the resin film, a mixing ratio of the fillers/the thermosetting resin is 55/45 to 70/30 in a solid content ratio.
11. The sound-absorbing membrane according to claim 3 , wherein, in the resin film, a mixing ratio of the fillers/the theii iosetting resin is 55/45 to 70/30 in a solid content ratio.
12. The sound-absorbing membrane according to claim 4 , wherein, in the resin film, a mixing ratio of the fillers/the thermosetting resin is 55/45 to 70/30 in a solid content ratio.
13. A sound-absorbing material comprising:
the sound-absorbing membrane according to claim 2 ; and
a sound absorbing base sheet made of a porous material,
wherein the sound-absorbing membrane is laminated on a surface of the sound absorbing base sheet, and then fainted into a predeteiinined shape.
14. A sound-absorbing material comprising:
the sound-absorbing membrane according to claim 3 ; and
a sound absorbing base sheet made of a porous material,
wherein the sound-absorbing membrane is laminated on a surface of the sound absorbing base sheet, and then formed into a predetermined shape.
15. A sound-absorbing material comprising:
the sound-absorbing membrane according to claim 4 ; and
a sound absorbing base sheet made of a porous material,
wherein the sound-absorbing membrane is laminated on a surface of the sound absorbing base sheet, and then formed into a predetermined shape.
16. A sound-absorbing material comprising:
the sound-absorbing membrane according to claim 5 ; and
a sound absorbing base sheet made of a porous material,
wherein the sound-absorbing membrane is laminated on a surface of the sound absorbing base sheet, and then fonned into a predetermined shape.