Sound-absorbing material
AssigneesIbiden Co., Ltd., Toyota Jidosha Kabushiki Kaisha
InventorsTakanori Kawai, Tomoki Mabuchi
Life of this patent
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Abstract
The present invention provides a sound-absorbing material having sound absorption performance with an average sound absorption coefficient of 0.70 or more in the frequency range of 800 to 5000 Hz. The present invention provides a sound-absorbing material including: a fiber layer including a plurality of holes open to a surface thereof and having a thickness of 3 mm or more; and an inorganic material layer mainly containing a calcium-based material and having a thickness of 0.4 to 0.6 mm on the surface of the fiber layer, the holes being blind holes each penetrating through the inorganic material layer and having a bottom inside the fiber layer, each hole having a depth corresponding to 50 to 90% of the thickness of the fiber layer.
Claims8
A sound-absorbing material comprising:
- a fiber layer including a plurality of holes open to a surface thereof and having a thickness of 3 mm or more;
- and
- an inorganic material layer mainly containing a calcium-based material and having a thickness of 0.4 to 0.6 mm on the surface of the fiber layer,
- the holes being blind holes each penetrating through the inorganic material layer and having a bottom inside the fiber layer,
- each hole having a depth corresponding to 50 to 90% of the thickness of the fiber layer,
- wherein, in a plan view of the sound-absorbing material, a shape and size of portions of the holes that penetrate the inorganic material layer is a same as a shape and size of portions of the holes in the fiber layer, and
- each of the holes has the same shape and size.
Dependencies are inferred from the claim text.