Sound-absorbing material and method of making such a sound-absorbing material
AssigneeO.R.V. Manufacturing S.P.A.
InventorsFrancesca Beltrame, Marina Bastarolo, Arianna Alfonsi
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Abstract
Sound-absorbing material includes a monolithic main layer which is made of non-woven fiber fabric and has two opposite faces delimiting the thickness of the monolithic main layer. The monolithic main layer has a density gradient in the direction of its thickness. The monolithic main layer has a gradient in the fiber count in the direction of its thickness which decreases, passing from a first face to a second face of the monolithic main layer. The density gradient has an inverse trend with respect to the gradient in fiber count.
Claims31
A sound-absorbing material comprising;
- a monolithic main layer made of non-woven fiber fabric, and having two opposite faces delimiting a thickness of said monolithic main layer, said monolithic main layer having a density gradient in a direction of the thickness,
- wherein said monolithic main layer has a fiber count gradient in the direction of the thickness of the monolithic main layer which decreases, passing from a first face to a second face of said monolithic main layer, wherein the density gradient has an inverse trend relative to the fiber count gradient, so that zones of lower fiber count correspond to zones of higher density, and
- wherein the monolithic main layer comprises non-homogeneous tortuosity and porosity.
A sound-absorbing material comprising:
- a monolithic main layer made of non-woven fiber fabric, and having two opposite faces delimiting a thickness of said monolithic main layer, said monolithic main layer having a density gradient in a direction of the thickness;
- wherein said monolithic main layer has a fiber count gradient in the direction of the thickness of the monolithic main layer which decreases, passing from a first face to a second face of said monolithic main layer, wherein the density gradient has an inverse trend relative to the fiber count gradient so that zones of lower fiber count correspond to zones of higher density;
- a porosity gradient in the direction of the thickness of the monolithic main layer increasing with the density gradient and an inverse trend relative to the fiber count gradient;
- a tortuosity gradient in the direction of the thickness of the monolithic main layer increasing with the density gradient and an inverse trend relative to the fiber count gradient.
Dependencies are inferred from the claim text.