Sound absorption material and method of manufacturing sound absorption material
First Claim
1. A method of manufacturing a sound absorption material, the method comprising:
- forming a low density fibrous web to act as a porous bulk absorber, the low density fibrous web having a density of more than about 10 kg/m3 and less than about 120 kg/m3, and containing a proportion of bi-component fibers, each bi-component fiber having a core material and a sheath material around the core material, the sheath material having a lower melting point than the core material;
applying a thin facing layer directly to the low density fibrous web, wherein the facing layer is a non-adhesive type film that is adhesively compatible with the sheath material;
heating the low density fibrous web to a temperature sufficient to soften the sheath material of at least some of the bi-component fibers; and
pressing the facing layer and low density fibrous web together under low pressure such that at least part of the facing layer directly contacts the softened sheath material of at least some of the bi-component fibers to form an adhesive bond between the facing layer and the fibrous web, and the fibrous web remains a low density fibrous web after release of said low pressure.
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Accused Products
Abstract
Described embodiments relate to a method of manufacturing a sound absorption material. The method comprises: forming a low density fibrous web to act as a porous bulk absorber, the fibrous web containing a proportion of bi-component fibers, each bi-component fiber having a core material and a sheath material around the core material, the sheath material having a lower melting point than the core material; applying a thin facing layer to the low density fibrous web, wherein the facing layer is adhesively compatible with the sheath material; heating the fibrous web to a temperature sufficient to soften the sheath material of at least some of the bi-component fibers; and pressing the facing layer and fibrous web together under low pressure such that at least part of the facing layer contacts the softened sheath material of at least some of the bi-component fibers to form an adhesive bond between the facing layer and the fibrous web.
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Citations
18 Claims
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1. A method of manufacturing a sound absorption material, the method comprising:
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forming a low density fibrous web to act as a porous bulk absorber, the low density fibrous web having a density of more than about 10 kg/m3 and less than about 120 kg/m3, and containing a proportion of bi-component fibers, each bi-component fiber having a core material and a sheath material around the core material, the sheath material having a lower melting point than the core material; applying a thin facing layer directly to the low density fibrous web, wherein the facing layer is a non-adhesive type film that is adhesively compatible with the sheath material; heating the low density fibrous web to a temperature sufficient to soften the sheath material of at least some of the bi-component fibers; and pressing the facing layer and low density fibrous web together under low pressure such that at least part of the facing layer directly contacts the softened sheath material of at least some of the bi-component fibers to form an adhesive bond between the facing layer and the fibrous web, and the fibrous web remains a low density fibrous web after release of said low pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17)
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12. A sound absorption material comprising:
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a low density fibrous web to act as a porous bulk absorber, the low density fibrous web having a density of more than about 10 kg/m3 and less than about 120 kg/m3, and containing a proportion of bi-component fibers, each bi-component fiber having a core material and a sheath material around the core material, the sheath material having a lower melting point than the core material; and a thin facing layer in the form of a non-adhesive type film directly adhered to the low density fibrous web by an adhesive bond formed between the sheath material of at least some of the bi-component fibers and the thin facing layer. - View Dependent Claims (13, 14, 15, 16)
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18. A method of manufacturing a sound absorption material, the method comprising:
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providing a low density fibrous web to act as a porous bulk absorber, the low density fibrous web having a density of more than about 10 kg/m3 and less than about 120 kg/m3, and containing a proportion of bi-component fibers, each bi-component fiber having a core material and a sheath material around the core material, the sheath material having a lower melting point than the core material; supplying the low density web in a thermally bonded state and thereafter applying a thin facing layer in the form of a non-adhesive type film directly to the low density fibrous web; heating the low density fibrous web to a temperature sufficient to soften the sheath material of at least some of the bi-component fibers; and pressing the facing layer and low density fibrous web together under low pressure such that at least part of the facing layer directly contacts the softened sheath material of at least some of the bi-component fibers to form an adhesive bond between the facing layer and the fibrous web.
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Specification