ACOUSTIC WEB
First Claim
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1. A porous laminate comprising a discontinuous hot melt adhesive layer adhered to a semipermeable low surface energy airflow resistive porous membrane whose pores are substantially impenetrable by the adhesive.
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Abstract
Pore plugging is reduced when laminating an airflow resistive membrane to a thermoplastic hot melt adhesive, by treating the membrane to reduce its surface energy. This enables fabrication of acoustical laminates incorporating substantial amounts of recycled fibrous insulating mat manufacturing waste, and permits design of the laminate based primarily on one-quarter wavelength sound absorption considerations and control of the porosity and interfacial adhesion of the airflow resistant membrane.
119 Citations
32 Claims
- 1. A porous laminate comprising a discontinuous hot melt adhesive layer adhered to a semipermeable low surface energy airflow resistive porous membrane whose pores are substantially impenetrable by the adhesive.
- 4. A sound-absorbing laminate having a porous sound-absorbing spacing layer adjacent to a semipermeable airflow resistive membrane that is substantially impenetrable by molten polyethylene.
- 6. A porous laminate comprising a thermoplastic adhesive layer adjacent to a semipermeable fluorochemically-treated airflow resistive membrane.
- 9. A sound-modifying structure comprising a sound-reflecting surface spaced from a semipermeable sound modifying laminate comprising a facing layer and a porous membrane that is substantially impenetrable by molten polyethylene.
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12. A vehicular sound-absorbing structure comprising a decorative layer backcoated with a discontinuous hot melt adhesive layer adhered to a fluorochemically-treated nonwoven airflow resistive membrane having an airflow resistance between 50 and 5000 mks Rayls.
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13. A carpet comprising fibers tufted into a backing backcoated with a discontinuous hot melt adhesive layer adhered to a fluorochemically-treated nonwoven airflow resistive membrane having an airflow resistance between 50 and 5000 mks Rayls.
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14. An acoustical laminate comprising:
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a fibrous or open cell foam underlayment, a hot melt adhesive layer, a fluorochemically-treated nonwoven airflow resistive membrane having an airflow resistance between 50 and 5000 mks Rayls, a hot melt adhesive layer, and a decorative layer. - View Dependent Claims (15)
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- 16. A nonwoven acoustic insulating laminate, the laminate comprising at least a porous membrane which has been treated so that it has a surface energy less than about 34 dynes/cm2, and at least a layer of fibrous material or open cell foam, the laminate being positioned in a vehicle such that the laminate attenuates sound waves passing from a source area to a receiving area in the vehicle.
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26. A method for attenuating transmitted sound waves passing from a source area to a receiving area of a vehicle, the method comprising:
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a) providing a nonwoven acoustic insulating laminate, wherein the laminate comprises at least one nonwoven web which has been treated so that it has a surface energy less than about 34 dynes/cm2, and at least a layer of fibrous material or open cell foam, and b) positioning the laminate so that it attenuates sound waves passing from the source area to the receiving area. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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Specification