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Lightweight acoustical system

a technology of acoustic systems and acoustic barriers, applied in the field of acoustic systems, can solve the problems of rusting floor pans, moldy and odor formation in the underpads, etc., and achieve the effect of improving the acoustic barrier

Inactive Publication Date: 2006-03-14
INT AUTOMOTIVE COMPONENTS GRP NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]Accordingly, it is an object of the present invention to provide an improved acoustical system which functions sufficiently over a broad frequency range. Another object of the present invention is to provide an improved acoustical barrier which is not susceptible to water intrusion.

Problems solved by technology

Furthermore, a porous surface may cause several practical problems.
When used on the floor of a motor vehicle, an acoustical absorber having a water-permeable facing is susceptible to water intrusion which may cause formation of mildew and odor in the underpad, as well as rust the floor pan in some cases.

Method used

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  • Lightweight acoustical system
  • Lightweight acoustical system

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Embodiment Construction

[0007]With reference to the drawing, the preferred embodiments of the present invention will be described. FIG. 1 shows a system 10 for inhibiting noise in a motor vehicle. The system 10 comprises a water-impermeable, relatively lightweight layer 12 and an underlayment 14.

[0008]The underlayment 14 is situated next to the impermeable layer 12, and includes a first or lofty fibrous layer 16 and a second or compressed fibrous layer 18. In a preferred embodiment, both of the layers 16 and 18 contain recycled, non-woven fibers which have been fluffed and combed to create a non-directional matrix or batt. Both layers 16 and 18 preferably have a surface density between about 500 grams per square meter and about 1400 grams per square meter.

[0009]A semi-permeable layer 20, comprising a fusible plastic film or cellulose filter scrim with a heat-settable adhesive, is preferably positioned between the layers 16 and 18 to provide additional airflow resistance and to help bond the layers together...

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Abstract

An improved acoustical system for inhibiting noise in a motor vehicle. The system comprises an impermeable layer and an underlayment adjacent to the impermeable layer. The underlayment includes a first fibrous layer and a second fibrous layer. The underlayment has an airflow resistance between about 2000 and about 5000 mks Rayls.

Description

TECHNICAL FIELD[0001]This invention relates to acoustical systems.BACKGROUND ART[0002]The use of a permeable facing fabric or film on an acoustical absorber to improve its low frequency response has been shown in the literature and in numerous commercial applications, primarily in the building and construction field. Recently this concept has been applied to motor vehicle interior acoustical products. While these arrangements may demonstrate improved sound transmission loss in the mid-frequency range as compared to a double-walled system, they also typically exhibit decreased sound transmission loss at higher frequencies. Furthermore, a porous surface may cause several practical problems. When used on the floor of a motor vehicle, an acoustical absorber having a water-permeable facing is susceptible to water intrusion which may cause formation of mildew and odor in the underpad, as well as rust the floor pan in some cases.DISCLOSURE OF INVENTION[0003]This invention provides an impro...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): E04B1/82B60R13/08G10K11/162G10K11/168
CPCB60R13/083B60R13/0892G10K11/162G10K11/168B32B2323/04B32B5/26B32B27/32B32B27/12B32B2471/02B32B2307/7265B32B2307/10
Inventor GISH, LAURA E.HUANG, LIANGYUEBBITT, GORDONWYERMAN, BARRYBOYLES, DAVID
Owner INT AUTOMOTIVE COMPONENTS GRP NORTH AMERICA INC
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