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Noise isolation sheet

a technology of noise isolation and noise, which is applied in the field of noise isolation sheets, can solve the problems of not satisfying the requirements of absorbing noise near 1000 hz, and the noise absorbing material disclosed in the japanese patent publication no. 2503215 is not satisfying either in absorbing noise, so as to improve the noise isolating property of the interior of the vehicle, high effective in isolating noise near 1000, and high effective in isolating noise

Inactive Publication Date: 2006-02-02
NISHIKAWA RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022] Further, the closed-cell foamed layer is also highly effective in the waterproof property, while the open-cell foamed layer is highly effective in the noise isolation property.
[0030] According to the noise isolation sheet in the ninth aspect of the invention, the fibered noise absorbing material in any of the preceding invention is the urethane chip felt or the resin felt, so that it can demonstrate a highly effective noise isolation property, and that it is economical.

Problems solved by technology

Further, the noise absorbing material disclosed in the Unexamined Patent Publication No. 8-146967 is only effective in absorbing the noise in a range of 100 Hz to 300 Hz, and it is not satisfying in absorbing the noise near 1000 Hz.
The noise absorbing material disclosed in the Japanese Patent Publication No. 2503215 is not satisfying either in absorbing the noise near 1000 Hz.

Method used

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Examples

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Embodiment Construction

[0047] A noise isolation sheet 10 according to a first preferred embodiment of the invention will be described referring to FIGS. 1 to 6. FIG. 1 is an exploded perspective view showing the noise isolation sheet 10 in an installation posture. Each of FIGS. 2 to 6 is a sectional view along line I-I in FIG. 1 showing the noise isolation sheet 10.

[0048] Each of those noise isolation sheets 10 is installed between a door inner panel 1 of an automobile and an interior door trim 2 fully (or partially) covering an interior side of the door inner panel 1. The noise isolation sheet 10 is comprised of a closed-cell foamed layer 11, an open-cell foamed layer 12 and a fibered noise absorbing material 13.

[0049] The closed-cell foamed layer 11 and the open-cell foamed layer 12 can be made of a synthetic rubber such as EPDM, CR, SBR and NBR, and in this preferred embodiment, they are made of EPDM for a reason that it is easily controlled in its gravity. The fibered noise absorbing material 13 is ...

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Abstract

There is provided a noise isolation sheet 10 which is comprised of an optional number of closed-cell foamed layer 11, open-cell foamed layer 12 and fibered noise absorbing material 13, being laminated in an optional order, and which insulates the noise near 1000 Hz. Further, there is provided a noise isolation sheet 10 comprised of an optional number of the closed-cell foamed layer 11 and the fibered noise absorbing material 13 being laminated in an optional order. There is also provided a noise isolation sheet 10 comprised of an optional number of the open-cell foamed layer 12 and the fibered noise absorbing material 13 being laminated in an optional order. Each noise isolation sheet 10 is used to partially or fully cover an interior side of a door inner panel of a vehicle.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to a noise isolation sheet which is used, for example, as a sheet installed to an interior side of an automobile door. [0002] There have conventionally been applied various noise isolation means to an inner side of an automobile door with an aim of preventing external noise from invading into an interior of the automobile as well as preventing internal noise from leaking to an outside. For example, there have been invented such means that a felt or urethane is attached to a backside of an interior door trim which is installed to an interior side of a door inner panel, and that an urethane made product is attached to a door inner panel. [0003] Regarding to the prior art described above, the applicant of this invention has invented a noise isolation sheet and filed it (Japanese Patent Publication No. 2004-020415) in order to improve a noise isolation property of the conventional noise isolation means. As illustrated in FIG. 15,...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04B1/82E04B1/84E04B2/02B32B5/24B32B5/32B60R13/08G10K11/168
CPCB32B5/24B32B5/32B32B2305/022G10K11/168B32B2307/102B32B2605/08B60R13/0815B32B2305/20B32B5/22B32B33/00B32B2307/10B32B5/245B32B2266/06B32B2266/08B32B5/18
Inventor KOHARA, YOSHIHIROSUZAKI, YASUYOSHIEMORI, SHINICHIRO
Owner NISHIKAWA RUBBER
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