Automotive sound-absorbing material

a technology for automotive sound absorption and sound insulation, which is applied in the direction of flooring, transportation and packaging, walls, etc., can solve the problems of partial unevenness of the basis weight of the felt, difficult to give uniform air permeability throughout the entire surface of the felt, and inferior sound absorption properties, etc., to achieve superior sound absorption and keep the interior of the automobile quiet

Inactive Publication Date: 2009-10-08
HOWA TEXTILE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The automotive sound-absorbing material of the present disclosure is light-weight and thin, and since sound permeates the film and is absorbed uniformly by the entire surface of both sound-absorbing laye

Problems solved by technology

While felt excels in sound-absorbing property, it has inferior sound-insulating property.
It was however difficult to give uniform air permeability throughout the entire surface of the felt, since the control of air permeability by crushing the felt resulted in the partial unevenness of the basis weight of the felt.
For example, it is necessary to crush the felt to a thickness of 5 mm to control the air permeability of a felt with a basis weight of 1200 g/m2 to 10 cc/cm2/sec, but the attempt to obtain said air permeability resulted in a notable unevenness of the air permeability in

Method used

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Examples

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example 1

[0023]In this example, felt with a basis weight of 500 g / m2 mainly made of PET fiber of 2 to 6 dtex was used as the sound-absorbing layers (1, 3), and as the intermediate layer (2), a layer obtained by laminating a 20 μ-thick adhesive layer (5) comprising unsaturated polyester to a 20 μ-thick film (4) made of thermoplastic resin comprising polyethylene was used. Small pores with a diameter of 1 mm were formed onto the film (4) made of thermoplastic resin with a pitch of 5 mm, and the obtained pored film was adhered to the felt. The air-permeability of a surface area of 2 m2 of the obtained sound-absorbing material was measured at randomly chosen 10 measurement points. The results are shown in Table 2 in the same manner as in Table 1:

TABLE 2①②③④⑤⑥⑦⑧⑨⑩AV3σ10.810.310.410.311.010.710.310.310.610.310.50.77

[0024]As shown under 3σ in Table 2, the scattering of the air-permeability could be remarkably reduced in the example of the disclosure by adhering pored film to the felt, thereby makin...

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Abstract

A thin and light-weight automotive sound-absorbing material with a superior sound-absorbing property, which can be used, for example, for automotive insulator to keep the interior of an automobile quiet. This automotive sound-absorbing material has a laminate structure comprising a sound-absorbing layer, an intermediate layer, and a sound-absorbing layer. The intermediate layer comprises a film made of thermoplastic resin with a thickness of 10 to 100μ, on which small pores are uniformly opened in such a manner that the aperture ratio would be 0.05 to 5%. The sound-absorbing layers comprise an aggregate of fibers such as felt, glass wool, etc. or porous synthetic resin layer, such as urethane foam, etc.

Description

BACKGROUND[0001]1. Field of the Disclosure[0002]The present disclosure relates to a light-weight and thin automotive sound-absorbing material with a superior sound-absorbing property that can be used, for example, for automotive insulator provided on the floor, etc. of an automobile for keeping the interior of the automobile quiet.[0003]2. Discussion of the Background Art[0004]Light-weight sound-absorbing materials based on felt are in the mainstream of the recent automotive sound-absorbing materials for reason of reducing the weight of the car body. While felt excels in sound-absorbing property, it has inferior sound-insulating property. Felt has therefore been crushed to reduce the air permeability in order to improve the sound-insulating property in the prior art.[0005]It was however difficult to give uniform air permeability throughout the entire surface of the felt, since the control of air permeability by crushing the felt resulted in the partial unevenness of the basis weight...

Claims

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Application Information

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IPC IPC(8): E04B1/82
CPCB60R13/083B60R13/0815
Inventor HAYASAKA, SHINYAFUSHIKI, SHINOBUMIZATA, SHUICHI
Owner HOWA TEXTILE IND
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