ACOUSTIC INSULATION - TOYO BOSEKI

Title:

ACOUSTIC INSULATION

Document Type and Number:

WIPO Patent Application WO/2006/013810

Kind Code:

A1

Abstract:

[PROBLEMS] To provide an acoustic insulation that despite being lightweight and thin, excels in sound absorbency even within a low frequency region. [MEANS FOR SOLVING PROBLEMS] Use is made of an acoustic insulation of 5 to 30 mm thickness wherein there is at least one peak of normal incident sound absorption coefficient within the zone of 315 to 5000 Hz, the peak sound absorption coefficient being ≥ 80%. For example, setting of the sound absorption coefficient peak can be accomplished by effecting combining and integration, by means of through-passing multiple fibers, of a layer consisting of nonwoven fabric (A) of 10 to 70 g/m² per-square-meter weight composed mainly of fibers of 1 to 25 μm diameter laminated with porous film layer (B) of a resin of ≥ 120&ring C melting point with staple fiber nonwoven fabric (C) of 7 to 50 μm diameter, 50 to 2000 g/m² per-square-meter weight and 4 to 30 mm thickness.

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Inventors:

TANAKA SHIGEKI (JP)
SAKAMOTO HIROYUKI (JP)
SAKAGUCHI HIROYASU (JP)

Application Number:

PCT/JP2005/014018

Publication Date:

February 09, 2006

Filing Date:

August 01, 2005

Export Citation:

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Assignee:

TOYO BOSEKI (JP)
TANAKA SHIGEKI (JP)
SAKAMOTO HIROYUKI (JP)
SAKAGUCHI HIROYASU (JP)

International Classes:

B32B5/26; G10K11/16; B60R13/08; E04B1/90

Foreign References:

JP2004021037A	2004-01-22
JPH11309798A	1999-11-09

Other References: