Sound-insulating laminated structure and method for the production thereof

Abstract

Herein provided is a sound-insulating laminated structure which is excellent in the ability of insulating low frequency sounds whose frequency falls within the range of from 200 to 1000 Hz. The sound-insulating laminated structure comprises a first glass wool layer, a metal foil layer free of any opening and a second glass wool layer. The first and second glass wool layers are ones each prepared by collecting and combining short glass fibers through the application of an uncured thermosetting phenol resin to the short glass fibers to thus give a web of glass wool prepreg and then molding, with heating, the web into a sound-insulating laminated structure having a desired shape.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 12 / 521,203, filed Jun. 25, 2009, which was the National Stage filing under §371 of PCT / JP2007 / 072271, filed Nov. 16, 2007, which claims priority to Japanese Patent Application No. 2007-007658, filed Jan. 17, 2007, the entire content of each of which is incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a sound-insulating laminated structure having an excellent ability of insulating or absorbing low frequency sounds.TECHNICAL BACKGROUND ART[0003]There has conventionally been used glass wool, for instance, around the engines of automobiles in order to insulate noises from the engines or the like. Such glass wool used therein has been produced by applying an uncured thermosetting resin to spun short glass fibers, collecting and combining the short glass fibers to thus give a web and then pressure-molding the resulting web with heating. ...

AI Technical Summary

Benefits of technology

[0030]The structure of the present invention is formed from a glass wool layer and a metal foil and therefore, the structure can provide a sound-insulating laminated structure excellent in the heat resistance, and likewise excellent in the ability of insulating low frequency sounds having a frequency ranging from 200 to 1000 Hz without unreasonably increasing the thickness thereof. Accordingly, the structure of the present invention can effectively be used as not only the sound-insulating material for the construction such as houses and buildings, but also as the sound-insulating material used around, for instance, the motors and engines of compressors, railway vehicles and automobiles, in particular, around the motors and engines of automobiles.

Problems solved by technology

However, it is difficult that the aforementioned glass wool formed by pressure-molding with heating would insulate the sounds whose frequency falls within the range specified above and accordingly, there has been desired for the development of a novel sound-insulating material.

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