Acoustic insulation

Abstract

Provided is a sound absorbing material having a light weight, a smaller thickness, and outstanding sound absorbing property and heat insulating property. Used is a sound absorbing and heat insulating material having at least one peak of normal incident sound absorption coefficient in a range of 315 to 5000 Hz, a peak absorption coefficient not less than 80%, and a thickness of 5 to 30 mm. For example, a layer obtained by laminating a porous film layer B including a resin having a melting point not less than 120 degrees C to a nonwoven fabric A having a fiber with not less than 1 micron and not more than 25 microns of a fiber diameter, as a principal component, and a mass per unit area of 10 to 70 g / m 2 ; and a staple fiber nonwoven fabric C having a fiber diameter of 7 to 50 microns, a mass per unit area of 50 to 2000 g / m 2 , and a thickness of 4 to 30 mm; are integrated by compounding by a plurality of through-passing fibers, and thereby enabling set of a peak of a sound absorption coefficient.

Description

technical field [0001] The present invention relates to a sound-absorbing material having excellent sound-absorbing properties and heat-insulating properties despite being lightweight and thin. In more detail, it is related with the sound absorbing material excellent in the sound absorption characteristic of 500 Hz - 4000 Hz. Furthermore, it relates to a sound-absorbing and heat-insulating material that is used as interior materials such as ceilings, floors, and door trims of vehicles such as automobiles, and exhibits particularly excellent sound-absorbing properties and heat-insulating properties. Background technique [0002] Conventionally, short-fiber non-woven fabrics have been widely used as sound-absorbing materials for automobiles and construction applications. In order to ensure higher sound-absorbing performance, methods of reducing the fiber diameter to increase air passage resistance, Or research on methods such as increasing the weight per unit area. Moreover,...

AI Technical Summary

Problems solved by technology

However, these nonwoven fabrics have the following problems: they lack a sense of volume and are hard to the touch, so their uses are limited.

However, sound-absorbing materials incorporated into automobile interior materials or electric appliances are rarely subjected to three-dimensional molding operations, but there is a problem that if the drawing is deep during molding, the deformation in the drawn part is large, and it cannot be followed. Deformation of sound-absorbing materials, resulting in fracture

[0007] Under the current situation, it is not possible to obtain a sound-absorbing material that satisfies the market demand, has high sound-absorbing performance in the low-frequency region, and is thin and lightweight with good shape stability.

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