Sound-absorbing material with excellent sound-absorbing performance and method for manufacturing thereof

Abstract

The present invention provides a sound-absorbing material with excellent sound-absorbing performance and a method for manufacturing thereof. More particularly, it relates to a sound-absorbing material, which can improve sound absorption coefficient and transmission loss by forming large surface area and air layer, so as to induce viscosity loss of incident sound energy, may make light-weight design possible because it can express excellent sound-absorbing performance even using reduced amount of fiber, and can improve sound-absorbing performance by using binder fiber having rebound resilience, so as to maintain enough strength between fiber and also to maximize viscosity loss of sound energy transmitted to fiber structure; and a method for manufacturing thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a National Phase application filed under 35 USC 371 of PCT International Application PCT / KR13 / 008630 filed Sep. 26, 2013, which claims the benefit of Korean Patent Application No. 10-2012-0108764 filed on Sep. 28, 2012, the entire contents of which are incorporated herein by reference.BACKGROUND[0002](a) Technical Field[0003]The present invention relates to a sound-absorbing material with excellent sound-absorbing performance and a method for manufacturing the same. More particularly, it relates to a sound-absorbing material with excellent sound-absorbing performance, which can be used for blocking inflow of external noise into vehicle interior by being attached as vehicle components or interior and exterior materials of a vehicle body, and can be used in electric devices and the like that use motor parts so as to improve noise insulation performance thereof[0004](b) Background Art[0005]In general, noise introduced into...

AI Technical Summary

Benefits of technology

The present invention provides a sound-absorbing material that improves sound absorption and transmission by creating a large surface area and air layer, which helps to decrease viscosity loss and dissipation route of incident sound energy. This material is designed to be lightweight and effective, using a reduced amount of fiber. Additionally, the material has improved formability and strength between fibers, as well as rebound resilience, which enhances vibration attenuation against sound energy transmitted inside the matrix. The invention has various applications, such as improving noise insulation performance of electric devices and transportation, and a method for manufacturing it is also provided.

Problems solved by technology

Sound-absorbing means that generated sound energy is converted into thermal energy and then dissipated while it is transmitted through internal route of a material, and noise insulation means that generated sound energy is reflected and blocked by a shelter.

However, when such sound-absorbing material is used, noise may be reduced, but there is a problem of deteriorating fuel efficiency by increasing vehicle weight.

However, this method may also have a weakness such that needs surface density of the fiber aggregate may be improved in order to improve the desired NVH performance.

However, when using this conventional binder fiber with the low melting polyester, the fiber aggregate is hardened, and thus there may be a problem that vibration generated by sound wave propagation and transmitted to matrix structure is not fully attenuated, thereby reducing sound absorption coefficient mainly at low frequency region.

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