When the fiber has a thinner thickness, more fibers may be put in, and as a result, a porosity of the fiber layer may be increased to improve noise absorption performance.

Therefore, performance of a fiber-based noise absorbing material may depend on a thickness of the fibers included in the fiber layer, area density and thickness of the fiber layer, and the like. When a sound wave is incident into a fiber layer, the fiber layer used as the noise absorbing material may convert sound wave energy into heat energy by a vibration damping phenomenon which is caused by viscous air resistivity and a viscoelastic characteristic of fibers included in the fiber layer, and thus the noise may be finally reduced. This noise absorbing material is configured to absorb noise in a process in which sound wave energy is converted into heat energy by motion. Especially in the vehicle, the noise absorbing material is installed on a dash panel which separates an engine room and a vehicle room from each other in order to block noise occurring in the engine room, or installed on a floor panel in order to block noise transferred from a floor of the vehicle. Noise absorbing materials are commonly used in vehicles, studios, theaters and the like. BACKGROUND OF THE DISCLOSURE Field of the DisclosureĮxemplary embodiments in the present disclosure relate to a lightweight noise absorbing material and a substrate having the same attached thereto, and more particularly, to a lightweight noise absorbing material providing lightweight and excellent noise absorption performance compared to existing noise absorbing materials by including a triple thin fiber layer in which fine fiber layers are stacked respectively on upper and lower surfaces of a fibrous non-woven fabric, and a substrate having the lightweight noise absorbing material attached thereto. 25, 2018, the disclosure of which is incorporated herein by reference in its entirety. This application claims priority to Korean Patent Application No.

Lightwright noise