The sound absorbing material focuses on the amount of reflected sound energy on the side of the sound source, and thetarget is that the reflected sound energy is small. The sound-insulating material focuses on the amount of transmitted acoustic energy on the other sideof the incident source, with the goal of transmitting less acoustic energy. The absorption and absorption of the incident sound energy by the sound absorbing material is generally only a few tenths. Therefore, the sound absorbingability, that is, the sound consumption coefficient can be expressed by adecimal number; and the sound insulating material can attenuate the transmitted sound energy to 3/10 to 4/ of the incident sound energy. 10 or less, for easeof expression, the amount of sound insulation is expressed in decibels.

For sound-insulating materials(China SS Nonwovens Manufacturer), to weaken the transmitted sound energy and block the sound transmission, it cannot be asporous, loose and breathable as the sound-absorbing material; instead, its material should be heavy and dense, such as lead plates and steel plates. The material of the soundproof material is dense and has no pores or gaps; it has a large weight. Since such a sound insulating material is dense, it is difficult toabsorb and transmit sound energy and the reflection energy is strong, so itssound absorption performance is poor.

The difference in material between the two materials is that the sound absorbing material(Polypropylene Spunbond Nonwovens Factory) has little reflection on theincident sound energy, which means that the sound energy can easily enter andpenetrate the material; it is conceivable that the material of the material should be porous, loose and breathable. This is a typical porous sound absorbing material, which is usually made of a fibrous, granular or foamed material to form a porous structure; its structural feature is that thematerial has a large number of interpenetrating, The micropores from the insideto the inside have a certain gas permeability. When sound waves are incident onthe surface of the porous material, the air in the micropores is caused tovibrate. Due to the frictional resistance and the viscous resistance of the airand the heat conduction, a considerable part of the acoustic energy is converted into heat energy, thereby functioning as a sound absorbing.