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The Difference Between Sound Insulation Board and Sound Absorption Board

Mar. 28, 2020

Sound insulation refers to the isolation, partitioning, separation, etc. of sound or noise by certain objects, so a Rock Wool Pipe composite sound-absorbing board is required. Acoustic board refers to the material that can isolate, cut off and separate sound or noise and vibration sound. Because many places in people's lives have a certain degree of noise that affects their normal lives, it is necessary to have sound-absorbing panels to maintain people's normal lives. There are many types of sound-absorbing panels, and common ones are: building sound-absorbing panels, KTV sound-absorbing panels, decoration sound-absorbing panels, sound-absorbing and vibration-damping materials, shock-absorbing materials, decorative sound-absorbing panels, decorative sound-absorbing cotton, sound-proof panels, sound-proof and fire-proof materials . All materials that can be used to block noise are collectively referred to as sound-absorbing panels. There are many kinds of sound-absorbing panels. Everyday people commonly see solid bricks, reinforced concrete walls, wood blocks, gypsum boards, iron plates, sound insulation felts, Mineral Fiber Acoustic Ceiling and so on. Strictly speaking, almost all materials have sound insulation. The difference is that the volume of different materials is different. Due to the different surface density of the same material, there is a relatively large change in its sound insulation.

Mineral Fiber Acoustic Ceiling

Mineral Fiber Acoustic Ceiling

The sound insulation volume follows the principle of quality law, that is, the larger the unit dense area density of the sound absorbing panel, the larger the sound insulation volume, and the area density is proportional to the sound insulation volume.

The sound absorbing board is physically flexible, and when sound waves are incident, the vibration is excited to propagate in the interlayer. When the sound wave is not incident perpendicularly, but at an angle θ with the interlayer, the acoustic wave front reaches the surface of the interlayer in turn, and the acoustic wave that arrives in the interlayer first stimulates the bending vibration wave in the interlayer to propagate transversely along the interlayer. When the propagation speed is consistent with the traveling speed of the sound wave in the air that gradually reaches the surface of the compartment, the sound wave strengthens the vibration of the bending wave. This phenomenon is called the coincidence effect. At this time, the amplitude of the bending wave vibration is particularly large, and the energy of the sound absorbing plate wave radiated to the other side of the air is also particularly large, thereby reducing the sound insulation effect. The sound field in most rooms is close to the reverberant sound field, and the incident angle to the compartment is possible from 0 ° to 90 °, which means that the anastomosis effect makes the sound insulation effect in a certain frequency range worse. Generally this frequency range occurs at mid-high frequencies. From the law of mass, it is known that the amount of sound insulation in the middle and high frequencies is large. Except for the metal plate with small internal damping, the phenomenon that the sound insulation is reduced due to the anastomosis effect will not cause much trouble.

Difference between Sound Absorption Ceilling Board and sound insulation board:

When sound waves are incident on the surface of a material, part of the incident sound energy is reflected, another part enters the interior of the material and is absorbed, and another part passes through the material and enters the other side of the material.

When most of the sound energy enters the material (being absorbed and transmitted) and the reflected energy is very small, it indicates that the material has good sound absorption performance. When the sound absorption coefficient is greater than 0.2, it can be called a sound absorption material.

The use of materials or components to isolate or block the transmission of sound to achieve a quiet environment is called sound insulation. When sound is incident on the surface of the material, the transmitted sound energy through the material to the other side is very small, indicating that the material has strong sound insulation. The decibel number of the difference between the incident sound energy and the transmitted sound absorption panel on the other side is the sound insulation of the material.

It can be seen from the above description: the sound absorption of the material focuses on the size of the reflected sound energy on one side of the sound source, and the goal is to reduce the reflected sound energy; The goal is to transmit less acoustic energy.

Applications: TV stations, cinemas, opera houses, concert halls, conference centers, gymnasiums, audio studios, homes, shopping malls, hotels, karaoke, lounges, restaurants, etc.

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