Jiuquan Shenzhou centrifugal glass wool price

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Centrifugal glass wool is a porous sound absorption material with good sound absorption performance. The reason why centrifugal glass wool can absorb sound is not because of its rough surface, but because it has a large number of internal and external micro pores and holes. When the sound wave is incident on the centrifugal glass wool, the sound wave can enter the material along the pores, causing the vibration of air molecules in the pores. Due to the viscosity of air The resistance and the friction between air molecules and the pore wall, the sound energy is converted into heat energy and lost. The main factors affecting the sound absorption performance of centrifugal glass wool are thickness, density and air flow resistance. Density is the weight per cubic meter of material. Air flow resistance is the ratio of air pressure and air velocity on both sides of the material per unit thickness.

Air flow resistance is an important factor affecting the sound absorption performance of centrifugal glass wool. The flow resistance is too small, indicating that the material is sparse, air vibration is easy to pass through, and the sound absorption performance is reduced; Too large flow resistance indicates that the material is dense, air vibration is difficult to transmit, and sound absorption performance is also reduced. For centrifugal glass wool, the sound absorption performance has flow resistance.

In practical engineering, it is difficult to measure the air flow resistance, but it can be roughly estimated and controlled by thickness and unit weight.

a、 With the increase of thickness, the sound absorption coefficient at middle and low frequencies increases significantly, but the change at high frequencies is not significant (the absorption at high frequencies is always large).

b、 When the thickness is constant, the unit weight increases, and the sound absorption coefficient at middle and low frequencies also increases; However, when the bulk density increases to a certain extent, the material becomes dense, the flow resistance is greater than the good flow resistance, and the sound absorption coefficient decreases instead. When the unit weight is close to 110kg/m3, the sound absorption performance reaches the maximum value. When the unit weight exceeds 120kg/m3, the sound absorption performance decreases because the material becomes dense and the sound absorption performance at medium and high frequencies is greatly affected,

The sound absorption performance of centrifugal glass wool is also closely related to the installation conditions. When there is an air layer behind the glass wool board, the sound absorption effect is better than that of the glass wool board with the same thickness and no air layer. Especially in The low-frequency sound absorption performance will be greatly improved than that of the material on the hard bottom. The sound absorption coefficient will increase with the increase of the thickness of the air layer, but the effect will not be obvious when it reaches a certain value.

The moisture-proof performance is strict with the project access of the water source protection zone. According to the territorial management principle, strengthen the environmental supervision of the drinking water source protection zone, implement a strict environmental access system, and achieve four "no approval", that is, no approval will be given to the projects with sewage outlets in the drinking water source protection zone; New reconstruction and expansion projects unrelated to water supply facilities and protection of water sources in Grade I protection zones will not be approved; No new reconstruction or expansion projects that discharge pollutants in the secondary protection zone will be approved; New and expansion projects in quasi protected areas that cause serious water pollution will not be approved.