The shape of the sound absorbing panel of the elevator shaft is concave and convex. This special structure increases the effective sound absorption area and at the same time changes the reflection effect of the sound. The noise reduction coefficient NRC=0.75 is suitable for elevator shaft, elevator machine room, air conditioner room, etc. Sound absorption and noise reduction processing in a class-specific structure.
Elevator well sound absorbing panel product description?
The elevator shaft sound absorbing panel is specially designed for the elevator shaft and the machine room. The core material is yellow glass wool fiber. The centrifugal glass wool is an acoustic material widely used in the world for a long time. It has been proved to have excellent sound absorption. Performance, and excellent fire performance, the surface of the composite sound absorption particles. The main function is to enhance the sound absorption effect and make it easier to install. The shape of the sound absorbing panel of the elevator shaft is concave and convex. This special structure increases the effective sound absorption area and changes the reflection effect of the sound. The noise reduction coefficient NRC=0.75 is mainly applied to the elevator shaft, elevator machine room, air conditioner room, etc. Sound absorption and noise reduction treatment in various specific structures. And it is non-toxic and harmless, and it is a real green sound-absorbing decorative board.
The internal fibers of the sound-absorbing cotton in the elevator shaft are fluffy and interlaced, and there are a lot of tiny pores. It is a typical porous sound absorbing material with good sound absorption characteristics. Centrifugal glass wool can be made into wallboard, ceiling, space sound absorber, etc. It can absorb the sound energy in the room in a large amount, reduce the reverberation time and reduce the indoor noise.
The sound absorption performance of the sound absorption cotton of the elevator shaft is also closely related to the installation conditions. When there is an air layer behind the sound-absorbing cotton board of the elevator shaft, the sound absorption effect of the sound-absorbing cotton of the elevator shaft with the same thickness and no air layer is similar. In particular, the sound absorption performance of the middle and low frequency is much higher than that of the material on the hard bottom surface, and the sound absorption coefficient will increase as the thickness of the air layer increases, but the effect is not obvious after increasing to a certain value. The use of glass wool stacks of different bulk densities together to form a form of increasing bulk density allows for greater sound absorption. For example, a sound absorption effect of a 2.5 cm thick 24 kg/m3 cotton board and a 2.5 cm thick 32 kg/m3 cotton board is better than a 5 cm thick 32 kg/m3 cotton board. It is usually used in large spaces such as public gymnasiums, KTW halls, workshops, etc., in order to absorb sound and reduce noise, it is the main material for sound absorption of sound absorption cotton in elevator shafts.
Sound absorption coefficient of sound absorbing panel material, according to GB/T20247-2006 ISO 354:2003 "Acoustic reverberation chamber sound absorption measurement"
The noise reduction coefficient: NRC=0.85, and the suction performance of the sound absorbing structure is one level. (NBR ≥ 0.85)
Frequency / HZ | 100 | 125 | 160 | 200 | 250 | 315 | 400 | 500 | 630 | a | NBR |
Sound absorption coefficient | 0.38 | 0.48 | 0.51 | 0.84 | 0.86 | 0.82 | 0.92 | 0.87 | 0.80 | 0.77 | 0.85 |
Frequency / HZ | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | 3150 | 4000 | 5000 | a | NBR |
Sound absorption coefficient | 0.81 | 0.80 | 0.76 | 0.86 | 0.87 | 0.87 | 0.85 | 0.80 | 0.76 | 0.77 | 0.85 |
A1 is the average sound absorption coefficient of 100-5000HZ.
A2, NBR is the noise reduction coefficient, which is the arithmetic mean of the sound absorption coefficients of four octave bands of 250, 500, 1000, 2000HZ.
Elevator well sound-absorbing cotton is a porous sound absorbing material with good sound absorption performance. The reason why centrifugal glass wool can absorb sound is not because of the rough surface, but because of the large number of tiny pores and pores that communicate inside and outside. When sound waves are incident on the centrifugal glass wool, sound waves can enter the inside of the material along the pores, causing vibration of air molecules in the gap. Due to the viscous resistance of the air and the friction between the air molecules and the pore walls, the acoustic energy is converted into heat energy and lost.
Hebei Desuman Insulation Materials Co., Ltd.
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