Steel plate punching sound-absorbing plate color steel plate punching plate board sound-absorbing board ceiling partition the acoustic board 

 Sound-absorbing ceiling acoustic ceiling, acoustic wall 

 The sound absorbing ceiling and ceiling of one of the absorbing structure, with the overall sense, the characteristics of beautiful appearance, wide absorption band, especially the large cavity between the sound-absorbing ceiling and roof are ideal low-frequency absorption . Sound absorption wall and the wall of one of the absorbing structure, with the overall sense, the appearance of luxury, with a wide absorption band, especially for the performance of low-frequency ambient noise. Metal sound-absorbing perforated plate is a metal coil in accordance with a certain pore size and density, perforation, and then pressed into various shapes of metal materials, mainly used for the roof of the movie theaters, stadiums, libraries require a higher place on silencers backplane. My company can according to customer's sound-absorbing customize a variety of pore size and density of sound-absorbing perforated plate. 

 The sound absorption is the sonic impact to the phenomenon of energy loss in the surface of the sound-absorbing material. The color plate the punching Banban sound-absorbing board sound absorption can reduce indoor sound pressure level, but can also reduce noise pollution. Description of the indicators of sound absorption is the absorption coefficient a, on behalf of absorption of sound energy of incident sound energy ratio. In theory, a sound-absorbing material is completely reflective sound, a = 0; a sound-absorbing material of the incident sound can all be absorbed, then its a = 1. In fact, all the sound-absorbing material in a range of between 0 and 1, that is not all reflection, they can not absorb all the. Different frequencies have different absorption coefficient people to use the absorption coefficient frequency characteristic curves describe the sound absorption properties of materials at different frequencies. In accordance with ISO standards and national standards, the absorption coefficient of sound absorption test reports the frequency range is 100-5KHz. 100-5KHz absorption coefficient of the average value is the average absorption coefficient, the average absorption coefficient reflects the sound absorption properties of the material overall. 
 In engineering often use the noise reduction coefficient NRC roughly the sound absorption performance evaluation in the language in the frequency range, this value is material in 250,500,1 K, 2K four frequency absorption coefficient is the arithmetic mean, rounded rounded to 0.05. Is generally believed that the NRC is less than 0.2 of the material is a reflective material, the NRC materials greater than 0.4 are considered to be sound-absorbing material. When the need to absorb large amounts of sound energy to reduce room reverberation and noise, and often recommend the use of the high absorption coefficient of the material. The centrifugal glass wool is high NRC sound absorption material 5cm thick 24kg / m 3 centrifugal glass wool NRC 0.90. 
 All products of the steel plate punching sound-absorbing board porous sound-absorbing material such as centrifugal glass wool, rock wool, mineral wool, plant fiber, such as spraying, sound absorption of the material within a large number of tiny pores in depth, sound waves along these pores inside the material. friction material will sound energy into heat. Ceiling cut off the sound-absorbing board 

 The sound absorption characteristics of porous sound-absorbing material is gradually increasing absorption coefficient with increasing frequency, which means that low-frequency absorption of high-frequency absorption. 
 Existence of the air layer all products perforated walls or ceilings, sound absorption properties of the material itself is poor, this structure also has a sound absorption performance, such as perforated gypsum board wood, metal plates, and even slit brick, etc., it the sound absorption of a Helmholtz resonator and acoustic board ceiling partition 

 Dramatic resonance effect between the air and the interior space of the neck like a thermos bottle, the external space and internal space through a narrow bottleneck connection, the sound waves incident on the resonant frequency and the loss of acoustic energy. The Helmholtz resonance absorption feature is only in certain frequency has a larger absorption coefficient. Film or sheet structure formation of the cavity can sound absorption, such as wood, metal plate, the sound absorption mechanism of this structure is a sheet resonance, the resonance frequency due to sheet severe vibration absorbs sound energy. Sheet resonance absorption mostly in the low frequency has good sound absorption properties.