What raw material is the sound-absorbing material

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 Fiber porous materials, such as polyester fiber sound-absorbing cotton (cotton insulation), wave
absorbing sponge, Pyramid absorbing sponge, absorbing material has a large number of internal
mechanism is small connected pores, these pores can penetrate into the acoustic wave along the
sound-absorbing material, and sound-absorbing material occurs friction energy will be transformed
into heat. The absorption property of porous sound-absorbing material is gradually increased with
the increase of sound absorption coefficient frequency, which means that the low frequency
absorption of high frequency absorption is not good.
Undefined
The necessary conditions of porous sound-absorbing material: material has a large number of gaps,
the gap between the internal pore materials deeply connected with each other. One of the mistakes
is that the surface roughness of the material has a sound absorbing performance, in fact, for
example, stucco surface concave convex stone does not have the basic ability of sound absorption.
The two is that the wrong understanding of material has a large number of internal holes of
materials, such as polystyrene, polyethylene, obturator polyurethane, sound-absorbing performance
is good, in fact, these materials due to internal holes no connectivity, not deep inside the
material acoustic vibration friction, so the sound absorption coefficient is very small.
This will remind you not to mistakenly believe that the material has a large number of gaps or a
large number of empty holes can play the effect of absorption done otherwise a soundproof treatment
had no effect but also remove trouble..






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Tags: sound-absorbing material