8cm what is the sound volume of the soundproof cotton?
Restate the professional point of view, the sound-absorbing material as insulation, sound-absorbing insulation materials or when used is not scientific. In both sound and sound (such as the design of reverberation time) when the need to use composite insulation board and sound-absorbing materials, can not only ensure the system sound transmission coefficient is small, and ensure the sound reflection weakened reach, sound insulation and sound absorption cream effect.
You said if you want to use 8cm cotton insulation wall system to suppress the noise effect, must be added on both sides of the insulation cotton high density (or surface density) of the building materials, such as gypsum board, glass magnesium board, calcium silicate board, fiber cement board and so on. If we want to ensure that the partition wall should not be too thick, and to ensure the sound transmission loss of more than 50dB, it is not up to use the common plate, must use the Chong Ning insulation board and other professional sound insulation board, can achieve the wall thickness in the case of 100~130mm Rw, the weighted sound insulation amount reached more than 50~54dB, and the highest standards of sound insulation value reached the national standard of civil building insulation standards.
Because of the so-called insulation cotton when used alone is actually does not have the sound insulation function, because the so-called cotton insulation such as rock wool, mineral wool, glass wool and other characteristics are fluffy texture or fiber porous, and this kind of material is not sound barrier penetration, but can play a very good sound absorption effect weakens the acoustic reflection.But only on the insulation, the material must be able to reflect the acoustic absorption and consumption, thereby reducing the sound transmission coefficient, which passes through the material transfer to another space energy greatly weakened, and thus play a sound effect.
