Figure 1 shows the test results of the sound absorption coefficient of two-component sound-absorbing cotton materials with different thickness (5mm, 10mm, 18mm, 23mm, 24mm) and gram weight (100g/m2, 200g/m2, 300g/m2, 400g/m2, and 420g/m2).

Figure 1 characteristic curve of sound absorption coefficient of different thickness and weight materials

From figure 1, 5 kinds of different thickness and gram sound-absorbing performance curve into a parabolic, shows that with the increase of material thickness and gram weight, sound-absorbing performance is increasing, which is 24 mm in thickness, g to 420 g/m2 of intermediate frequency coefficient of acoustic absorption peak, at high frequencies, 5 kinds of models are showed obvious and stable sound-absorbing performance, by the 2000 Hz after high frequency band, a steady trend, it shows that the structure of two-component sound-absorbing cotton material showed a good sound absorption performance at high frequencies.

Figure 2 shows the test results of the sound insulation performance of the two-component sound-absorbing cotton materials with different thickness and weight.

Figure 2 acoustic insulation characteristics curves of materials of different thickness and weight

From figure 2 shows, with the increase of thickness, sound insulation performance at low frequencies, the overall still showed increasing trend, but an undulating sound insulation performance curve is obvious, especially in the high frequency of 3150 hz, near a large trough, shows a two-component sound-absorbing cotton material at this point the sound insulation performance is poorer, show the sound insulation performance curve in high frequency phase value also is not so stable, proof of multicomponent sound-absorbing cotton material sound-absorbing noise reduction performance at a particular frequency of sound insulation performance is enhanced with the increase of the thickness of the, but in thickness exceeds a certain threshold, sound-absorbing noise reduction performance will be weakened with the increase of the thickness. Generally speaking, the sound insulation performance of two-component sound-absorbing cotton has a certain relationship with thickness and gram weight. In the case of the same structure, it is superior in thickness and weight.