Study on PET/PP scattered composite melt-blown sound-absorbing materials for automobiles

PET/PP and feather fiber/PP scattered composite melt-blown nonwovens were made by scattered composite melt-blown process,respectively.The influences of the thickness and surface density of the material and average diameter of fiber and distribution on the sound-absorbing property of the materials were studied.It is found that the sound absorption coefficient increases with the increase of the thickness.The influence of surface density on the absorption coefficient is not as obvious as the thickness.Increasing the surface density also increases the sound absorption coefficient but with less margin.The variations of average diameter of the melt-blown fibers in the range of 1.7-2.4 μm has insignificant impact on the absorption coefficient.In addition,the sound-absorbing material made by 3M and the conventional waste fiber sound-absorbing material were selected to compare the sound-absorbing property.It indicates that the sound-absorbing coefficient of PET/PP scattered composite melt-blown sound-absorbing material is similar to that of 3M Company′s product but better than those of the conventional waste fiber sound-absorbing material and feather fiber/PP scattered composite melt-blown nonwoven material.