多层复合熔喷非织造布的制备及其隔音性能研究

为探讨多层复合熔喷非织造布的隔音性能,以热轧方式制备了13种6层复合熔喷非织造布,对应的单层熔喷非织造布是由计量泵频率、网帘频率和接收距离3个工艺参数的不同组合制备而成。以透射损失来表征材料的隔音性能,并对上述复合熔喷非织造布进行隔音性能测试。结果显示:透射损失与声频成函数关系,在低频段透射损失随着频率升高而降低;中频段时透射损失波动较大,当频率接近630 Hz时达到最低值;在高频段透射损失随频率的升高而增大,当频率为10000 Hz左右时达到最高值。随计量泵频率的变化,试样的透射损失没有呈现明显的提高或下降趋势;网帘频率增大使得试样的透射损失有明显下降;随着接收距离的增大,试样的透射损失呈小幅下降的趋势。

Preparation and Sound Insulation of Multilayer Composite Meltblown Nonwovens

In order to investigate the sound insulation performance of multilayer composite meltblown nonwovens,thirteen 6-layers composite meltblown nonwovens were prepared using the calendering method.The corresponding single-layer meltblown nonwovens were produced by combining metering pump frequency,mesh belt frequency and the distance from die to collector in different ways.The sound insulation performance is characterized by transmission loss,and the above composite meltblown nonwovens were tested in this way.The results show that the transmission loss is the function of audio frequency.Transmission loss decreases with the increase of frequency in the low-frequency band.In addition,it fluctuates acutely in the middle-frequency band and reaches its lowest point as the frequency approaches 630 Hz.Furthermore,transmission loss grows with the increase of frequency in the high-frequency band and reaches its highest point when the frequency is about 10000 Hz.When the metering pump frequency changes,the transmission loss does not show a significant increase or decrease trend.The increase in mesh belt frequency makes the transmission loss decline significantly.With the increase of the distance from die to collector,the transmission loss shows a slightly downward trend.