双层复合非织造材料基吸声体吸声性能研究

以熔喷丙纶非织造材料和玻璃纤维水刺非织造材料为受声面和背衬层,通过热粘合方式制成双层复合非织造材料基吸声体。通过分析吸声体受声面和背衬层非织造材料的厚度、面密度、孔径、孔隙率等结构参数与复合吸声体的吸声系数之间的关系,探讨各层非织造材料结构参数对复合吸声体吸声性能的影响。实验结果表明,随着熔喷丙纶非织造材料和玻璃纤维水刺非织造材料厚度和面密度的增加,吸声体中高频段吸声系数显著提高;受声面和背衬层的孔径尺寸和孔隙率的变化对双层复合非织造材料基吸声体的吸声性能影响较为显著。

Acoustic research of dual-layered nonwoven absorbers

Dual-layered nonwoven absorbers are manufactured by thermally bonding the melt blown polypropylene nonwoven and hydroentangled glass fiber nonwoven that are used as sound reception layer and backing layer, respectively. The effect of the structure parameters of sound reception layer and backing layer on the sound absorption coefficient of absorber is explored by analyzing the relationships between thickness, area density, pore size, porosity and sound absorption coefficient. Experiment results indicate that the sound absorption coefficient of nonwoven absorber increases significantly with the increase of the thickness and area density of melt blown polypropylene nonwoven and hydroentangled glass fiber nonwoven. Additionally, the pore size and porosity of sound reception layer and backing layer are distinct impact factors of sound absorption coefficient of dual-layered nonwoven absorber.